Project Report Piscataquog River Watershed Culvert Prioritization MModel
Piscataquog River Watershed, New Hampshire December 9, 2016
Project Report Piscataquog River Watershed Culvert Prioritization Model
Piscataquog River Watershed, New Hampshire December 9, 2016
Prepared for: Southern New Hampshire Planning Commission 438 Dubuque Street Manchester, NH 03102 www.snhpc.org
Prepared by: MILONE & MACBROOM, INC. 1 South Main Street Waterbury, VT 05677 (802)‐882‐8335 www.miloneandmacbroom.com
MMI #4040‐02
Copyright 2016 Milone & MacBroom, Inc. CULVERT PRIORITIZATION MODEL DECEMBER 2016 PISCATAQUOG RIVER WATERSHED, NEW HAMPSHIRE PAGE i
ACKNOWLEDGEMENTS
This project was funded by the New Hampshire Department of Transportation and administered by the Southern New Hampshire Planning Commission. We thank the project technical advisory committee for their thoughtful guidance and reviews of the model. We also would like to thank the three pilot towns – Francestown, Goffstown, and Weare – for their participation in model development. We thank the following people for their work on this project.
Jamie Pike, Town Administrator, Town of Francestown Adam Jacobs, Director of Public Works, Town of Goffstown Naomi Bolton, Town Administrator, Town of Weare Timothy Mallette, NH Department of Transportation Shane Csiki, NH Geological Survey Cheryl Bondi, NH Geological Survey John Magee, NH Fish & Game Department Melinda Bubier, NH Department of Environmental Services Steve Couture, NH Department of Environmental Services Heather Dunkerley, NH Homeland Security and Emergency Management Colin Lawson, Trout Unlimited Gabe Bolin, Trout Unlimited Dick Ludders, Piscataquog River Local Advisory Committee Peter Steckler, The Nature Conservancy Bette Nowack, Stone Environmental Denise Burchsted, Keene State College Tom Ballestero, University of New Hampshire
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EXECUTIVE SUMMARY
Milone & MacBroom (MMI) and the Southern New Hampshire Planning Commission (SNHPC), with assistance from the New Hampshire Department of Transportation (NHDOT), New Hampshire Department of Environmental Services (NHDES), Trout Unlimited (TU), New Hampshire Geological Survey (NHGS), New Hampshire Division of Homeland Security and Emergency Management, and others have developed a decision‐making screening tool to aid communities in the Piscataquog River Watershed to select priority culvert replacement and stream crossing restorations. The new model draws on existing data and prioritizes culverts for replacement to improve flood resiliency and reconnect aquatic habitat. The model will aid communities in considering funding choices and grant opportunities when replacing priority culverts before they are damaged or washed out in a storm.
The model is a spreadsheet and map screening tool for prioritizing the replacement of culverts based on the following data:
1. GC – How well a culvert matches the stream channel (i.e., geomorphic compatibility); 2. STR – Structural condition and approximate hydraulic capacity; 3. AOP – Aquatic organism passage and habitat reconnection potential; and 4. C – How important the culvert is to the transportation network (i.e., criticality).
The model determines a risk (R) score based on the combination of GC, STR, and C. Structures are ranked and prioritized for replacement by the risk score. For example, if GC, STR, and C are all scored as high; than R is high and the priority level is 1 (highest). The model was developed to have flexible inputs ranging from general state database inputs to local information on specific structures.
The model was developed with input from the state and three pilot towns – Fancestown, Goffstown, and Weare. Maps and lists were provided to the Towns showing them the results of the culvert prioritization. The maps assimilate many data sources into one location to simplify interpretation of results and facilitate decision‐making. The Towns will have access to the model spreadsheet should they choose to track culvert risk and changes electronically. Concept designs were prepared for the highest priority culvert in each of the pilot Towns.
The culvert screening model has many uses for municipalities and state agencies to reduce flood risks and improve the resiliency of the transportation system. Municipalities can plan for a more flood resilient local road network. The model enhances capital improvement planning and budgeting to target high risk locations first. The model can also provide a framework for local asset management. State agencies can use the model to inform the SADES management system. The model can be used to assist ranking and scoring priority replacement project for grant proposals. This model has the potential to serve as a template for the state to evaluate culverts and prioritize replacement of high risk culverts.
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TABLE OF CONTENTS
1.0 INTRODUCTION ...... 1 1.1 Background ...... 1 1.2 Uses and Benefits ...... 1 2.0 Methods ...... 2 2.1 Model Overview ...... 2 2.2 Data Sources ...... 2 2.1 Variables in the Model ...... 3 2.1.1 Geomorphic Compatibility (GC) ...... 4 2.1.2 Structural Condition and Approximate Hydraulic Capacity (STR) ...... 5 2.1.3 Criticality (C) ...... 7 2.1.4 Aquatic Organism Passage (AOP) ...... 8 2.1.5 Risk (R) ...... 10 3.0 RESULTS ...... 12 3.1 Pilot Data Summary ...... 12 3.2 Town Data Summary ...... 12 3.3 GC Score ...... 12 3.4 STR Score ...... 14 3.5 C Score ...... 15 3.6 AOP Score ...... 16 3.7 R Score ...... 17 4.0 DISCUSSION ...... 18 4.1 Model Use ...... 18 4.2 Model Flexibility ...... 19 4.3 Stream Power and Bed Resistance ...... 19 4.4 Local Data Review and Input ...... 19 4.5 Future Implementation ...... 20 5.0 REFERENCES ...... 20 Appendix A: Watershed and Pilot Town Results Summary Appendix B: Deering Appendix C: Dunbarton Appendix D: Francestown Appendix E: Goffstown Appendix F: New Boston Appendix G: Weare Appendix H: Other Towns with Few Assessed Culverts in the Watershed Appendix I: Local Flood Risk Information in the Piscataquog River Watershed
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Appendix J: Concept Designs for High Priority Culverts in Francestown and Goffstown
LIST OF FIGURES
Figure 2‐1: Culvert Scoring System ...... 4 Figure 3‐1: GC Variable Score Distribution ...... 13 Figure 3‐2: GC Data Level Distribution ...... 13 Figure 3‐3: STR Variable Score Distribution ...... 14 Figure 3‐4: STR Data Level Distribution ...... 14 Figure 3‐5: C Variable Score Distribution ...... 15 Figure 3‐6: C Data Level Distribution ...... 15 Figure 3‐7: AOP Variable Score Distribution ...... 16 Figure 3‐8: AOP Data Level Distribution ...... 16 Figure 3‐9: R Screen Score Distribution ...... 17 Figure 3‐10: R Data Level Distribution ...... 17 Figure 3‐11: Risk Level Distribution ...... 18
LIST OF TABLES
Table 2‐2: GC Level 1 Data Scoring ...... 4 Table 2‐3: GC Level 2 Data Scoring ...... 5 Table 2‐4: STR Level 1 Data Scoring (TU and SNHPC, 2012) ...... 6 Table 2‐5: STR Level 2 Data Scoring ...... 6 Table 2‐6: STR Level 3 Data Scoring ...... 7 Table 2‐7: C Level 1 Data Scoring ...... 7 Table 2‐8: C Level 2 Data Scoring ...... 7 Table 2‐9: C Level 3 Data Scoring ...... 8 Table 2‐10: AOP Level 1 Data Scoring ...... 8 Table 2‐11: AOP Level 2 Data Scoring ...... 9 Table 2‐12: AOP Level 3 Data Scoring ...... 10 Table 2‐13: R Scoring and Risk Levels ...... 11
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1.0 INTRODUCTION
1.1 Background
Milone & MacBroom (MMI) and the Southern New Hampshire Planning Commission (SNHPC), with assistance from the New Hampshire Department of Transportation (NHDOT), New Hampshire Department of Environmental Services (NHDES), Trout Unlimited (TU), New Hampshire Geological Survey (NHGS), New Hampshire Division of Homeland Security and Emergency Management, and others have developed a decision‐making screening tool to aid communities in the Piscataquog River Watershed to select priority culvert replacement and stream crossing restorations. This project builds on previous studies and uses previous data in the watershed including culvert inventories, geomorphic compatibility screening, approximate hydraulic modeling analysis, and aquatic organism passage screening.
The new model draws on existing data and prioritizes culverts for replacement to improve flood resiliency and reconnect aquatic habitat. The model will aid communities in considering funding choices and grant opportunities when replacing priority culverts before they are damaged or washed out in a storm.
The model was developed based on a review and analysis of the scientific literature of important processes at crossing structures, existing culvert screening tools for structural geomorphic compatibility and aquatic organism passage, existing design guidelines, and previous work performed by MMI in developing culvert screening methods throughout the region.
This report summarizes the model development; the results of a pilot study in the three towns of Francestown, Goffstown, and Weare; and results for each town in the watershed where assessed culverts exist. A user guide accompanies this report that defines each variable used in the model, describes the model spreadsheet, and provides guidance on how to interpret the results of the model.
1.2 Uses and Benefits
The culvert screening model has many uses for municipalities and state agencies to reduce flood risks and improve the resiliency of the transportation system.
Municipalities o Allows planning for a more flood resilient local road network o Screening and planning tool that informs governing boards and confirms local knowledge and experience o Enhances capital improvement planning and budgeting to target high risk locations first o Provides framework for local asset management o Provides data for hazard mitigation plan updates o Helps secure funding for culvert replacements
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State agencies
o Information for SADES management systems o Assist agencies in ranking and scoring grant proposals o Identify sources of funding for culvert replacement such as Department of Transportation, Fish & Game, Wetlands (aquatic resource mitigation funds); and Department of Safety (FEMA hazard mitigation funding) o Potential template for the state to evaluate culverts and prioritize replacement of high risk culverts
2.0 METHODS
2.1 Model Overview
The Piscataquog River Watershed Culvert Prioritization Model is a spreadsheet and map screening tool for prioritizing the replacement of culverts based on the following data:
5. GC – How well a culvert matches the stream channel (i.e., geomorphic compatibility); 6. STR – Structural condition and approximate hydraulic capacity; 7. AOP – Aquatic organism passage and habitat reconnection potential; and 8. C – How important the culvert is to the transportation network (i.e., criticality).
The model generally runs on the following existing data:
Data Level 1 – State and regional GIS data (e.g., road network lines, traffic count data, proximity to public safety buildings); Data Level 2 – Watershed and regional assessment data and GIS analysis (e.g., structure geomorphic assessment, approximate hydraulic capacity model, amount of habitat reconnected if aquatic organism passage is restored); Data Level 3 – Local data (e.g., poor condition culverts, highly critical culverts).
The model determines a risk (R) score based on the combination of GC, STR, and C. Structures are ranked by the risk score. For example, if GC, STR, and C are all scored as high; than R is high and the priority level is 1 (highest).
The model also calculates a combined data level score based on the scale of data for each culvert (as identified above). The data level score allows the user to know the scale and quality of the date used to score and prioritize each culvert. The data level score is used as a sub‐rank where culverts with a given risk score are prioritized higher with a higher level of data.
The model is a Microsoft Excel spreadsheet called ‘Piscataquog Culvert Screening Tool’.
2.2 Data Sources
Most of the data used in the model exist from prior studies in the watershed or in existing databases.
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The geomorphic compatibility (GC) data describe how a culvert matches the stream channel. GC data sources include:
The width of the structure divided by the width of the bankfull channel expressed as a percent (%); and The results of a stream crossing assessment and inventory with data quality control review performed by NHGS at NHDES that includes assessment dates, location information for each structure (town, road, stream, latitude and longitude), geomorphic and steam characteristics, and the results of the New Hampshire Geomorphic Compatibility Screen (After Schiff et al., 2008);
The structural condition and approximate hydraulic capacity (STR) data describe the assessed condition of the structure and estimate how much flow the culvert can pass through. STR data sources include:
Structural condition as assessed in the field by NHDES, NHGS, and other partners; The Piscataquog River Watershed Stream Crossing Vulnerability Assessment (TU and SNHPC, 2014) that shows how full a culvert is during the 2, 10, 25, 50, and 100‐year floods.
The aquatic organism passage variable (AOP) describes if a fish or other aquatic organism can pass through the culvert. AOP data sources include: The results of the New Hampshire Aquatic Organism Passage Screen conducted by TU and SNHPC (TU and SNHPC, 2012); The results of a GIS habitat fragmentation analysis using the Barrier Assessment Tool (Hornby, 2008; TNC, 2010) to calculate the potential length of habitat made available to species located in the stream network if the barrier was removed. A local ranking of coldwater fish habitat in the Piscataquog River Watershed as identified by NHFG.
The criticality variable (C) describes how important the culvert and road are to the operation of the transportation system. C data sources include: Road highway tier and functional system information provided by NHDOT; Traffic count data from the state; and Local data on culvert and road importance.
