DOCSLIB.ORG

This Stormwater Management Plan Is Organized According to the Permit

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
This Stormwater Management Plan Is Organized According to the Permit NPDES MS4 Permit Renewal Application Package February 28, 2017 Cover: Aerial View of Oswego, Oregon, 1956. Photo courtesy of the Lake Oswego Library. Lake Oswego MS4 Permit Renewal Package 2017 City of Lake Oswego, Oregon National Pollutant Discharge Elimination System Municipal Separate Storm Sewer System Permit 2017 Permit Renewal Application Package Prepared for the Oregon Department of Environmental Quality February 28, 2017 This page intentionally left blank. Lake Oswego MS4 Permit Renewal Package 2017 City of Lake Oswego NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES) MUNICIPAL SEPARATE STORM SEWER SYSTEM PERMIT RENEWAL APPLICATION PACKAGE February 28, 2017 I, the undersigned, hereby submit this National Pollutant Discharge Elimination System (NPDES) Municipal Storm Water System Permit Renewal Application Package in accordance with NPDES Permit Number 101348. I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person, or persons, who manage the system, or those persons directly responsible for gathering the information, the information is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for known violations. ________________________________ Name: Scott D. Lazenby Title: City Manager City of Lake Oswego i This page intentionally left blank. Lake Oswego MS4 Permit Renewal Package 2017 Table of Contents List of Figures ..................................................................................................................................... v List of Tables ...................................................................................................................................... v List of Abbreviations ......................................................................................................................... vi Section 1 Introduction and Overview ............................................................................................... 1-1 1.1 Permit Overview .......................................................................................................................... 1-1 1.2 Description of Permit Area and Coordination with Co-Permittees ............................................. 1-2 1.2.1 Description of City of Lake Oswego Permit Area ............................................................. 1-2 1.2.2 Summary of Clackamas County Co-permittees ............................................................... 1-2 1.2.3 Summary of City Coordination with Co-Permittees ........................................................ 1-2 1.3 Organization of Document .......................................................................................................... 1-2 Section 2 Maximum Extent Practicable Evaluation ........................................................................... 2-1 2.1 How the Existing Stormwater Management Program Addressed 2012 Permit Requirements .. 2-1 2.1.1 Annual Adaptive Management ........................................................................................ 2-2 2.1.2 Results of the Existing MEP Program Evaluation ............................................................. 2-2 2.2 How the Proposed Stormwater Management Program Meets the MEP Requirement ............. 2-8 Section 3 Proposed Modifications to the Stormwater Management Plan .......................................... 3-1 Section 4 Service Area Expansions and Total Annual Pollutant Load Updates .................................... 4-1 4.1 Introduction ................................................................................................................................. 4-1 4.2 Description of Projected Service Area Expansions ...................................................................... 4-1 4.2.1 Definition of the City’s NPDES MS4 Permit Area ............................................................. 4-1 4.2.2 Identification of Projected Service Area Expansions ....................................................... 4-2 4.3 Updated Estimate of Total Annual Pollutant Loads .................................................................... 4-3 4.3.1 Modeling Methods and Assumptions .............................................................................. 4-3 4.3.2 Updated Estimate of Total Annual Pollutant Loads ......................................................... 4-6 4.4 Qualitative Evaluation ................................................................................................................. 4-7 4.4.1 Service Area Expansion .................................................................................................... 4-7 4.4.2 Pollutant Loads Discharge ................................................................................................ 4-7 4.4.3 Conclusion ........................................................................................................................ 4-8 Section 5 Wasteload Allocations and Benchmarks ............................................................................ 5-1 5.1 BMP Identification ....................................................................................................................... 5-2 5.2 TMDL Benchmark Results and Discussion ................................................................................... 5-3 iii Lake Oswego MS4 Permit Renewal Package 2017 Section 6 Fiscal Evaluation............................................................................................................... 