2.1 Variables in the Model
Each variable was scored “HIGH”, “MODERATE”, or “LOW” based on the highest level of data available and displayed in a pie‐shaped icon (Figure 2‐1). This flexible approach allows for a model score to be calculated with varying levels / scales of data available. A “HIGH” (red) score indicates a culvert that should be prioritized for replacement based on the given variable, whereas a “LOW” (blue) score indicates a culvert with a lesser
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need for replacement. The variable data level scores were summed to get a combined data level score for each structure. A high data level has a score between 6 and 8 while a low data level has a score between 2 and 4.
Figure 2‐1: Culvert Scoring System
2.1.1 Geomorphic Compatibility (GC)
The GC variable indicates how a culvert matches a stream channel. The Level 1 data scores the culverts hydraulic width as a percent of the streeams bankfull width. A culvert with a hydraulic width less than 75% of the bankfull channel width is scored “HIGH” (red), a culvert with a hydraulic width greater than or equal to 75% and less than 85% is scored “MODERATE” (orange), and a culvert with a hydrauulic width greater than 85% of the streams bankfull width is scored “LOW” (blue) (Table 2‐2).
Table 2‐2: GC Level 1 Data Scoring % of BFW Score Less Than 75% Greater Than 75% and Less Than 85% Greater Than 85%
The Level 2 GC data are the results of the New Hampshire geomorphic compatibility screen as provided by NHGS. Results of “Fully incompatible” and “Mostly incompatible” were scored as “HIGH”, “Partially compatible” scored as “MODERATE”, and “Mostly
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compatible” and “Fully compatible” scored as “LOW” (Table 2‐3). Simplifying the GC score from five to three categories was performed for consistency and ease of interpretation. The GC score is displayed in the upper left quadrant of the display icon.
Table 2‐3: GC Level 2 Data Scoring
2.1.2 Structural Condition and Approximate Hydraulic Capacity (STR)
The STR variable includes an indicator of thee structural condition of a variable from field observations. Each assessed culvert is rated as “New”, “Old”, “Rusted”, “Collapsing”, or “Eroding” (REF: NH DOT). For the Level 1 screen, “New” culverts were scored “LOW”, “Old” culverts were scored “MODERATE”, and “Rusted”, “Collapsing” and “Eroding” culverts were scored “HIGH” (Table 2‐4).
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Table 2‐4: STR Level 1 Data Scoring (TU and SNHPC, 2012)
The Level 2 data combines the structural condition observations with approximate hydraulic capacity (TU and SNHPC, 2014). Culvert capacities were classified as passing (Hw/D < 0.85), transitional (0.85 < Hw/D < 1.0), or failing (Hw/D >1.0) for the modeled 2‐ , 10‐, 25‐, 50‐, and 100‐year floods
Since new structures are generally more resilient to floods than old or damaged structures, scoring for hydraulic capacity was scaled by condition (Table 2‐5).
Table 2‐5: STR Level 2 Data Scoring
NEW CONDITION OLD, RUSTED, COLLAPSING, or ERODING Approximate Hydraulic Capacity Approximate Hydraulic Capacity Flood Pass Transition Fail Flood Pass Transition Fail (RI year) Hw/D<0.85 0.85‐1.15 >1.15 (RI year) Hw/D<0.85 0.85‐1.15 >1.15 2LH H 2 L H H 10 L H H 10 L H H 25 L M H 25 L H H 50 L M M 50 L H H 100 L M M 100 L M H
The Level 3 screen functions as an override based on local information provided by municipalities through NHGS interviews or recent discussions. If a municipality indicates that a culvert is in poor condition, is a known cause of flooding, or is frequently damaged, than it is scored as “HIGH” (red) (Table 2‐6). The STR score is displayed in the upper right quadrant of the display icon.
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Table 2‐6: STR Level 3 Data Scoring
Possible Local Variables Score Known poor condition Known cause of flooding Frequently Damaged NHDOT Redlist Bridge (for culvert with D > 10 feet)
2.1.3 Criticality (C)
The C variable is an indicator of the criticality of a structure, or its importance to a communities’ transportation network. The Level 1 data is the NHDOT Highway Tier at the culvert (Table 2‐7). Interstates, Turnpikes, and Divided Highways (Tier 1), Statewide Corridors (Tier 2), Regional Transportation Corridors (Tier 3) pass over culverts and were scored “HIGH”. Culverts with Local Connectors (Tier 4) and Local Roads identified as minor collectors, major collectors, or minor arterials (Tier 5a) over them were scored “MODERATE”. Culverts carrying all other Local Roads (Tier 5b), Off Network roads (Tier 6) and roads not assigned a Tier were scored “LOW”.
Culverts within a half mile of public safety facilities (police, fire, hospitals, schools), as determined from GIS, were scored “HIGH”. Culverts between 0.5 and 1 mile of public safety facilities were scored “MODERATE”. The proximity to public safety data was used as an override so it replaced road tier scoring when a higher score was identified.
Table 2‐7: C Level 1 Data Scoring NHDOT Highway Tiers Score Total Length (Miles) Percent 0 ‐ Private, Not maintained 132.0 19.7% Tier 1 – Interstates, Turnpikes, and Divided Highways 0.5 0.1% Tier 2 – Statewide Corridors 17.0 2.5% Tier 3 – Regional Transportation Corridors 54.2 8.1% Tier 4 – Local Connectors 8.0 1.2% Tier 5a – Local Roads (All Other*) 46.6 7.0% Tier 5b – Local Roads 411.4 61.4% Tier 6 – Off Network 0.1 0.0% NOTES: Assume that Tier 4 and 5 to be adjusted locally where Towns see as more critical.
Public Safety Proximity Score Within 0.5 mile of public safety (police, fire, hospital, schools) Between 0.5 and 1 mile of public safety
The Level 2 C data scored culverts based on the Average Annual Daily Traffic (AADT) (Table 2‐8). Culverts on roads with greater than 4000 AADT were also scored as “HIGH”. Culverts on roads with 500 to 4000 AADT were scored as “MODERATE”, and culverts with less than 500 AADT were scored “LOW”.
Table 2‐8: C Level 2 Data Scoring Average Annual Daily Traffic (AADT) Score > 4000 trips 500 to 4000 trips < 500 trips
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The Level 3 C data allows municipalities to enter a score of “HIGH” based on local information such as locally important links, culvert is in a floodprone area, and long detours would be required if the culvert washes out (Table 2‐9). The C score is displayed in the bottom right quadrant of the display icon.
Table 2‐9: C Level 3 Data Scoring Possible Local Variables Score Critical links (adjust Tier 4 and 5) Critical structure in floodprone area Near infrastructure High local traffic volume Neighborhoods or Town centers Disruptive Detour
2.1.4 Aquatic Organism Passage (AOP)
The AOP level 1 variable indicates the ability of aquatic organisms to pass through a culvert. The New Hampshire Aquatic Organism Passage Screen rated structures as “Full AOP for all aquatic organisms”, “Reduced AOP for all aquatic organisms”, “No AOP for all aquatic organisms except adult salmonids”, or “No AOP for all aquatic organisms including adult salmonids” (Table 2‐10). “Full AOP” structures were scored “LOW”, “Reduced AOP” structures were scored “MODERATE”, and “No AOP” structures were combined and scored “HIGH” for simplicity.
Table 2‐10: AOP Level 1 Data Scoring VT Aquatic Organism Passage Full AOP Reduced AOP No AOP Coarse Screen for all aquatic for all aquatic for all aquatic for all aquatic organisms Updated 2/25/2008 organisms except adult organisms organisms including adult salmonids salmonids Green Gray AOP Function Variables / Values Orange Red (if all are true) (if any are true) at grade OR Culvert outlet invert type cascade free fall AND free fall AND backwatered Outlet drop (ft) = 0 > 0 , < 1 ft OR ≥ 1 ft OR
Downstream pool present = yes ( = yes AND = no OR ( = yes AND
Downstream pool entrance depth / outlet drop n/m > 1 ) n/a < 1 ) OR
Water depth in culvert at outlet (ft) < 0.3 ft
Number of culverts at crossing 1 > 1
Structure opening partially obstructed = none ≠ none
Sediment throughout structure yes no
For the Level 2 screen, the AOP Screen is combined with the results of a current habitat connectivity analysis calculated by performing a GIS analysis using the Barrier Assessment Tool (Hornby, 2008; TNC, 2010) to determine the upstream miles of habitat gained if the structure becomes passable. Culverts rated as “Full AOP for all aquatic organisms” were scored “LOW”. Culverts rated as “Reduced AOP for all aquatic organisms” with a less than 0.5 mile potential upstream habitat gain were also scored “LOW”. Culverts rated as “Reduced AOP for all aquatic organisms” with greater than or equal to 0.5 mile but less than 0.75 mile potential upstream habitat gain were scored “MODERATE” (Table 2‐11).
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Table 2‐11: AOP Level 2 Data Scoring
Upstream AOP Category Habitat Gained Score
All N/A
No BAT Result No BAT Result
< .25 mile
Reduced >=.25, <.5
>=.5,< .75 mile
>=.75 mile
No BAT Result No BAT Result
< .25 mile
Limited (strong >=.25, <.5 swimmers only) >=.5,< .75 mile
>=.75 mile
No BAT Result No BAT Result
< .25 mile
None >=.25, < .75
>=.5,<.75 mile
>=.75 mile
In the Level 3 AOP variable, coldwater fishery priority habitat information provided by NHFG were considered (Table 2‐12). For example, culverts with “No AOP” in the South Branch and North Branch were all scored “HIGH”. In the mainstem, structures were scored “MODERATE” if there was no habitat connectivity analysis available, or if the habitat gained was less than 0.25 miles, and “HIGH” if the habitat gained was greater than or equal to 0.25 miles. In the Middle Branch, structures were scored “LOW” if there was no habitat connectivity available or if the habitat gained was less than 0.25 miles, “MODERATE” if the habitat gained was less than 0.75 miles, and “HIGH” if the habitat gained was greater than or equal to 0.75 miles. The AOP score is displayed in the bottom left quadrant of the display icon.
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Table 2‐12: AOP Level 3 Data Scoring Fishery Rank
Minimum 12 3 4 AOP Category Habitat Gained
Fisheries Priority All N/A Locations (NHFG) Fishery Rank
Reduced No BAT Result South Branch 1
< .25 mile North Branch 2 >=.25, <.5 Mainstem 3 >=.5,< .75 mile Middle Branch 4
>=.75 mile
No BAT Result
< .25 mile Limited (strong >=.25, <.5 swimmers only) >=.5,< .75 mile
>=.75 mile
No BAT Result < .25 mile
>=.25, < .75 None >=.5,<.75 mile
>=.75 mile
2.1.5 Risk (R)
R is determined from the equally weighted combination of vulnerability (GC and STR) and criticality (C). AOP was not included in the calculation of R. A Risk score (“HIGH”, “MODERATE”, “LOW”) and Risk (priority) level were calculated for all possible combinations of STR, GC, and C (Table 2‐13). A risk level of 1, where GC, STR, and C are all high, is the highest. The risk score and level were selected based on experience gained during culvert failures and designs. The risk level was used to prioritize the need for culvert replacement with 1 being the most urgent replacement needs.
For Risk level combinations where no GC data were available, R was either a predetermined score (any GC score would result in the same R score), or was assigned an R score assuming the lowest possible GC score. This conservative assumption allowed all culverts to obtain a risk score. The risk score is shown on the outer ring of the display icon.
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Table 2‐13: R Scoring and Risk Levels Vulnerability Criticality Risk Risk Level Notes GC STR C R 1Highest risk level 2 3 4 5 6 7 8 9 ^ 10 ^Predetermined score ^ 11 ^Predetermined score *12*Assumed (conservative) *13*Assumed (conservative) 14 15 16 17 18 19 20 21 22 23 ^ 24 ^Predetermined score ^25*Assumed (conservative) ^26*Assumed (conservative) *27*Assumed (conservative) 28 29 ^ 30 ^Predetermined score 31 32 33 34 35 36 Lowest risk level
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3.0 RESULTS
3.1 Pilot Data Summary
Data distributions for each variable selected into the model were reviewed for the entire watershed and for each pilot town throughout the project to advance model development (Appendix A). The pilot data summary includes plots of variables, data level plots, and the distribution of the risk levels broken down by high (R=1 to 13), moderate (R=14‐27) and low (R=28 to 36). The data summary also includes culvert priority lists of the top 50 priority culverts for the watershed and the top 15 priority culverts for each pilot town.
3.2 Town Data Summary
Data distributions for culvert risk, risk data level, culvert priority, and each variable are provided for each of the six towns that contain most of the culverts. The Town data also includes a table with culvert priority list that can be used to seek out new projects and track changes to culverts before entering back into the model spreadsheet.
Deering (Appendix B) Dunbarton (Appendix C) Francestown (Appendix D) Goffstown (Appendix E) New Boston (Appendix F) Weare (Appendix G) Other towns with few assessed culverts in the watershed (Appendix H)
3.3 GC Score
Results from the GC variable showed that scores were distributed relatively evenly, with the most common score being “High” indicating incompatibility between a culvert and channel (Figure 3‐1). This pattern was also mirrored in the results for the three pilot towns.
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Figure 3‐1: GC Variable Score Distribution
The majority of assessed culverts were screened based on Level 2 data for the GC variable (Figure 3.2). When Level 2 data were not available, culverts were screenedd using Level 1 data (i.e., percent bankfull width). Fifty‐four of the assessed culverts in the watershed had no GC data.
Figure 3‐2: GC Data Level Distribution
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3.4 STR Score
Results from the STR variable showed that a majority of assessed culverts were scored “High” (Figure 3‐3). This result was anticipated based on initial findings that the majority of culverts in the watershed are undersized relative to the bankfull channel width and hydraulic capacity. These results were mirrored in the three pilot towns.
Figure 3‐3: STR Variable Sccore Distribution
The majority of culverts were screened based on Level 2 STR data (Figure 3‐4). Some Level 3 data were provided by the pilot towns.
Figure 3‐4: STR Data Level Distribution
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3.5 C Score
A majority of assessed culverts were scored “Low” for C (Figure 3.5). This result is expected as most roads in the watershed are small, local rroads in rural areas.
Figure 3‐5: C Variable Score Distribution
Most culverts were scored using C Level 1 daata (Figure 3‐6). Some Level 3 data were provided for highly critical culverts located in the pilot towns.
Figure 3‐6: C Data Level Distribution
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3.6 AOP Score
The most frequent score for the AOP variable was “High”, followed by “Moderate”, and then “Low” (Figure 3‐7). The scoring by Town reflects the NHFG priority areas used in data level 3. Many of the culverts scored as “High” were in the priority coldwater habitat areas.
Figure 3‐7: AOP Variable Score Distribution
Most culverts were screened using Level 3 data for AOP (Figure 3‐8).
Figure 3‐8: AOP Data Level Distribution
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3.7 R Score
Results of the R scoring showed a relatively even distribution, with “Moderate” thee most common score, followed by “High”, then “Low” (Figure 3‐9).
Figure 3‐9: R Screen Score Distribution
R Data Level Scores were based on the numerically summed data levels of the GC, STR, and C variables. Most culverts had a “Moderate” Data Level score (Figure 3‐10).
Figure 3‐10: R Data Level Diisstribution
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R results were further broken down by Risk Level to show how many culverts were scored at each risk level (Figure 3‐11).
Figure 3‐11: Risk Level Distribution
4.0 DISCUSSION
4.1 Model Use
The culvert screening model is considered to be a coarse screen basedd on available data. Findings should be verified in the field before making final decisions to replace a culvert and begin the design process.
Data may be out of date or inaccurate. The model has been designed to allow towns to update data for individual culverts and adjust prioritization.
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4.2 Model Flexibility
Data availability varied across the Piscataquog River watershed and will vary across future watersheds, and thus the model was designed to be flexible. The model will calculate the screen with all Level 1 data that tends to be readily available. However, the priority ranking will be less accurate using these less accurate data. Screen results based on Level 2 and Level 3 local data will likely lead to better culvert replacement priority rankings.
4.3 Stream Power and Bed Resistance
Stream reaches, bridges, and culverts are more frequently being screened based on stream power (i.e., the ability of the channel to do work or erode the bed and banks) and bed resistance (Knighton, 1999; Kleinhans and van den Berg, 2011; Schiff et al., 2015). Power and resistance were initially proposed to be in the screen, yet ultimately were excluded as necessary data are not widely available. While specific stream power can be estimated based on remote sensing data, bed sediment particle size data or a suitable qualitative indicator of bed resistance such as dominant particle size are not available at the state level.
4.4 Local Data Review and Input
The three project pilot towns of Francestown, Goffstown, and Weare were consulted over the course of the project to verify the results of the screen as it evolved. The towns identified unexpected results such as when a culvert known to be structurally deficient scored “Low” for the STR variable. Pilot towns helped determine the cause of unexpected results – whether it was due to out of date data, incorrect data, or an issue with the structure of the model. The pilot towns helped identify useful categories for local input for the C and STR variables.
Local flood risk information was collected by NHGS in each town in the watershed in 2015. These data were plotted in GIS; categorized as high, medium, or low risk; and then grouped by the primary culvert issue (Appendix I).
Past or potential flooding (F) Unspecified damage (D) Washout (W) Overtopping (O) Failure (X) Blocked by debris (B)
Data were updated, as needed, by the pilot towns. This information was initially used as a quality control check during model development, and was then added to the model as Level 3 data. It is anticipated that other towns in the Piscataquog River Basin will continue to add their own Level 3 data to improve the local prioritization of culverts.
CULVERT PRIORITIZATION MODEL DECEMBER 2016 PISCATAQUOG RIVER WATERSHED, NEW HAMPSHIRE PAGE 20
4.5 Future Implementation
Concept designs were prepared for a high‐priority culvert in both Francestown and Goffstown to begin the design process (Appendix J). Initial design recommendations follow general culvert design recommendations to reduce flood risk and promote aquatic organism passage, and adhere to the New Hampshire Wetlands Crossing Rules (UNH, 2009; Crystall, 2010).
During model development the potential expansion of this culvert prioritization model to other watersheds and perhaps the state was discussed. The model has been set up to be readily expanded to other area if the necessary data are available. The model requires the structural condition of each culvert, the Highway Tier, and the functional system of the road over the culvert to assign a risk score and priority rank. As indicated above, improved data would allow for a better prioritization.
5.0 REFERENCES
Crystall, S., 2010. Permitting Background and Stream Crossing Rules (Computer Slide Show). New Hampshire Department of Environmental Services, Wetlands Bureau, Concord, NH.
Hornby, D., 2008. Rivex (V. 5.0). Duncan Hornby BSc(Hons) , MSc ([email protected]), Southampton, UK.
Kleinhans, M. G. and J. H. van den Berg, 2011. River Channel and Bar Patterns Explained and Predicted by an Empirical and a Physics‐Based Method. Earth Surface Processes and Landforms 36(6):721‐738.
Knighton, A. D., 1999. Downstream Variation in Stream Power. Geomorphology 29(3‐4):293‐306.
Schiff, R., J. S. Clark, and S. Jaquith, 2008. The Vermont Culvert Geomorphic Compatibility Screening Tool. Prepared by Milone & MacBroom, Inc. with the VT DEC River Management Program, Waterbury, VT.
Schiff, R., J. C. Louisos, E. Fitzgerald, J. Bartlett, and L. Thompson, 2015. The Vermont River Sensitivity Coarse Screen. Prepared by Milone & MacBroom for the Vermont Land Trust and its conservation partners, Waterbury, VT.
TNC, 2010. The Barrier Assessment Tool (Bat). Created by Duncan Hornby for The Nature Conservancy, Brunswick, ME.
TU and SNHPC, 2012. Piscataquog River Stream Crossing Assessment Project Final Report: Evaluating Aquatic Organism Passage (AOP). Prepapred by Trout Unlimited and Southern New Hampshire Planning Commission, with assistance from the New Hampshire Geological Survey, New Hampshire Department of Environmental Services, and New Hampshire Department of Transportation, Concord, NH.
TU and SNHPC, 2014. Piscataquog River Watershed Stream Crossing Vulnerability Assessment Project: Evaluating Stream Crossing Vulnerability to Storm Event Flows (Http://Www.Snhpc.Org/Pdf/Piscataquogstreamxingreport020413.Pdf). Prepapred by Trout Unlimited and Southern New Hampshire Planning Commission, Concord, NH.
UNH, 2009. New Hampshire Stream Crossing Guidelines. University of New Hampshire, Durham, NH.
CULVERT PRIORITIZATION MODEL DECEMBER 2016 PISCATAQUOG RIVER WATERSHED, NEW HAMPSHIRE
APPENDIX A
WATERSHED AND PILOT TOWN RESULTS SUMMARY
Piscataquog River Watershed Culvert Prioritization Model Pilot Data Summary November 1, 2016
Francestown Francestown Francestown GC Screen Score Results STR Screen Score Results R Screen Score Results 100 100 100
350 350 350 21 23 15 15 11 3 10 8 11 300 0 300 0 300 0
250 250 250 Goffstown Goffstown Goffstown 196 200 100 200 100 200 100 Culverts Culverts Culverts
of of of 42 39 25 28 27 141 26 150 16 150 14 150 18 119 124 106 102 0 0 92 0 Number 100 78 Number 100 Number 100 59 50 Weare 50 Weare 50 Weare 100 100 100 0 0 56 0 HIGH MODERATE LOW 37 HIGH MODERATE LOW HIGH MODERATE LOW 37 25 25 25 34 26 Screen Score Screen Score 16 Screen Score 0 0 0
Francestown Francestown Francestown GC Data Level Results STR Data Level Results Datal Level Score 100 100 100
350 350 350 32 30 25 0 3 6 4 7 0 7 9 300 0 300 0 300 0 269 273
250 250 250 Goffstown Goffstown Goffstown
200 100 200 100 200 100 Culverts Culverts Culverts
66 173 54 of of of