6-1 6.1 Fiscal Evaluation .......................................................................................................................... 6-1 6.1.1 Expenditures for the Current Permit Cycle 2012-2017 ................................................... 6-1 6.1.2 Expenditures for the Upcoming Permit Cycle .................................................................. 6-2 Section 7 Monitoring Program Objectives and Modifications ........................................................... 7-1 7.1 Proposed Changes ....................................................................................................................... 7-1 7.1.1 Ambient Instream Monitoring ......................................................................................... 7-1 7.1.2 Wet Weather Stormwater Monitoring ............................................................................ 7-2 7.1.3 Other Environmental Monitoring .................................................................................... 7-2 Appendix A: Stormwater Management Plan Appendix B: Public Comments and Response to Comments Appendix C: TMDL Pollutant Load Reduction Evaluation and Benchmarks Appendix D: Monitoring Plan Appendix E: MS4 Maps iv Lake Oswego MS4 Permit Renewal Package 2017 List of Figures Figure 4-1. Lake Oswego annexations (2000 – present) ............................................................................ 4-3 Figure 6-1. Relative stormwater expenditures over the current permit cycle 2012-2017 ........................ 6-4 Figure 6-2. Regulatory compliance level of effort over the current permit cycle 2012-2017 by functional activity ......................................................................................................................... 6-4 List of Tables Table 1-1. Permit Renewal Submittal Components ................................................................................... 1-3 Table 2-1. Status of City Actions On 2012 NPDES MS4 Permit Requirements .......................................... 2-3 Table 4-1. Land Use EMC Values used in the Total Annual Pollutant Load Estimate ................................ 4-4 Table 4-2. Modeled Area by Land Use and Impervious Percentage .......................................................... 4-6 Table 4-3. Updated Annual Estimate of Pollutant Loads for the City of Lake Oswego .............................. 4-6 Table 5-1. Lake Oswego Applicable WLAs ................................................................................................. 5-1 Table 5-2. Projected Stormwater Facilities and Drainage Areas for 2022 Benchmarks ............................ 5-3 Table 5-3. TMDL Benchmarks for 2017–2022 ............................................................................................ 5-3 Table 6-1. Surface Water Utility Fiscal Status, Current MS4 Permit 2012-2017 ....................................... 6-3 Table 6-2. Projected Surface Water Utility Fiscal Status, Upcoming MS4 Permit Term 2017-2022 ......... 6-3 Table 7-1. Monitoring Objective Matrix .................................................................................................... 7-3 v Lake Oswego MS4 Permit Renewal Package 2017 List of Abbreviations µg microgram(s) ac acre(s) ACWA Association of Clean Water Agencies BOD5 5-day biochemical oxygen demand CFU colony-forming unit(s) City City of Lake Oswego COD chemical oxygen demand COM commercial DEQ Department of Environmental Quality DO dissolved oxygen EMC event mean concentration EPA U.S. Environmental Protection Agency IND industrial L liter(s) lb pound(s) LCL lower confidence level LUCS Land Use Compatibility Statement MFR multi-family residential mg/L milligram(s) per
Load more

Recommended publications
  • A Description of Hydrogeologic Units in the Portland Basin, Oregon and Washington
    A DESCRIPTION OF HYDROGEOLOGIC UNITS IN THE PORTLAND BASIN, OREGON AND WASHINGTON U.S. GEOLOGICAL SURVEY Water-Resources Investigations Report 90-4196 Prepared in cooperation with CITY OF PORTLAND BUREAU OF WATER WORKS, INTERGOVERNMENTAL RESOURCE CENTER and OREGON WATER RESOURCES DEPARTMENT A DESCRIPTION OF HYDROGEOLOGIC UNITS IN THE PORTLAND BASIN, OREGON AND WASHINGTON By R.D. Swanson, W.D. McFarland, J.B. Gonthier, and J.M. Wilkinson U.S. GEOLOGICAL SURVEY Water-Resources Investigations Report 90-4196 Prepared in cooperation with CITY OF PORTLAND BUREAU OF WATER WORKS, INTERGOVERNMENTAL RESOURCE CENTER, and OREGON WATER RESOURCES DEPARTMENT Portland, Oregon 1993 U.S. DEPARTMENT OF THE INTERIOR BRUCE BABBITT, Secretary U.S. GEOLOGICAL SURVEY Dallas L. Peck, Director For additional information Copies of this report can write to: be purchased from: Oregon Office Chief U.S. Geological Survey U.S. Geological Survey Books and Open-File Reports Section 10615 S.E. Cherry Blossom Drive Federal Center, Box 25425 Portland, OR 97216 Denver, CO 80225 11 CONTENTS Page Abstract --------------------------------------------------------- 1 Introduction ----------------------------------------------------- 1 Purpose and scope ------------------------------------------- 5 Acknowledgments --------------------------------------------- 5 Previous investigations ------------------------------------- 5 Methods of investigation ------------------------------------ 7 Geologic setting ------------------------------------------------- 9 Older rocks -------------------------------------------------
    [Show full text]
  • Living with Urban Coyotes Time to Sign up for Stormwater Stars!