29 26 32 25 150 14 150 150 3 0 0 0 109 0 0 0 Number Number Number 100 100 74 100 75 54 50 34 Weare 50 Weare 50 Weare 10 0 100 73 0 100 100 0 0 68 0 3 2 1 0 (no data) 3 2 1 0 (no data) HIGH MODERATE LOW 41 32 22 24 Data Level 14 10 Data Level 0 7 0 Data Level Score 0 0 0
Francestown Francestown C Screen Score Results AOP Screen Score Results Risk Level ‐ High Risk Culverts 100 100 50 350 350 23 26 13 5 8 6 40 0 0 300 300 26 Culverts 30 22 of 20 250 250 13 Goffstown Goffstown 12 10 12 7 10 6 5 4 200 187 100 200 100 Number 331 Culverts Culverts
of of 0 40 153 30 30 150 150 25 27 12345678910111213 120 13 123 Priority Level 0 0 Number 100 Number 100 73 50 50 Weare 50 Weare Risk Level ‐ Moderate Risk Culverts 100 100 0 0 51 50 HIGH MODERATE LOW HIGH MODERATE LOW 43 34 27 25 Screen Score 12 Screen Score 40 34 0 0
Culverts 30
24 21 21 of 20 Francestown Francestown 11 7 C Data Level Results AOP Data Level Results 10 5 4 6 100 100 Number 22 11 2 349 0 350 350 40 28 14 15 16 17 18 19 20 21 22 23 24 25 26 27 12 1 0 001 Priority Level 300 0 300 0 252 250 250 Goffstown Goffstown Risk Level ‐ Low Risk Culverts 200 100 200 100 82 Culverts Culverts 50
of 48 of
150 25 150 10 40 0 001 0 0 Number Number
Culverts 30
100 100 69 21 of 20 17 50 36 Weare 50 Weare 11 11 8 10 8 95 10 5 6
0 100 00 100 Number 3 0 66 0 0 3 2 1 0 (no data 3 2 1 0 (no data) 21 28 29 30 31 32 33 34 35 36 Data Level 10 Data Level 2 0 00 Priority Level 0 0 Piscataquog River Watershed Culvert Prioritization Model Priority List November 1, 2016
15 Highest Priority Culverts ‐ Francestown SADES_ID Town Road Stream Risk Level SADES_ID Town Road Stream Risk Level 771 Goffstown Elm St Piscataquog 1 1148 Francestown Bennington Rd Collins Brook 1 772 Goffstown Elm St Piscataquog 1 1186 Francestown Birdsall South Branch Piscataquog 4 928 Weare River Rd 1 1180 Francestown Reid RD South Branch Piscataquog 5 1010 Goffstown Wallace Dan Little Brook 1 1161 Francestown Bennington Rd Dinsmore Brook 5 1024 Goffstown Juniper Dr Henry Brook 1 1187 Francestown Birdsall South Branch Piscataquog 5 1030 Goffstown Autumn Piscataquog 1 1155 Francestown Bennington Rd Dinsmore brook 6 1036 Goffstown Stinson Piscataquog 1 1166 Francestown greenfield rd rand brook 6 1057 Goffstown rt 114 Piscataquog 1 1154 Francestown Bennington Dinsmore Brook 7 1058 Manchester Rockland Rockland Creek 1 1182 Francestown Muzzey South Branch Piscataquog 9 1068 Weare poor farm road currier brook 1 1124 Francestown Rte 136 10 1070 Weare rte 149 hillside brook 1 1176 Francestown Russell Station Rand Brook 14 1079 New Boston Francestown Road Middle Branch Piscataquog 1 801 Francestown Avery Rd Piscataquog 14 1083 New Boston francestown road 1 1123 Francestown Dennison Pond Rd 14 1085 New Boston rte 77 1 1159 Francestown 2nd NH Turnpike Dinsmore Brook 14 1093 Weare rte 149 Meadow Brook 1 1160 Francestown Mountain Rd Dinsmore Brook 14 1094 Weare Gen Knox Rd 1 1111 Weare Deering Center Road Peacock Brook 1 15 Highest Priority Culverts ‐ Goffstown 1114 Weare Deering Center Road Peacock Brook 1 SADES_ID Town Road Stream Risk Level 1148 Francestown Bennington Rd Collins Brook 1 772 Goffstown Elm St Piscataquog 1 1231 New Boston Old Coach Piscataquog 1 1010 Goffstown Wallace Dan Little Brook 1 1233 New Boston Mont Vernon Piscataquog 1 771 Goffstown Elm St Piscataquog 1 1234 New Boston Francestown Rd Piscataquog 1 1036 Goffstown Stinson Piscataquog 1 1273 Deering Zoski Piscataquog 1 1057 Goffstown rt 114 Piscataquog 1 1274 Deering Fisher 1 1024 Goffstown Juniper Dr Henry Brook 1 5187 Weare Mountain Rd. Buxton Brook 1 1030 Goffstown Autumn Piscataquog 1 5281 Weare reservoir road Piscataquog Trib 1 765 Goffstown Center Street Cemetary Brook 2 765 Goffstown Center Street Cemetary Brook 2 5194 Goffstown Rt. 114/Stark Highway (GRB‐1) Gorham Brook 2 908 Weare N John Stark Highway Breed Brook 2 1040 Goffstown Maple Piscataquog 2 909 Weare Center Rd 2 1044 Goffstown Paige Hill Rd Piscataquog 2 1040 Goffstown Maple Piscataquog 2 1045 Goffstown Glenwood Dr Piscataquog 2 1044 Goffstown Paige Hill Rd Piscataquog 2 1042 Goffstown S Main St Piscataquog 3 1045 Goffstown Glenwood Dr Piscataquog 2 1047 Goffstown Goffstown Back Rd Piscataquog 3 1065 Weare Cram Buxton Brook 2 5228 Goffstown New Boston Rd (Bog Brook 1) Bog Brook 3 1072 Weare Oak Hill RD Hillside Brook 2 1213 New Boston Mont Vernon Meadow Brook 2 15 Highest Priority Culverts ‐ Weare 1244 New Boston Rte 13 Piscataquog 2 SADES_ID Town Road Stream Risk Level 1271 Deering Fisher 2 928 Weare River Rd 1 1272 Deering Fisher 2 1068 Weare poor farm road currier brook 1 5194 Goffstown Rt. 114/Stark Highway (GRB‐1) Gorham Brook 2 5187 Weare Mountain Rd. Buxton Brook 1 937 Weare River Rd Piscataquog 3 1070 Weare rte 149 hillside brook 1 1042 Goffstown S Main St Piscataquog 3 1094 Weare Gen Knox Rd 1 1047 Goffstown Goffstown Back Rd Piscataquog 3 1114 Weare Deering Center Road Peacock Brook 1 1277 Deering E Deering Rd 3 5281 Weare reservoir road Piscataquog Trib 1 4869 Goffstown Mast Rd 3 1093 Weare rte 149 Meadow Brook 1 4873 Goffstown Greer Rd 3 1111 Weare Deering Center Road Peacock Brook 1 5228 Goffstown New Boston Rd (Bog Brook 1) Bog Brook 3 1065 Weare Cram Buxton Brook 2 806 New Boston Hooper Hill Road 4 1072 Weare Oak Hill RD Hillside Brook 2 921 Weare reservoir rd 4 908 Weare N John Stark Highway Breed Brook 2 993 Goffstown Roby Rd Bog Brook 4 909 Weare Center Rd 2 1004 New Boston Bedford Bog Brook 4 937 Weare River Rd Piscataquog 3 921 Weare reservoir rd 4 CULVERT PRIORITIZATION MODEL DECEMBER 2016 PISCATAQUOG RIVER WATERSHED, NEW HAMPSHIRE
APPENDIX B
DEERING
DEERING Culvert Summary Data November 1, 2016
Risk and Priority Data
Culvert Risk Risk Data Level
50 50
45 45
40 40
35 35
30 30 Culverts Culverts
of of 25 25
20 20 14 Number Number 15 15 9 9 10 8 10 6 5 5 0 0 0 HIGH MODERATE LOW HIGH MODERATE LOW
Screen Score Screen Score
Culvert Priority (1 = High) 15
13
11
9 Culverts
of 7
5 Number 3 3 22 2 2 2 1 1 1 11 11 111 1 00 00 000 0000 00000 0000
‐1 123456789101112131415161718192021222324252627282930313233343536 Priority Level DEERING Culvert Summary Data November 1, 2016
Variable Data
Geomorphic Compatibility Structural Condition / Hydraulic Capacity
50 50
45 45
40 40
35 35
30 30 Culverts Culverts
of of 25 25
20 20 Number Number 15 15 9 10 9 10 8 10 4 5 3 5
0 0 HIGH MODERATE LOW HIGH MODERATE LOW
Screen Score Screen Score
Criticality Aquatic Organism Passage
50 50
45 45
40 40
35 35
30 30 Culverts Culverts
of 25 of 25
20 20 17
Number 15 13 Number 15 10 10 10 5 5 5 0 1 0 0 HIGH MODERATE LOW HIGH MODERATE LOW
Screen Score Screen Score Select Town: Deering
SADES_ID Town Road Stream Owner AOP GC STR C R Data Score Risk Level Red Listed Town CIP 10‐year Road Plan Structural Reinspection Replaced with Replacement date Replacement cost Local ID 1274 DEERING Fisher unk HIGH HIGH HIGH HIGH HIGH MODERATE 1 1273 DEERING Zoski Piscataquog HIGH HIGH HIGH HIGH HIGH MODERATE 1 1272 DEERING Fisher unk HIGH MODERATE HIGH HIGH HIGH MODERATE 2 1271 DEERING Fisher unk MODERATE MODERATE HIGH HIGH HIGH MODERATE 2 1277 DEERING E Deering Rd unk NH DOT MODERATE HIGH MODERATE HIGH HIGH MODERATE 3 1278 DEERING E Deering unk NH DOT HIGH HIGH LOW HIGH HIGH MODERATE 6 1275 DEERING Zoski Piscataquog HIGH MODERATE MODERATE HIGH HIGH MODERATE 7 1270 DEERING E Deering Rd unknown NH DOT HIGH MODERATE MODERATE HIGH HIGH MODERATE 7 1283 DEERING Deering rd piscatatquog NH DOT LOW Unable to Score HIGH HIGH HIGH LOW 10 1269 DEERING Old County Piscataquog HIGH HIGH HIGH LOW MODERATE LOW 14 1293 DEERING E deering unk NH DOT MODERATE LOW MODERATE HIGH MODERATE MODERATE 15 1265 DEERING Glenn Rd Dudley Brook HIGH MODERATE HIGH LOW MODERATE MODERATE 20 1264 DEERING Gove Rd Dudley Brook HIGH MODERATE HIGH LOW MODERATE MODERATE 20 1261 DEERING Dudley Pond rd Dudley Brook MODERATE MODERATE HIGH LOW MODERATE MODERATE 20 1268 DEERING Falls Rd Piscataquog HIGH HIGH MODERATE LOW MODERATE LOW 21 1294 DEERING Clement Hill Smith Brook HIGH HIGH MODERATE LOW MODERATE LOW 21 1282 DEERING camp rd unk HIGH Unable to Score MODERATE LOW MODERATE LOW 27 1260 DEERING Quaker Dudley Brook HIGH LOW HIGH LOW LOW MODERATE 28 1281 DEERING cross rd Piscataquog MODERATE HIGH LOW LOW LOW LOW 29 1267 DEERING Pond Patten Brook HIGH HIGH LOW LOW LOW LOW 29 1295 deering Clement Hill Rd smith brook HIGH Unable to Score LOW LOW LOW LOW 30 1296 DEERING North Rd Smith Brook HIGH MODERATE MODERATE LOW LOW LOW 31 1297 DEERING North Rd Smith Brook HIGH LOW MODERATE LOW LOW MODERATE 32 CULVERT PRIORITIZATION MODEL DECEMBER 2016 PISCATAQUOG RIVER WATERSHED, NEW HAMPSHIRE
APPENDIX C
DUNBARTON
DUNBARTON Culvert Summary Data November 1, 2016
Risk and Priority Data
Culvert Risk Risk Data Level
50 50
45 45
40 40
35 35
30 30 Culverts Culverts
of of 25 25
20 20 20 15 Number Number 15 15 9 10 10 5 5 2 5 3 0 0 HIGH MODERATE LOW HIGH MODERATE LOW
Screen Score Screen Score
Culvert Priority (1 = High) 15
13
11
9
Culverts 7
of 7
5 5 5 Number
3 2 2 1 11 1 1 1 1 0000 000 00 00 00 000 000000 00 0
‐1 123456789101112131415161718192021222324252627282930313233343536 Priority Level DUNBARTON Culvert Summary Data November 1, 2016
Variable Data
Geomorphic Compatibility Structural Condition / Hydraulic Capacity
50 50
45 45
40 40
35 35
30 30 Culverts Culverts
of of 25 25
22 20 20 Number Number 15 15
10 8 7 10 4 4 5 5 1 0 0 HIGH MODERATE LOW HIGH MODERATE LOW
Screen Score Screen Score
Criticality Aquatic Organism Passage
50 50
45 45
40 40
35 35
30 30 Culverts Culverts
of 25 of 25 20 20 20
Number 15 Number 15 12 10 10 10 5 5 5 2 5 0 0 HIGH MODERATE LOW HIGH MODERATE LOW
Screen Score Screen Score Select Town: Dunbarton
SADES_ID Town Road Stream Owner AOP GC STR C R Data Score Risk Level Red Listed Town CIP 10‐year Road Plan Structural Reinspection Replaced with Replacement date Replacement cost Local ID 942 DUNBARTON Stark Hwy N Stark Brook NH DOT HIGH LOW HIGH HIGH HIGH HIGH 5 945 DUNBARTON Stark Stark Brook NH DOT MODERATE LOW HIGH MODERATE HIGH MODERATE 9 866 DUNBARTON Rte 13 Gorham Brook NH DOT LOW Unable to Score HIGH HIGH HIGH LOW 10 892 DUNBARTON Barnard Hill Rd Barnard Brook MODERATE Unable to Score HIGH MODERATE HIGH LOW 11 943 DUNBARTON stark lane Stark Brook NH DOT HIGH Unable to Score HIGH MODERATE HIGH LOW 11 1315 DUNBARTON Gorham Pond rd Gorham Brook HIGH HIGH HIGH LOW MODERATE MODERATE 14 1246 DUNBARTON Gorham Lake Rd unk MODERATE HIGH HIGH LOW MODERATE MODERATE 14 947 DUNBARTON Winslow Stark Brook HIGH HIGH HIGH LOW MODERATE MODERATE 14 938 DUNBARTON Old Hopkinton Stark Brook MODERATE HIGH HIGH LOW MODERATE MODERATE 14 1013 DUNBARTON black brook rd unk HIGH HIGH HIGH LOW MODERATE LOW 14 946 DUNBARTON Stark Stark Brook NH DOT MODERATE HIGH MODERATE MODERATE MODERATE MODERATE 17 894 DUNBARTON Mansion Rd Barnard Brook NH DOT HIGH MODERATE HIGH LOW MODERATE HIGH 20 893 DUNBARTON Mansion Rd Barnard Brook NH DOT HIGH MODERATE HIGH LOW MODERATE HIGH 20 5279 DUNBARTON Stephanie Rd Gorham Brook LOW MODERATE HIGH LOW MODERATE MODERATE 20 1016 DUNBARTON black brook rd harry brook MODERATE MODERATE HIGH LOW MODERATE MODERATE 20 941 DUNBARTON Tenney Hill Rd Stark Brook HIGH MODERATE HIGH LOW MODERATE MODERATE 20 940 DUNBARTON Tenney Hill Stark Brook HIGH MODERATE HIGH LOW MODERATE MODERATE 20 1247 DUNBARTON Karen Rd gorham Brook MODERATE HIGH MODERATE LOW MODERATE MODERATE 21 1015 DUNBARTON Long Pond Rd Harry Brook HIGH HIGH MODERATE LOW MODERATE MODERATE 21 1314 DUNBARTON Gorham Pond Rd unk HIGH Unable to Score HIGH LOW MODERATE LOW 25 1313 DUNBARTON Gorham Pond Rd Gorham Brook MODERATE Unable to Score HIGH LOW MODERATE LOW 25 1245 DUNBARTON gorham lake rd unk MODERATE Unable to Score HIGH LOW MODERATE LOW 25 1014 DUNBARTON MoosePoint Rd Harry Brook LOW Unable to Score HIGH LOW MODERATE LOW 25 1012 DUNBARTON Powell Ln unk LOW Unable to Score HIGH LOW MODERATE LOW 25 944 DUNBARTON Stinson Stark Brook MODERATE LOW MODERATE LOW LOW MODERATE 32 895 DUNBARTON Everett Dam Rd Barnard Brook NH DOT HIGH LOW LOW MODERATE LOW MODERATE 35 CULVERT PRIORITIZATION MODEL DECEMBER 2016 PISCATAQUOG RIVER WATERSHED, NEW HAMPSHIRE
APPENDIX D
FRANCESTOWN
FRANCESTOWN Culvert Summary Data November 1, 2016
Risk and Priority Data
Culvert Risk Risk Data Level
50 50
45 45
40 40
35 35
30 30 Culverts Culverts 25
of of 25 25
20 20 15 15 Number Number 15 15 11 9 10 10 7 5 5
0 0 HIGH MODERATE LOW HIGH MODERATE LOW
Screen Score Screen Score
Culvert Priority (1 = High) 15
13
11
9 Culverts
of 7
5 5 5 4 4 Number 3 3 3 2 2 2 2 1 1 1 11 1 1 1 1 1 00 0 000 0000 000 0 00 0
‐1 123456789101112131415161718192021222324252627282930313233343536 Priority Level FRANCESTOWN Culvert Summary Data November 1, 2016
Variable Data
Geomorphic Compatibility Structural Condition / Hydraulic Capacity
50 50
45 45
40 40
35 35
30 30 Culverts Culverts
23 of of 25 25
21 20 20 Number Number 15 15 11 10 10 10 8
5 3 5
0 0 HIGH MODERATE LOW HIGH MODERATE LOW
Screen Score Screen Score
Criticality Aquatic Organism Passage
50 50
45 45
40 40
35 35
30 30 26 Culverts Culverts 23
of 25 of 25
20 20
Number 15 13 Number 15
10 10 8 5 6 5 5
0 0 HIGH MODERATE LOW HIGH MODERATE LOW
Screen Score Screen Score Select Town: Francestown
SADES_ID Town Road Stream Owner AOP GC STR C R Data Score Risk Level Red Listed Town CIP 10‐year Road Plan Structural Reinspection Replaced with Replacement date Replacement cost Local ID 1148 FRANCESTOWN Bennington Rd Collins Brook NH DOT HIGH HIGH HIGH HIGH HIGH MODERATE 1 1186 FRANCESTOWN Birdsall South Branch Piscataquog MODERATE HIGH HIGH MODERATE HIGH LOW 4 1150 FRANCESTOWN Old County collins Brook HIGH LOW HIGH HIGH HIGH HIGH 5 1180 FRANCESTOWN Reid RD South Branch Piscataquog Municipal HIGH LOW HIGH HIGH HIGH HIGH 5 1187 FRANCESTOWN Birdsall South Branch Piscataquog MODERATE LOW HIGH HIGH HIGH MODERATE 5 1161 FRANCESTOWN Bennington Rd Dinsmore Brook NH DOT HIGH LOW HIGH HIGH HIGH MODERATE 5 1155 FRANCESTOWN Bennington Rd Dinsmore brook NH DOT HIGH HIGH LOW HIGH HIGH HIGH 6 1166 FRANCESTOWN greenfield rd rand brook NH DOT HIGH LOW HIGH HIGH MODERATE 6 1154 FRANCESTOWN Bennington Dinsmore Brook NH DOT HIGH MODERATE MODERATE HIGH HIGH MODERATE 7 1182 FRANCESTOWN Muzzey South Branch Piscataquog HIGH LOW HIGH MODERATE HIGH MODERATE 9 1124 FRANCESTOWN Rte 136 unk NH DOT LOW Unable to Score HIGH HIGH HIGH LOW 10 1176 FRANCESTOWN Russell Station Rand Brook HIGH HIGH HIGH LOW MODERATE HIGH 14 1160 FRANCESTOWN Mountain Rd Dinsmore Brook HIGH HIGH HIGH LOW MODERATE MODERATE 14 1159 FRANCESTOWN 2nd NH Turnpike Dinsmore Brook HIGH HIGH HIGH LOW MODERATE MODERATE 14 1123 FRANCESTOWN Dennison Pond Rd unk MODERATE HIGH HIGH LOW MODERATE MODERATE 14 801 FRANCESTOWN Avery Rd Piscataquog HIGH HIGH HIGH LOW MODERATE LOW 14 1119 FRANCESTOWN rte 136 unk NH DOT MODERATE LOW MODERATE HIGH MODERATE HIGH 15 1177 FRANCESTOWN Poor Farm South Branch Piscataquog HIGH LOW MODERATE HIGH MODERATE MODERATE 15 1152 FRANCESTOWN Mountain Rd Dinsmore Brook HIGH MODERATE HIGH LOW MODERATE MODERATE 20 1162 FRANCESTOWN Abbott Ln Dinsmore Brook HIGH HIGH MODERATE LOW MODERATE MODERATE 21 1153 FRANCESTOWN Back Mtn Rd Dinsmore Brook HIGH HIGH MODERATE LOW MODERATE MODERATE 21 803 FRANCESTOWN Dodge Rd piscataquog HIGH Unable to Score HIGH LOW MODERATE LOW 25 1158 FRANCESTOWN 2nd NH Turnpike Dinsmore Brook MODERATE Unable to Score HIGH LOW MODERATE LOW 25 1116 FRANCESTOWN bible hill rd ext whiting brook LOW Unable to Score HIGH LOW MODERATE LOW 25 1179 FRANCESTOWN Udall Rd unk HIGH Unable to Score HIGH LOW MODERATE LOW 25 1120 FRANCESTOWN red house rd unk MODERATE Unable to Score MODERATE LOW MODERATE LOW 27 1156 FRANCESTOWN School House Rd Dinsmore Brook Municipal HIGH LOW HIGH LOW LOW HIGH 28 5272 FRANCESTOWN S New boston Rd Piscataquog HIGH LOW HIGH LOW LOW MODERATE 28 1189 FRANCESTOWN Woodward Hill Piscataquog HIGH LOW HIGH LOW LOW MODERATE 28 1126 FRANCESTOWN scobie whiting brook MODERATE LOW HIGH LOW LOW MODERATE 28 1117 FRANCESTOWN bible hill rd Whiting Brook LOW MODERATE MODERATE LOW LOW MODERATE 31 1157 FRANCESTOWN 2nd NH Turnpike unk LOW LOW MODERATE LOW LOW MODERATE 32 1149 FRANCESTOWN Fisher Hill Collins Brook HIGH LOW MODERATE LOW LOW MODERATE 32 802 FRANCESTOWN Dodge Hill Rd Piscataquog MODERATE LOW MODERATE LOW LOW LOW 32 5267 FRANCESTOWN Rt. 136 (New Boston Rd.) South Branch River NH DOT LOW LOW LOW HIGH LOW MODERATE 34 5266 FRANCESTOWN Francestown Turnpike South Branch River HIGH LOW LOW MODERATE LOW MODERATE 35 1185 FRANCESTOWN Juniper Hill South Branch Piscataquog HIGH LOW LOW MODERATE LOW MODERATE 35 1147 FRANCESTOWN Old Cty Rd Collins Brook HIGH LOW LOW LOW LOW HIGH 36 CULVERT PRIORITIZATION MODEL DECEMBER 2016 PISCATAQUOG RIVER WATERSHED, NEW HAMPSHIRE
APPENDIX E
GOFFSTOWN
GOFFSTOWN Culvert Summary Data November 1, 2016
Risk and Priority Data
Culvert Risk Risk Data Level
50 50
45 45 39 40 40
35 35 32 30 30 26 26 Culverts Culverts 25
of of 25 25
20 18 20 Number Number 15 15
10 10
5 5
0 0 HIGH MODERATE LOW HIGH MODERATE LOW
Screen Score Screen Score
Culvert Priority (1 = High) 15
13 11 11
9
Culverts 7
of 7 6 55 5 5 Number 3 3333 3 3 3 2 2 22 2 2 1 11 111 1 1 1 1 1 1 0 00 0 0 0
‐1 123456789101112131415161718192021222324252627282930313233343536 Priority Level GOFFSTOWN Culvert Summary Data November 1, 2016
Variable Data
Geomorphic Compatibility Structural Condition / Hydraulic Capacity
50 50
45 45 42 40 40
35 35
30 28 30 27 Culverts Culverts 25
of of 25 25
20 20 16 14 Number Number 15 15
10 10
5 5
0 0 HIGH MODERATE LOW HIGH MODERATE LOW
Screen Score Screen Score
Criticality Aquatic Organism Passage
50 50
45 45 40 40 40
35 35 30 30 30 30 27
Culverts Culverts 25
of 25 of 25
20 20
Number 15 13 Number 15
10 10
5 5
0 0 HIGH MODERATE LOW HIGH MODERATE LOW
Screen Score Screen Score Select Town: Goffstown
SADES_ID Town Road Stream Owner AOP GC STR C R Data Score Risk Level Red Listed Town CIP 10‐year Road Plan Structural Reinspection Replaced with Replacement date Replacement cost Local ID 1010 GOFFSTOWN Wallace Dan Little Brook MODERATE HIGH HIGH HIGH HIGH HIGH 1 4685 772 GOFFSTOWN Elm St Piscataquog MODERATE HIGH HIGH HIGH HIGH HIGH 1 3872 1057 GOFFSTOWN rt 114 Piscataquog NH DOT HIGH HIGH HIGH HIGH HIGH HIGH 1 0 1036 GOFFSTOWN Stinson Piscataquog Municipal LOW HIGH HIGH HIGH HIGH HIGH 1 4593 771 GOFFSTOWN Elm St Piscataquog HIGH HIGH HIGH HIGH HIGH HIGH 1 1852 1030 GOFFSTOWN Autumn Piscataquog LOW HIGH HIGH HIGH HIGH MODERATE 1 3764 1024 GOFFSTOWN Juniper Dr Henry Brook MODERATE HIGH HIGH HIGH HIGH MODERATE 1 4465 765 GOFFSTOWN Center Street Cemetary Brook HIGH MODERATE HIGH HIGH HIGH HIGH 2 2016 5194 GOFFSTOWN Rt. 114/Stark Highway (GRB‐Gorham Brook NH DOT HIGH MODERATE HIGH HIGH HIGH HIGH 2 4545 1045 GOFFSTOWN Glenwood Dr Piscataquog MODERATE MODERATE HIGH HIGH HIGH MODERATE 2 3855 1044 GOFFSTOWN Paige Hill Rd Piscataquog LOW MODERATE HIGH HIGH HIGH MODERATE 2 108 1040 GOFFSTOWN Maple Piscataquog LOW MODERATE HIGH HIGH HIGH MODERATE 2 3762 1047 GOFFSTOWN Goffstown Back Rd Piscataquog LOW HIGH MODERATE HIGH HIGH HIGH 3 3131 1042 GOFFSTOWN S Main St Piscataquog Municipal LOW HIGH MODERATE HIGH HIGH HIGH 3 649 5228 GOFFSTOWN New Boston Rd (Bog Brook 1Bog Brook Municipal HIGH HIGH MODERATE HIGH HIGH HIGH 3 4002 4873 GOFFSTOWN Greer Rd LOW HIGH MODERATE HIGH HIGH MODERATE 3 4353 4869 GOFFSTOWN Mast Rd Municipal MODERATE HIGH MODERATE HIGH HIGH MODERATE 3 3485 993 GOFFSTOWN Roby Rd Bog Brook MODERATE HIGH HIGH MODERATE HIGH HIGH 4 4766 1059 GOFFSTOWN Goffstown Back Rd