    February 2018 News from Southwest Neighborhoods, Inc. www.swni.org (503) 823-4592 Neighborhood South Portland Wayfinding, 9-1-1 Dispatching 4 Associations Arnold Creek and Emergency Response Improvements Ashcreek The Portland Bureau of solution to eliminate this issue, Current Mailing Address Transportation has been including unincorporated Multnomah Future Mailing Address Bridlemile collaborating with Portland Fire & County areas served by the City. 0715 SW Bancroft Street Collins View Rescue, Portland Police Bureau Wayfinding, 9-1-1 dispatching 715 South Bancroft Street and Multnomah County to improve and emergency response issues Crestwood wayfinding, 9-1-1 dispatching and increase each year as development 3303 SW Moody Avenue Far Southwest emergency response in the area and population growth occurs in 3303 South Moody Avenue Hayhurst of Southwest Portland east of SW the leading zero addressing area, 6331 SW Radcliff Street Naito Parkway. Due to the eastward especially in South Waterfront. Hillsdale 6331 SW Radcliffe Street curvature in the Willamette River, In addition, the spelling of SW Homestead east-west addresses in this area Radcliff/Radcliffe Street and SW Maplewood are currently addressed with a Radcliff/Radcliffe Lane in Crestwood leading zero address to differentiate Markham N.A. outside the leading zero them from addresses west of this addressing area will be standardized. Marshall Park dividing line. About 8% of Southwest The current spelling on property Multnomah Portland addresses are in this owners’ addresses, street
    [Show full text]
  • The Geological Newsletter
    JAN 90 THE GEOLOGICAL NEWSLETTER ·• GEOLOGICAL SOCIETY OF THE OREGON COUNTRY GEOLOGICAL SOCIETY Non-Profit Org. U.S. POSTAGE OF THE OREGON COUNTRY PAID P.O. BOX ?a 7- Portland, Oregon PORTLAND, OR 97207- -:· ·--~··, Permit No. 999 - -- '~ Dr. Frank Boersma 120 W. 33~d Street Vancouver, WA 98660 GEOLOGICAL SOCIETY OF THE OREGOt\ COllNTRY 1989-1990 ADMINISTRATION BOARD OF DIRECTORS President Directors Rosemary Kenney 221-0757 Peter E. Baer (3 years) 661-7995 4211 S\-1 Condor Charlene Holzwarth (2 years) 284-3444 Portland, OR 97201 Esther Kennedy (1 year) 287-3091 Vice President Margaret L. Steere 246-1670 Immediate Past Presidents Joline Robustelli 223-2852 6929 SW 34 Ave. ~ Portland, OR 97219 R.E. (Andy) Corcoran 244-5605 Secretary Alta B. Fosback 641-6323 THE GEOLOGICAL NEWSLETTER 8942 SW Fairview Place Tigard, OR 97223 Editor: Sandra Anderson 775-5538 Treasurer Calendar: Margaret Steere 246-1670 Braden Pillow 659-6318 Business Manager: Carol Cole 220-0078 19562 SE Cottonwood St. Assist: Cecelia Crater 235-5158 Milwaukie, OR 97267 ACTIVITIES CHAIRS Calligrapher Properties and PA System Wallace R.· McClung 637-3834 (Luncheon) Donald Botteron 245-6251 Field Trips (Evening) Walter A. Sunderland 625-6840 Charlene Holzwarth 284-3444 Publications Alta B. Fosback 641-6323 Geneva E. Reddekopp 654-9818 Geology Seminars Publicity Donald D. Barr 246-2785 Roberta L. Walter 235-3579 Historian Refreshments Phyllis G. Bonebrake 289-8597 (Friday Evening) Hospitality David and Marvel Gillespie 246-2368 254-0135 (Luncheon) Margaret Fink 289-0188 Harold and Patricia Gay Moore (Evening) Maxine Harrington 297-ll86 (Geology Seminars) Catherine Evenson 654-2636 Library: Esther Kennedy 287-3091 ' ' Betty Turner 246-3192 Telephone n Past Presidents Panel Jean L.