APPENDIX F
NEW BOSTON
NEW BOSTON Culvert Summary Data November 1, 2016
Risk and Priority Data
Culvert Risk Risk Data Level
49 50 50
45 45
40 38 40
35 35 30 29 30 30 30 Culverts Culverts
of of 25 25
20 20 18 Number Number 15 15
10 10
5 5
0 0 HIGH MODERATE LOW HIGH MODERATE LOW
Screen Score Screen Score
Culvert Priority (1 = High) 15 13 13
11
9 8
Culverts 7
of 7 6 6 5 5 5 4 4 Number 3 3 3 3 3 3 3 3 2 2 2 2 222 1 1 1 1 1 0 0 0 0 0 0 00 0
‐1 123456789101112131415161718192021222324252627282930313233343536 Priority Level NEW BOSTON Culvert Summary Data November 1, 2016
Variable Data
Geomorphic Compatibility Structural Condition / Hydraulic Capacity
50 50 44 45 45
40 40 34 35 35 33
30 30 Culverts Culverts 25
24 of of 25 25
20 20 20 Number Number 15 15
10 10
5 5
0 0 HIGH MODERATE LOW HIGH MODERATE LOW
Screen Score Screen Score
Criticality Aquatic Organism Passage
50 50
45 45
40 40
35 35 29 30 30
Culverts 25 Culverts
of 25 of 25
20 17 20
Number 15 Number 15 13
10 10
5 5
0 0 HIGH MODERATE LOW HIGH MODERATE LOW
Screen Score Screen Score Select Town: New Boston
SADES_ID Town Road Stream Owner AOP GC STR C R Data Score Risk Level Red Listed Town CIP 10‐year Road Plan Structural Reinspection Replaced with Replacement date Replacement cost Local ID 1233 NEW BOSTON Mont Vernon Piscataquog NH DOT HIGH HIGH HIGH HIGH HIGH HIGH 1 1085 NEW BOSTON rte 77 unk NH DOT LOW HIGH HIGH HIGH HIGH HIGH 1 1234 NEW BOSTON Francestown Rd Piscataquog NH DOT MODERATE HIGH HIGH HIGH HIGH MODERATE 1 1079 NEW BOSTON Francestown Road Middle Branch Piscataquog NH DOT MODERATE HIGH HIGH HIGH HIGH MODERATE 1 1231 NEW BOSTON Old Coach Piscataquog MODERATE HIGH HIGH HIGH HIGH LOW 1 1083 NEW BOSTON francestown road unk NH DOT LOW HIGH HIGH HIGH HIGH LOW 1 1244 NEW BOSTON Rte 13 Piscataquog NH DOT HIGH MODERATE HIGH HIGH HIGH HIGH 2 1213 NEW BOSTON Mont Vernon Meadow Brook NH DOT HIGH MODERATE HIGH HIGH HIGH HIGH 2 1004 NEW BOSTON Bedford Bog Brook HIGH HIGH HIGH MODERATE HIGH MODERATE 4 806 NEW BOSTON Hooper Hill Road unk HIGH HIGH HIGH MODERATE HIGH MODERATE 4 1075 NEW BOSTON Francestown Road Middle Branch Piscataquog TNH DOT LOW LOW HIGH HIGH HIGH HIGH 5 807 NEW BOSTON river rd Cochrane Brook NH DOT HIGH LOW HIGH HIGH HIGH HIGH 5 1236 NEW BOSTON Bedford Rd Piscataquog HIGH LOW HIGH HIGH HIGH MODERATE 5 5280 NEW BOSTON Mont Vernon Piscataquog NH DOT HIGH MODERATE MODERATE HIGH HIGH HIGH 7 5275 NEW BOSTON River Rd Piscataquog NH DOT HIGH MODERATE MODERATE HIGH HIGH HIGH 7 5271 NEW BOSTON Rte 13 Piscataquog NH DOT HIGH MODERATE MODERATE HIGH HIGH HIGH 7 1206 NEW BOSTON Mont Vernon Meadow Brook NH DOT HIGH MODERATE MODERATE HIGH HIGH MODERATE 7 1082 NEW BOSTON Francestown Road Piscataquog River NH DOT MODERATE MODERATE MODERATE HIGH HIGH MODERATE 7 1217 NEW BOSTON 2nd NH Turnpike Piscataquog MODERATE MODERATE HIGH MODERATE HIGH MODERATE 8 1228 NEW BOSTON Old Coach Rd Piscataquog HIGH LOW HIGH MODERATE HIGH MODERATE 9 986 NEW BOSTON Chestnut Hill Rd Bog Brook NH DOT HIGH LOW HIGH MODERATE HIGH MODERATE 9 798 NEW BOSTON Francestown Tpk Cold Bk MODERATE LOW HIGH MODERATE HIGH MODERATE 9 1200 NEW BOSTON Mont Vernon Rd Meadow brook NH DOT HIGH Unable to Score HIGH HIGH HIGH LOW 10 1230 NEW BOSTON Town Farm Piscataquog HIGH Unable to Score HIGH HIGH HIGH LOW 10 1077 NEW BOSTON Francestown Road Piscataquog River NH DOT MODERATE Unable to Score MODERATE HIGH HIGH LOW 12 5282 NEW BOSTON Clark Hill Rd Piscataquog Unable to Score MODERATE HIGH HIGH LOW 12 1199 NEW BOSTON Meadow Rd Meadow Brook MODERATE HIGH HIGH LOW MODERATE HIGH 14 1226 NEW BOSTON McCollum Piscataquog MODERATE HIGH HIGH LOW MODERATE MODERATE 14 1221 NEW BOSTON S Hill rd Piscataquog HIGH HIGH HIGH LOW MODERATE MODERATE 14 1210 NEW BOSTON Houghton Meadow Brook HIGH HIGH HIGH LOW MODERATE MODERATE 14 1198 NEW BOSTON Joe English Rd Meadow Brook HIGH HIGH HIGH LOW MODERATE MODERATE 14 1125 NEW BOSTON Scoby Rd. (MBPR 24) Middle Branch MODERATE HIGH HIGH LOW MODERATE MODERATE 14 1074 NEW BOSTON Bunker Hill Road Middle Branch tributary Municipal MODERATE HIGH HIGH LOW MODERATE MODERATE 14 997 NEW BOSTON Carriage Rd Bog Brook LOW HIGH HIGH LOW MODERATE MODERATE 14 776 NEW BOSTON Bunker Hill Rd Bukston Brook LOW HIGH HIGH LOW MODERATE MODERATE 14 5245 NEW BOSTON Tucker Hill Road Peacock Brook MODERATE HIGH HIGH LOW MODERATE LOW 14 1078 NEW BOSTON Colburn Middle Branch Trib LOW HIGH HIGH LOW MODERATE LOW 14 1000 NEW BOSTON McCurdy Bog Brook MODERATE HIGH HIGH LOW MODERATE LOW 14 1242 NEW BOSTON Rte 13 Piscataquog NH DOT HIGH LOW MODERATE HIGH MODERATE HIGH 15 1229 NEW BOSTON Greenfield Rd Piscataquog HIGH HIGH MODERATE MODERATE MODERATE MODERATE 17 797 NEW BOSTON Francestown Tpk Cold Brook MODERATE HIGH MODERATE MODERATE MODERATE MODERATE 17 1002 NEW BOSTON Bedford Rd bog brook MODERATE HIGH MODERATE MODERATE MODERATE LOW 17 5189 NEW BOSTON Bedford Rd. (Bog Brook 7) Bog Brook HIGH HIGH LOW MODERATE MODERATE LOW 19 1243 NEW BOSTON Parker Piscataquog HIGH MODERATE HIGH LOW MODERATE MODERATE 20 1225 NEW BOSTON S Hill Rd Piscataquog HIGH MODERATE HIGH LOW MODERATE MODERATE 20 1222 NEW BOSTON S Hill Rd Piscataquog MODERATE MODERATE HIGH LOW MODERATE MODERATE 20 1220 NEW BOSTON Lyndeborough Rd Piscataquog HIGH MODERATE HIGH LOW MODERATE MODERATE 20 1192 NEW BOSTON Mtn Rd cold Brook HIGH MODERATE HIGH LOW MODERATE MODERATE 20 1076 NEW BOSTON Pine Road Middle Branch Trib LOW MODERATE HIGH LOW MODERATE MODERATE 20 777 NEW BOSTON Saunders Hill Road no name LOW MODERATE HIGH LOW MODERATE MODERATE 20 1239 NEW BOSTON Byam Piscataquog HIGH HIGH MODERATE LOW MODERATE MODERATE 21 1224 NEW BOSTON Mc Collum Piscataquog HIGH HIGH MODERATE LOW MODERATE MODERATE 21 1219 NEW BOSTON Cochran Hill Rd Piscataquog HIGH HIGH MODERATE LOW MODERATE MODERATE 21 1197 NEW BOSTON Joe English Rd Meadow Brook HIGH HIGH MODERATE LOW MODERATE MODERATE 21 1087 NEW BOSTON Lull Rd unk MODERATE HIGH MODERATE LOW MODERATE MODERATE 21 987 NEW BOSTON Bedford Bog Brook HIGH LOW MODERATE MODERATE MODERATE HIGH 22 1194 NEW BOSTON Francestown Tpk Lords Brook HIGH LOW MODERATE MODERATE MODERATE MODERATE 22 1086 NEW BOSTON Beard Rd unk LOW Unable to Score HIGH LOW MODERATE LOW 25 778 NEW BOSTON Dennison Road unk LOW Unable to Score HIGH LOW MODERATE LOW 25 995 NEW BOSTON Bedford rd Bog Brook LOW Unable to Score LOW MODERATE MODERATE LOW 26 SADES_ID Town Road Stream Owner AOP GC STR C R Data Score Risk Level Red Listed Town CIP 10‐year Road Plan Structural Reinspection Replaced with Replacement date Replacement cost Local ID 1005 NEW BOSTON Bedford Rd Bog Brook Unable to Score LOW MODERATE MODERATE LOW 26 1216 NEW BOSTON New Rd Piscataquog HIGH Unable to Score MODERATE LOW MODERATE LOW 27 1201 NEW BOSTON Meadow Rd Meadow Brook HIGH Unable to Score MODERATE LOW MODERATE LOW 27 800 NEW BOSTON Lyndeborough Road Meadow Brook HIGH LOW HIGH LOW LOW HIGH 28 1193 NEW BOSTON Lyndborough Cold Brook HIGH LOW HIGH LOW LOW MODERATE 28 1069 NEW BOSTON Bunker Hill Rd currier brook LOW LOW HIGH LOW LOW MODERATE 28 996 NEW BOSTON Carriage rd Bog Brook MODERATE HIGH LOW LOW LOW MODERATE 29 1209 NEW BOSTON Meadow Rd Meadow MODERATE HIGH LOW LOW LOW LOW 29 5276 NEW BOSTON Byam Rd Piscataquog HIGH HIGH LOW LOW LOW LOW 29 804 NEW BOSTON Old Coach Piscataquog MODERATE Unable to Score LOW LOW LOW LOW 30 1218 NEW BOSTON Old Coach Rd Piscataquog Unable to Score LOW LOW LOW LOW 30 805 NEW BOSTON Butterfield Mill Rd piscataquog HIGH Unable to Score LOW LOW LOW LOW 30 5278 NEW BOSTON Byam Rd unk HIGH MODERATE MODERATE LOW LOW MODERATE 31 1223 NEW BOSTON Pearson Ln Piscataquog HIGH MODERATE MODERATE LOW LOW MODERATE 31 1202 NEW BOSTON McCollum Piscataquog HIGH MODERATE MODERATE LOW LOW MODERATE 31 1084 NEW BOSTON Dodge rd unk MODERATE MODERATE MODERATE LOW LOW LOW 31 1128 NEW BOSTON scobie rd whiting brook MODERATE LOW MODERATE LOW LOW MODERATE 32 1003 NEW BOSTON Indian Falls Rd Bog Brook MODERATE LOW MODERATE LOW LOW MODERATE 32 999 NEW BOSTON Carriage Rd Bog Brook MODERATE LOW MODERATE LOW LOW MODERATE 32 998 NEW BOSTON Carriage Rd Bog Brook MODERATE LOW MODERATE LOW LOW MODERATE 32 5236 NEW BOSTON Tucker Mill Rd. Middle Branch MODERATE MODERATE LOW LOW LOW LOW 33 1195 NEW BOSTON Francestown Turnpike Lords Brook HIGH LOW LOW MODERATE LOW HIGH 35 990 NEW BOSTON Bedford Bog Brook LOW LOW LOW MODERATE LOW HIGH 35 1238 NEW BOSTON bedford rd Piscataquog HIGH LOW LOW MODERATE LOW MODERATE 35 1240 NEW BOSTON Byam Piscataquog HIGH LOW LOW LOW LOW MODERATE 36 1196 NEW BOSTON Joe English Rd Meadow Brook HIGH LOW LOW LOW LOW MODERATE 36 1191 NEW BOSTON New Rd cold Brook HIGH LOW LOW LOW LOW MODERATE 36 5237 NEW BOSTON Colburn Rd. Middle Branch MODERATE LOW LOW LOW LOW LOW 36 1006 NEW BOSTON Bog Brook Rd Bog Brook MODERATE LOW LOW LOW LOW LOW 36 1001 NEW BOSTON McCurdy Rd Bog Brook HIGH LOW LOW LOW LOW LOW 36 CULVERT PRIORITIZATION MODEL DECEMBER 2016 PISCATAQUOG RIVER WATERSHED, NEW HAMPSHIRE
APPENDIX G
WEARE
WEARE Culvert Summary Data November 1, 2016
Risk and Priority Data
Culvert Risk Risk Data Level
50 50
45 45 41 40 37 40 34 35 35 32 30 30 26 Culverts Culverts
24 of of 25 25
20 20 Number Number 15 15
10 10
5 5
0 0 HIGH MODERATE LOW HIGH MODERATE LOW
Screen Score Screen Score
Culvert Priority (1 = High) 15
13
11 10 9 9 9 8 Culverts
of 7
5 5 5 4 4 4 4 Number 3 3 3 3 33 3 2 2 2 2 2 2 1 1 1 1 1 1 000 0 0 00 0 0
‐1 123456789101112131415161718192021222324252627282930313233343536 Priority Level WEARE Culvert Summary Data November 1, 2016
Variable Data
Geomorphic Compatibility Structural Condition / Hydraulic Capacity
50 50
45 45
40 37 40 35 35
30 30 Culverts Culverts 25 25 25
of of 25 25
20 20 16 Number Number 15 15
10 10
5 5
0 0 HIGH MODERATE LOW HIGH MODERATE LOW
Screen Score Screen Score
Criticality Aquatic Organism Passage
50 50
45 45 43
40 40 34 35 35
30 30 27
Culverts Culverts 25
of 25 of 25
20 20
Number 15 12 Number 15 10 10
5 5
0 0 HIGH MODERATE LOW HIGH MODERATE LOW
Screen Score Screen Score Select Town: Weare
SADES_ID Town Road Stream Owner AOP GC STR C R Data Score Risk Level Red Listed Town CIP 10‐year Road Plan Structural Reinspection Replaced with Replacement date Replacement cost Local ID 5187 WEARE Mountain Rd. Buxton Brook MODERATE HIGH HIGH HIGH HIGH HIGH 1 1068 WEARE poor farm road currier brook MODERATE HIGH HIGH HIGH HIGH HIGH 1 928 WEARE River Rd unk MODERATE HIGH HIGH HIGH HIGH HIGH 1 5281 WEARE reservoir road Piscataquog Trib Municipal MODERATE HIGH HIGH HIGH HIGH MODERATE 1 1114 WEARE Deering Center Road Peacock Brook NH DOT LOW HIGH HIGH HIGH HIGH MODERATE 1 1094 WEARE Gen Knox Rd unk MODERATE HIGH HIGH HIGH HIGH MODERATE 1 1070 WEARE rte 149 hillside brook NH DOT MODERATE HIGH HIGH HIGH HIGH MODERATE 1 1111 WEARE Deering Center Road Peacock Brook NH DOT MODERATE HIGH HIGH HIGH HIGH LOW 1 1093 WEARE rte 149 Meadow Brook NH DOT LOW HIGH HIGH HIGH HIGH LOW 1 1072 WEARE Oak Hill RD Hillside Brook LOW MODERATE HIGH HIGH HIGH HIGH 2 1065 WEARE Cram Buxton Brook LOW MODERATE HIGH HIGH HIGH HIGH 2 909 WEARE Center Rd unk NH DOT MODERATE MODERATE HIGH HIGH HIGH HIGH 2 908 WEARE N John Stark Highway Breed Brook NH DOT HIGH MODERATE HIGH HIGH HIGH HIGH 2 937 WEARE River Rd Piscataquog HIGH HIGH MODERATE HIGH HIGH HIGH 3 5224 WEARE Forest Rd Meadow Brook MODERATE HIGH HIGH MODERATE HIGH LOW 4 921 WEARE reservoir rd unk Municipal MODERATE HIGH HIGH MODERATE HIGH LOW 4 1095 WEARE rt 114 unk NH DOT LOW LOW HIGH HIGH HIGH HIGH 5 1112 WEARE Deering Center Road Peacock Brook NH DOT LOW LOW HIGH HIGH HIGH MODERATE 5 901 WEARE Duck Pond Rd Breed Brook Municipal MODERATE LOW HIGH HIGH HIGH MODERATE 5 927 WEARE concord stage rd unk NH DOT HIGH HIGH LOW HIGH HIGH MODERATE 6 903 WEARE Flanders Memorial Hwy Breed Brook HIGH HIGH LOW HIGH HIGH LOW 6 932 WEARE river rd Piscataquog HIGH MODERATE MODERATE HIGH HIGH HIGH 7 5188 WEARE Driveway mailbox 495 off RtMeadow Brook Private MODERATE MODERATE MODERATE HIGH HIGH MODERATE 7 1110 WEARE Deering Center Rd Peacock Brook NH DOT MODERATE MODERATE MODERATE HIGH HIGH MODERATE 7 906 WEARE East Rd Breed Brook MODERATE MODERATE HIGH MODERATE HIGH MODERATE 8 897 WEARE Mt William Pond Rd Breed Brook HIGH MODERATE HIGH MODERATE HIGH LOW 8 1102 WEARE twin bridge rd otter brook LOW LOW HIGH MODERATE HIGH HIGH 9 929 WEARE Peaslee Piscataquog MODERATE LOW HIGH MODERATE HIGH MODERATE 9 924 WEARE Center Brook Piscataquog MODERATE LOW HIGH MODERATE HIGH MODERATE 9 907 WEARE East Breed Brook HIGH Unable to Score HIGH HIGH HIGH MODERATE 10 900 WEARE S John Stark Hwy Breed Brook NH DOT Unable to Score HIGH HIGH HIGH MODERATE 10 1101 WEARE rte 114 otter brook NH DOT MODERATE Unable to Score HIGH HIGH HIGH LOW 10 904 WEARE Flanders Memorial Hwy Breed Brook MODERATE Unable to Score HIGH HIGH HIGH LOW 10 5213 WEARE Old Francestown Rd. Peacock Brook LOW HIGH HIGH LOW MODERATE HIGH 14 5247 WEARE Peacock Hill Rd. Peacock Brook HIGH HIGH HIGH LOW MODERATE HIGH 14 1290 WEARE Winslow Rd Piscataquog HIGH HIGH HIGH LOW MODERATE MODERATE 14 1089 WEARE MapleWold Meadow Brook LOW HIGH HIGH LOW MODERATE MODERATE 14 933 WEARE East Weare Rd Piscataquog LOW HIGH HIGH LOW MODERATE MODERATE 14 1253 WEARE Colby Huse Brook HIGH HIGH HIGH LOW MODERATE LOW 14 1098 WEARE Melvin Valley Rd otter brook MODERATE HIGH HIGH LOW MODERATE LOW 14 1091 WEARE Maplewold Road Meadow Brook LOW HIGH HIGH LOW MODERATE LOW 14 936 WEARE River rd Piscataquog HIGH LOW MODERATE HIGH MODERATE HIGH 15 1073 WEARE Oak Hill Rd Hillside Brook HIGH LOW MODERATE HIGH MODERATE HIGH 15 920 WEARE rte 114 Piscataquog Trib NH DOT HIGH LOW MODERATE HIGH MODERATE HIGH 15 1259 WEARE River Rd/Clough Park Rd Piscataquog MODERATE MODERATE LOW HIGH MODERATE HIGH 16 899 WEARE Pond View Breed Brook HIGH MODERATE LOW HIGH MODERATE LOW 16 898 WEARE Mt. William Pond Rd Breed Brook MODERATE MODERATE MODERATE MODERATE MODERATE MODERATE 18 5182 WEARE Irving Rd (Reach 5, Culvert 2 Meadow Brook MODERATE MODERATE MODERATE MODERATE MODERATE LOW 18 902 WEARE Duck Pond Breed Brook HIGH HIGH LOW MODERATE MODERATE MODERATE 19 5214 WEARE Lull Road Peacock Brook MODERATE MODERATE HIGH LOW MODERATE HIGH 20 1291 WEARE page hill rd Piscataquog MODERATE MODERATE HIGH LOW MODERATE MODERATE 20 1097 WEARE Bart Clough Rd Otter Brook LOW MODERATE HIGH LOW MODERATE MODERATE 20 1067 WEARE Poor Farm Rd Currier Brook MODERATE MODERATE HIGH LOW MODERATE MODERATE 20 1066 WEARE Poor Farm Rd Currier Brook MODERATE MODERATE HIGH LOW MODERATE MODERATE 20 1255 WEARE Clough Park Rd Piscataquog MODERATE HIGH MODERATE LOW MODERATE HIGH 21 1092 WEARE Mount Dearborn Road Meadow Brook LOW HIGH MODERATE LOW MODERATE HIGH 21 915 WEARE Craney Hill Road Piscataquog HIGH HIGH MODERATE LOW MODERATE MODERATE 21 5284 WEARE Mt. Dearborn Rd Peacock Brook Municipal LOW HIGH MODERATE LOW MODERATE LOW 21 5241 WEARE Rt 149 Peacock Brook NH DOT LOW HIGH MODERATE LOW MODERATE LOW 21 1096 WEARE gould rd Meadow Brook MODERATE HIGH MODERATE LOW MODERATE LOW 21 SADES_ID Town Road Stream Owner AOP GC STR C R Data Score Risk Level Red Listed Town CIP 10‐year Road Plan Structural Reinspection Replaced with Replacement date Replacement cost Local ID 1107 WEARE Shady Hill Road Peacock Brook LOW LOW MODERATE MODERATE MODERATE HIGH 22 923 WEARE Center Rd Piscataquog NH DOT Unable to Score MODERATE MODERATE MODERATE LOW 24 1254 WEARE Colby Huse Brook HIGH Unable to Score HIGH LOW MODERATE LOW 25 1108 WEARE Hodgdon Road Peacock Brook LOW Unable to Score HIGH LOW MODERATE LOW 25 1106 WEARE Shady Hill Rd Peacock Brook MODERATE Unable to Score HIGH LOW MODERATE LOW 25 1105 WEARE Shady Hill Rd Peacock Brook MODERATE Unable to Score HIGH LOW MODERATE LOW 25 1081 WEARE Twin Bridge Rd Piscataquog LOW Unable to Score HIGH LOW MODERATE LOW 25 1103 WEARE twin bridge rd otter brook MODERATE LOW HIGH LOW LOW HIGH 28 1292 WEARE Waterman Rd Piscataquog MODERATE LOW HIGH LOW LOW MODERATE 28 1258 WEARE Chuck Piscataquog HIGH LOW HIGH LOW LOW MODERATE 28 1256 WEARE High Rock Rd Piscataquog LOW LOW HIGH LOW LOW MODERATE 28 1115 WEARE Maplewold Rd Peacock Brook LOW LOW HIGH LOW LOW MODERATE 28 917 WEARE Quaker Piscataquog HIGH LOW HIGH LOW LOW MODERATE 28 910 WEARE Sewell‐Hoyt Choate Brook MODERATE LOW HIGH LOW LOW MODERATE 28 869 WEARE Huntington Hill Piscataquog HIGH LOW HIGH LOW LOW MODERATE 28 5215 WEARE Hodgdon Rd. Peacock Brook LOW LOW HIGH LOW LOW LOW 28 5246 WEARE Hodgdon Rd. Peacock Brook MODERATE HIGH LOW LOW LOW LOW 29 1113 WEARE Mt Dearborn Road Peacock Brook MODERATE HIGH LOW LOW LOW LOW 29 896 WEARE PondView Rd Breed Brook HIGH HIGH LOW LOW LOW LOW 29 1109 WEARE Hodgdon Rd Peacock brook HIGH MODERATE MODERATE LOW LOW MODERATE 31 914 WEARE E Shore Rd Piscataquog MODERATE MODERATE MODERATE LOW LOW LOW 31 912 WEARE Craney Hill rd Piscataquog HIGH MODERATE MODERATE LOW LOW LOW 31 5274 WEARE East Shore DR Piscataquog Trib MODERATE LOW MODERATE LOW LOW MODERATE 32 1257 WEARE High Rock Rd Piscataquog LOW LOW MODERATE LOW LOW MODERATE 32 1100 WEARE Colby Rd Otter Brook MODERATE MODERATE LOW LOW LOW MODERATE 33 1090 WEARE Maplewold Road Meadow Brook LOW MODERATE LOW LOW LOW MODERATE 33 931 WEARE Peaslee Hill rd Piscataquog HIGH MODERATE LOW LOW LOW MODERATE 33 5183 WEARE Bogue Road Buxton Brook MODERATE MODERATE LOW LOW LOW LOW 33 939 WEARE rte 77 Stark Brook NH DOT HIGH LOW LOW HIGH LOW HIGH 34 5223 WEARE Route 77 (Reach 1C) Meadow Brook NH DOT MODERATE LOW LOW HIGH LOW MODERATE 34 1099 WEARE barnard hill rd otter brook HIGH LOW LOW LOW LOW MODERATE 36 CULVERT PRIORITIZATION MODEL DECEMBER 2016 PISCATAQUOG RIVER WATERSHED, NEW HAMPSHIRE
APPENDIX H
OTHER TOWNS WITH FEW ASSESSED CULVERTS IN THE WATERSHED
Select Town: Bedford
SADES_ID Town Road Stream Owner AOP GC STR C R Data Score Risk Level Red Listed Town CIP 10‐year Road Plan Structural Reinspection Replaced with Replacement date Replacement cost Local ID 988 BEDFORD Pulpit Bog Brook MODERATE HIGH MODERATE LOW MODERATE MODERATE 21 989 BEDFORD Pulpit Bog Brook MODERATE LOW LOW LOW LOW MODERATE 36 Select Town: Greenfield
SADES_ID Town Road Stream Owner AOP GC STR C R Data Score Risk Level Red Listed Town CIP 10‐year Road Plan Structural Reinspection Replaced with Replacement date Replacement cost Local ID 1169 GREENFIELD Francestown Road, Rte 136 Rand Brook NH DOT HIGH LOW MODERATE HIGH MODERATE HIGH 15 1171 GREENFIELD East rd Rand Brook HIGH MODERATE HIGH LOW MODERATE MODERATE 20 5273 GREENFIELD Greenfield Rd Rand Brook HIGH LOW HIGH LOW LOW MODERATE 28 Select Town: Manchester
SADES_ID Town Road Stream Owner AOP GC STR C R Data Score Risk Level Red Listed Town CIP 10‐year Road Plan Structural Reinspection Replaced with Replacement date Replacement cost Local ID 1058 MANCHESTER Rockland Rockland Creek HIGH HIGH HIGH HIGH LOW 1 CULVERT PRIORITIZATION MODEL DECEMBER 2016 PISCATAQUOG RIVER WATERSHED, NEW HAMPSHIRE
APPENDIX I
LOCAL FLOOD RISK INFORMATION IN THE PISCATAQUOG RIVER WATERSHED
! !