    [Show full text]
  • Tryon Creek Restoration Monitoring Project
    Restoring Fish Passage in Tryon Creek (OR): Lampreys (NFWF 2006-0175-004) Final Programmatic Report T.A. Whitesel, G.S. Silver, C.W. Luzier, and J.M. Hudson U.S. Fish and Wildlife Service – Columbia River Fisheries Program Office 1211 SE Cardinal Ct – Ste 100 Vancouver, WA 98606 Introduction Tryon Creek is located in southwest Portland and its headwaters are located within those neighborhoods (Figure 1). It flows approximately 5 km through this privately owned land before entering Tryon Creek State Natural Area, a 259 hectare area of public land, through which the stream flows another 5 km. The lower most portion of Tryon Creek flows through public land owned by the City of Lake Oswego and the City of Portland. This portion of the stream is bisected by a culvert that runs under Oregon Highway 43 and a railroad near the mouth of Tryon Creek. Figure 1. Tryon Creek watershed. 1 Tryon Creek is one of the largest, relatively protected, urban watersheds in Oregon. A number of native species can currently be found in this stream including Oncorhynchus mykiss (resident and anadromous) and coastal cutthroat trout (O. clarki) (Tinus et al. 2003) as well as coho salmon (O. kisutch, Hudson et al. 2007) and Chinook salmon (O.tshawytscha) . Historically, it is thought that Pacific lamprey (Entosphenus tridentatus) and western brook lamprey (Lampetra richardsoni) as well as other salmon species also utilized this stream. However, the culvert under Highway 43 and the adjacent railroad is potentially inhibiting, if not preventing, passage of lampreys and salmonids. The Highway 43 culvert was constructed in the late 1920s.
    [Show full text]
  • Watershed Assessment of Tryon Creek of Oregon
    Portland State University PDXScholar Master of Environmental Management Project Reports Environmental Science and Management 12-17-2019 Watershed Assessment of Tryon Creek of Oregon Danielle Goodrich Portland State University Follow this and additional works at: https://pdxscholar.library.pdx.edu/mem_gradprojects Part of the Environmental Indicators and Impact Assessment Commons, and the Environmental Monitoring Commons Let us know how access to this document benefits ou.y Recommended Citation Goodrich, Danielle, "Watershed Assessment of Tryon Creek of Oregon" (2019). Master of Environmental Management Project Reports. 57. https://pdxscholar.library.pdx.edu/mem_gradprojects/57 https://doi.org/10.15760/mem.59 This Project is brought to you for free and open access. It has been accepted for inclusion in Master of Environmental Management Project Reports by an authorized administrator of PDXScholar. Please contact us if we can make this document more accessible: [email protected]. (Source: Barton, A. (2019). Tryon Creek Watershed Council) Watershed Assessment of Tryon Creek of Oregon This document was written in cooperation with the Tryon Creek Watershed Council by Danielle Goodrich as a master’s project for the Professional Science Master of Environmental Science and Management degree at Portland State University, Oregon. 1 Watershed Assessment of Tryon Creek of Oregon Tryon Creek Watershed Council December 17, 2019 Acknowledgements Thank you to all of the board members and partners of the Tryon Creek Watershed Council for providing this project opportunity and for your dedication to stewardship of the watershed. Glen Leverich, Dusty Day, Terri Preeg Riggsby, Alexis Barton, Sharon Keast, Carl Axelsen, Megan Hill, Jennifer Jones, Hannah Machiorlete, and Torrey Lindbo have contributed incomparable efforts to this watershed assessment and Tryon Creek as a whole.
    [Show full text]
  • NOAA Restoration Center Community-Based Restoration
    NOAA Restoration Center OMB Approval No. Community-based Restoration Program (CRP) Expires Progress Report Narrative Format I. Project Title Off-Channel Habitat Enhancement at the Confluence of the Willamette River and Tryon Creek II. Reporting Period Supplemental Final Report - April 1, 2010 – March 1, 2011 III. Project Narrative (this section is required for the final comprehensive report only) Except during large events, lower Tryon Creek was disconnected from its floodplain. The creek was channelized and lined with rock. The primary objective of this project was to enhance critical fish habitat at Tryon Creek’s confluence with the Willamette River. Coho, Chinook, Steelhead and cutthroat have all been found in Tryon Creek in recent years. Through this project, BES expanded shallow water habitat and placed large wood structures on approximately 100 feet of Willamette River shoreline. In the lower 900 feet of Tryon Creek, the project improved channel and floodplain complexity, as well as channel condition and habitat structure. Large wood, boulders and streambed material were added to increase channel roughness and improve channel condition. Floodplain connectivity improved by excavating a portion of the project area, creating a broad floodplain bench along approximately 400 feet of Tryon Creek and laying back the bank along the remainder of the project area. The project also included approximately 3.5 acres of invasive plant management and native revegetation in the surrounding riparian area. Page 1 of 10 IV. Methodology In the spring of 2010, BES awarded a construction contract to Nutter Corporation. Notice to proceed was issued in May 2010. With oversight from BES construction management and inspection staff, Nutter completed the project.
    [Show full text]
  • Special Gorge Appreciation Week Issue
    008Q-Qtz:L6 uo6aJQ 'puO!!JOd 0080t xos ·o·d a6Jo~ o!qwniO) ay1 !O spua!J:I • -- \ .I, - • - - ·-- --·- - - ---. ~-•• -- - -- - FRttENDS OF THE COWl.JMBIA GORGE e lOth Anniversary of the Columbia Gorge National Scenic Area GORGE APPRECIATION WEEK trail restoration hiking and more ... ~ ..... ---- I FRIENDS OF THE COLUMBIA GORGE 1Oth Anniversaty of the Columbia Gor e National Scenic Area GORGE APPRECI~ ION WEEK June 10 - 16, 1996 10th Anniversary Prior sign-up is required. Please he 1Oth Anniversary of the Columbia reserve your place by Monday, Gorge National Scenic Area marks th~ June 3, 1996. See information on T passage of the Columbia River Gorge how to reserve your spot (see box). National Scenic Area Act. Working with a broad coalition of citizens and businesses in Oregon and Washington, Friends of the Columbia Gorge Project Sites: paved the way for passage of this landmark legislation by Congress in 1986. The Scenic Trail Restoration Projects Area protects and enhances the scenic beauty, Gorge Trail 400 natural and cultural heritage, and recreational Hamilton Mountain Trail opportunities in the Gorge, and supports Latourell Falls Trail economic development in Gorge communities. Viento State Park The Columbia Gorge gives us: Flood & Debris Cleanup Rooster Rock State Park • N<~tive wildflowers and wildlife - including '" 'rlfll~ found nowhere else in the world St. Cloud Park, Wash 'lDn Viento State Park • A rich cultural history with more than 10,000 years of tribal life Illegal Dump/Highway Cleanups • Le~is & Clark, the Oregon Trail, and the Adopt-A-Highway Lir· Pickup- 6/15 Jric Columbia River Highway Gorge Cleanup with ~V- 6/15 HOW TO RESE RVEYOUR SPOT • Unmatched recreational opportunities - FOR GORG EAPPREC IATION WEEK hiking, windsurfing, kayaking, bicycling and Native Plant Restoration more Bridal Veil State Park - ivy removal It's easy: 1.
    [Show full text]
  • Nificant Natural Area Sites and Interconnections
    .~­ ". \ i' .- / ,.• --- ./ \. \ ~ • I. • h j . .LC .' \. \ \ '.', ."'- /_ ,I • ~, I • ,{ \ I j .' ,,'" "..', r -, " (. ) ./ ..~, / / --)" ( , / '- L • r-( ."• \ " • ." L •~ rr ('., r I" ~••. / r ~ ). ," , \ . ) / ) •. ~ \ '-: '.' / -' ", ,'; ---' -, ", - ( '..\~ , " ' '. ,J \. ) .~ .\ / -" ,e.' ·r ","." ~ METROPOLITAN - e> )~ .' \ I" e :\(?-reel1space~, :- J • 'f /' r: /. ..../ .J \ • ~.' / l .. 'v' /". • '> I / I e-, ~ ./ ,I \ • .>" ) Master-Piait ) e• .,/ r ", / Ij .'-..... L e "'" '. \ e ( r e /. e e, , --- '~. e j -.', ,.­ ;' r .. •er, ) r / -'. ~ \' - ( . ~ . ., ~ ~' -\ A Cooperative Regio!lal$ystem ofNa.tural Areas, "Open Space, T~f!:..ils a~¢ Gree.nways / /', ' '.)' " forWilcJlife and p,!ople . ./( . ./ ,... ' .... / r • '. X- •.\ / e ! -, "e- ( \ - '- '\ .J • r~gional go~ernmeht (As' ofJuly 1992) "- (. • Metro is the 'directly elected thatserves , .. ,/ Clackamas, Multnomah and Washington cOUlities andilie 24 Policy Advisory COn:'!m,ittee M,ember;s: • \'citiesThat make up the P~rtlana metropolita~;rea. " "'- Ri~hard Devlin, Metro councilor and chair •e- Metr~is ;~spon~ible f~r soli~:~aste management, op~ration/of Ruth~cFariana, Metro,co~n;ilor rmd vice-chair ,_ .i ,'-- M~tro us~ \, the Washington Park Zoo, transportation-and land Sandi Hansen/Metro councilor " "- ~" ' pl~nping, 1da~inerstad, commissi~ne~ urban growth boundary management, technical ." J Judie Clackamas County . ,. services to local go\\ernments and, 'through the Metropolitan Pauline Anderson, Multnomah County commissioner ) r·, ) : fxposition)Recre,ation Gommission,man~gementofthe