! ! ! ! !
!
Dee 6 r Ln d 4
R 3 Pleasant Pond r m
2 d 8 0 D P n ! - 2 o B N k i t o n
o 2 R N c c ! i P o e . B a b C l s m 8 e 0 l r 0.5 1 2 y U r m e H H 8 a e e a e m ! !
d a l t Legend d h i H n H l ) d H P o i l U l R l e f l u R as e i o
a 2 d n R l l N t p o Q y Miles l P l D o r i
n r !
0 d p d d P o R R u d e H H b G ! 8 r B N a ! d C C r i
e ( r l 6 e HENNIKER c k
! i l Project Culverts d a C a i b e e R s a
m :
a 7 r N e e R r No g m a s n id t r N d R e o r a x
e 6 o n d t Pi e o R n B e S n m
n a d e 5 r t N S F hedd Brook d e d S R v y 0 R
t re R A oo e ir a M t a Local Flood Risks (2015) n l H
4 d e d B d m 5 ! m T
i a e a R l e 3 r l V r t e
) N D S R t t e d 3 t S a or , n o c m n d n Rd i l e 8 er il S t S Bould a it o High y -
h M N H c Dr o ( W on r h Nort P l C 2 n N p o i
h u Rt 9 am o i f r h l t 8 Dudley Pond b f a u S m O S 8 r t . EB r r c ) Medium e 2 e ! M
0 h k n ! w t
2 i L 2 . S n t y S r a
U HILLSBOROUGH 0 n r S N e S w ! t e e o Na P m m 8 H iv e E R a 1 W ( w W Way t Low est vey te M ar r a W H N n ill Rd in S ind Sawm Keith Rd t s D o o B ! r S Te l t ! d! a r S r N D t w a c o R M t e o p p ! a a il i S os k n! W Stream (Order) l s r m R c l F (beaver in area) a i P n i l L d c i s R t C m l ese n r e ! o v B e o e o N r ir D M S d w r ! u h C a o S m m t r o R e ! R ! ! ncord S id a l t tage s n d r d e a l ! Rd W M t i a s c b e o g s N i h H M d o e e n W G o n o S W n R ! J w o e d N U S i H o Pa r o s t n d r ige a d Hil h h N t B l R d e i d n
n s N St l b e ll l d a
i r 1N 2 3 4 5 6 7 8
o H u w R R v C r o
r e t i i o h d r c H d e y t n R
B h w a D d a R n , m r w R a bo e o o n Ox r D s d p A l r W e c d o s M r n Waterbody s h R N i
n h ,
h M N R r R o R d S d i t i a N g S s l r i e r a e v l n m n ta d o i s k e i e e c m E ! T r S e o d rk n
M l d b v ill R n n p t H i i t o H l en a r W l m l R
o ! k a e Cle r L w e y NH DOT Roads e m R n d r S s y c
B t t an d in ! i l f n h a R h ! ol w ! d t e ! o
o ! R d i C
p L W s
T !
R d m R a a D t , !
Interstate a i S k ,
c r s k n e u e e d a e v s y W r s t H i m m e s
i a l l A d ! e H w e a R l O d Q D -
l e ! D R
C i l
l l d Pu rincipal Arterial r l r D t S
d t e a G l r i T R
b E !
s r S u L g o k
n O e R M r d e :
a e - o D
n v u )
t n Weare Reservoir t d S l i t t a p r r l i d e
n H
k T e R i g a S
o R u u
d S I k Q T ll ( y i e Collector
e N C H C t h
e N
d E D R d R ! / ! o F ! - o v S R A d o C r n d r L W A n
s y C R
d r N R an e ! t r t d d t B e ! P G P i o
o U !
Local W k R !
o c e H ! O N O
w S B R S N T g r S n a d d k o n o R c Piscataquog River Watershed Boundary L D o h r r B ! F, B u R e d ! d e E b d e r l r H
e D u B
o y D Town Boundaries h
e l u T l e B d y
l r ! r e H O, F (dam) i n y o ! N i g l o B
l e d r W (road) k F R o R o w ! ! Winterberry Ln a O d k s R r R m d l N d o G d d !
o o C R l W (road) e N W o W d n Culvert Issues (Bold) ! u a g N o R n n m o o t d y d e d L O R f F = Past or potential flooding R e T I l y l d r i i a f n
f T d H a
R W n f l D = Unspecified damage R d !
d A ill R s y o s H Go l ld bb ve R Tu d e H M W D Z e G
i Abijah Bridge Rd D i r l I o ! l F r W = Washout i ! e s u R
c T n g o d g I
e t l t a l i H O = Overtopping i R
d n R
S i R l d V l ) T WEARE y S R ha !
O ! i dy e e d H O ill R d !X = Fdailure I n ! 5 t w ! R ! ! i D Rd d l h oria L R o m 1 H o Me ! W n ! ers
N w d
F B = Blocnked by Debris 0 ld Fla P ! i ! F 2 ! W
T R
d N
R I
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! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !
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! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !! ! ! ! ! ! ! ! ! ! ! ! ! ! !
!
! CULVERT PRIORITIZATION MODEL DECEMBER 2016 PISCATAQUOG RIVER WATERSHED, NEW HAMPSHIRE
APPENDIX J
CONCEPT DESIGNS FOR HIGH PRIORITY CULVERTS IN FRANCESTOWN AND GOFFSTOWN
Dodge Hill Road (SADES ID 803) Unnamed Tributary to South Branch Piscataquog River Francestown, New Hampshire
Unnamed Trib to STREAM NAME South Branch Piscataquog River ROAD INFORMATION: NH Tier 5, Paved, two lanes ROAD NAME Dodge Hill Road # OF CULVERTS: 1 TOWN Francestown, NH CULVERT SHAPE: Round SADES_ID 803 MATERIAL: Steel‐corrugated LATITUDE: 42.961792 CULVERT LENGTH (FT): 38.5 LONGITUDE: ‐71.751541 CULVERT WIDTH (FT): 4.0 RISK High CULVERT HEIGHT (FT): 4.0 DATA LEVEL High CULVERT SLOPE RELATIVE TO CHANNEL: Same GEOMORPHIC COMPATIBLITY ISSUES Unable to Score SKEW TO ROAD: Not Listed STRUCTURE CONDITION ISSUES High BANKFULL WIDTH (FT): 6 to 15 CRITICALITY High STRUCTURE WIDTH / BANKFULL WIDTH (%): 38.1 AQUATIC ORGANISM PASSAGE PRIORITY High APPROXIMATE FLOOD CAPACITY: > 100‐year flood
Culvert Outlet on West Side of Road: Culvert Inlet on East Side of Road:
The culvert is located in a wetland setting, with mapped wetlands upstream and downstream. There is a history of washouts and the culvert is severely decayed at each end. The channel bankfull width is in the range of 6 feet to 15 feet wide based on measurements at the site. Hydraulic geometry curves predict a 10‐foot wide channel based on the upstream drainage area of approximately 0.6 square miles. The culvert screening data and channel measurements may not accurately reflect field conditions due to the presence of wetlands and possible beaver dams temporarily impounding the channel.
It is recommended that the culvert be replaced with a 10‐foot wide by 6‐foot tall precast concrete box culvert. The concept design selects a moderate bankfull width of 10 feet to size the culvert. A concrete box culvert has been chosen to accommodate the small amount of cover available over the structure. The proposed structure would be embedded below the existing stream bed to accommodate passage of sediment and debris, and allow for aquatic organisms. The culvert length should be increased to 40 feet to allow reconstruction of the stone headwall. Purchase and installation of this culvert is estimated to cost $100,000. If required, contracting services for design, permitting, bid assistance, and construction oversight assistance are estimated to cost $30,000.
Piscataquog River Watershed Culvert Prioritization Model 0 25 50 100 Feet
SOURCE(S): DODGE HILL ROAD CULVERT (SADES ID 803) LOCATION: MMI CULVERT SCREEN UNNAMED TRIBUTARY TO FRANCESTOWN, NH BING AERIAL SOUTH BRANCH PISCATAQUOG RIVER Map By: JCL PISCATAQUOG RIVER WATERSHED MMI#: 4040-02 CULVERT PRIORITIZATION Original: 11/30/2016 1 S. Main Street Waterbury, VT 05676 Revision: (802) 882-8335 Fax: (802) 882-8346 Scale: SEE SCALE BAR www.miloneandmacbroom.com ³ MXD: Y:\4040-02\Maps\ConceptDesigns\Francestown_CONCEPT_803.mxd Stinson Road (SADES ID 4880) Unnamed Tributary to Harry Brook Goffstown, New Hampshire
Unnamed Trib to STREAM NAME Harry Brook ROAD INFORMATION: NH Tier 5, Paved, two lanes ROAD NAME Stinson Road # OF CULVERTS: 2 TOWN Goffstown, NH CULVERT SHAPE: Round SADES_ID 4880 MATERIAL: Steel‐corrugated LATITUDE: 43.044477 CULVERT LENGTH (FT): 29.0 LONGITUDE: ‐71.591272 CULVERT WIDTH (FT): 2.0 RISK High CULVERT HEIGHT (FT): 1.5 DATA LEVEL Low CULVERT SLOPE RELATIVE TO CHANNEL: Same GEOMORPHIC COMPATIBLITY ISSUES Unable to Score SKEW TO ROAD: Water Body Upstream STRUCTURE CONDITION ISSUES High BANKFULL WIDTH (FT): 5 to 8 CRITICALITY High STRUCTURE WIDTH / BANKFULL WIDTH (%): 30.8 AQUATIC ORGANISM PASSAGE PRIORITY Moderate APPROXIMATE FLOOD CAPACITY: N/A
Culvert Outlet: Road Surface and Wetland Area Upstream of Culvert:
The culvert is located in a wetland setting where debris and dams from beavers occasionally clog the culvert. The road is narrow and low in this area and the road is reported to fall apart quickly due to lack of good base material. There is a history of the road being overtopped at this location. The channel bankfull width is in the range of 5 feet to 8 feet based on field measurements. Hydraulic geometry curves predict an 8‐foot wide channel based on the upstream drainage area of approximately 0.4 square miles. No bankfull measurements were completed upstream or at a reference location. Immediately upstream of the culvert is a large pond that is mapped as a wetland and controlled by a large beaver dam.
It is recommended that the culvert be replaced with an 8 foot wide by 5 foot tall precast concrete box culvert. When the upstream beaver dam fails, a large amount of water will rush into this culvert. As a conservative approach, the culvert has been sized at the high end of the bankfull width range. A concrete box culvert has been chosen to accommodate the small amount of cover available over the structure. The proposed structure would be embedded below the existing stream bed to accommodate passage of sediment and debris, and support aquatic organism passage. The length of the culvert should be increased to 35 feet to allow for additional shoulder width and stone masonry headwall reconstruction. Purchase and installation of this culvert is estimated to cost $80,000. If required, contracting services for design, permitting, bid assistance, and construction oversight assistance are estimated to cost $20,000.
Piscataquog River Watershed Culvert Prioritization Model 0 12.5 25 50 Feet
SOURCE(S): LOCATION: STINSON ROAD CULVERT (SADES ID 4880) MMI CULVERT SCREEN GOFFSTOWN, NH BING AERIAL UNNAMED TRIBUTARY TO HARRY BROOK
Map By: JCL PISCATAQUOG RIVER WATERSHED MMI#: 4040-02 CULVERT PRIORITIZATION Original: 11/30/2016 1 S. Main Street Waterbury, VT 05676 Revision: (802) 882-8335 Fax: (802) 882-8346 Scale: SEE SCALE BAR www.miloneandmacbroom.com ³ MXD: Y:\4040-02\Maps\ConceptDesigns\Goffstown_CONCEPT_4880.mxd