    [Show full text]
  • Tryon Creek @ Hwy 43 Culvert Alternates Analysis
    TRYON CREEK @ HWY 43 CULVERT ALTERNATES ANALYSIS Prepared for: City of Lake Oswego, Oregon June 2007 HENDERSON LAND SERVICES LLC In association with DJ Warren Associates, Inc. This document is printed on recycled paper with soy based ink. ² ACKNOWLEDGEMENTS STUDY FUNDING Metro Regional Parks and Greenspaces Program US Fish and Wildlife Service PARTNERSHIP MEMBERS City of Lake Oswego Douglas Schmitz, City Manager Jane Heisler, Assistant City Manager Kim Gilmer, Parks Director Lisa Hamerlynck, Natural Resource Coordinator, Project Manager Massoud Saberian, Transportation Engineer US Fish and Wildlife Service Jennifer Thompson, Project Coordinator NOAA Fisheries John Johnson, Hydraulic Engineer Oregon Department of Fish and Wildlife Devin Simmons, ODOT Liaison Tom Murtagh, Habitat Biologist Oregon Department of Transportation Ron Kroop, District Manager Gail Curtis, Senior Transportation Planner Melissa Hogan, Environmental Coordinator Tryon Creek State Natural Area Park MG Devereux, Park Manager Tryon Creek Watershed Council Jen Seamans Blatner Friends of Tryon Creek Stephanie Wagner, Executive Director City of Portland Bureau of Environmental Services Amin Wahab, Watershed Manager Cynthia Studebaker, Biologist Metro Ross Roberts, Corridor Planning Manager Jaimie Snook, Rails to Trails Project Manager Portland & Western Railroad Mark Werner, Project Manager This document is printed on recycled paper with soy based ink. ² ACKNOWLEDGEMENTS CONSULTANT TEAM HENDERSON LAND SERVICES LLC Bruce A. Henderson, Project Manager, Partnership Communications
    [Show full text]
  • City of Portland Watershed Health Index ASCE-EWRG & APWA 2012 Sustainable Stormwater Symposium Acknowledgements
    City of Portland Watershed Health Index ASCE-EWRG & APWA 2012 Sustainable Stormwater Symposium Acknowledgements Portland City Council BESPresentation and GSI MarchTeam 8, 2006 It takes a Community to create •Jenniferand Antak, implement Shannonan effective Axtell - BES Watershed •JuliePlan Wilson, GSI Portland Watershed Management Plan Portland City Council WatershedPresentation Approach March 8, 2006 •Cost-effective restoration integratedIt takes a Community •Adaptiveto create strategies and •Addressimplement multiple regulatory requirements.an effective Watershed Plan *Rather than starting with the regulations, Portland focuses on goals and strategies for healthy watersheds. 5 Portland Watersheds Portland Watershed Management Plan Portland Watershed Management Plan Clean Water Act MS4, NPDES and TMDLs CSO Control Stipulated Order Safe Drink Water Act UICs and Groundwater CERCLA (Superfund) Portland Watershed Portland Harbor Management Plan Projects, programs Objectives and and policies Endangered Species Act Salmon and Steelhead Strategies Oregon Statewide Planning Goals 5, 6 and 15 Natural Resource Protection Air, Water and Land Quality Willamette Greenway METRO Growth Management Policies Titles 3 and 13 Portland City Code and Comprehensive Plan NEW? Portland Watershed Management Plan Key Milestones 5-Year Strategy Watershed Plan Milestones •2006: Portland Watershed Management Plan (PWMP) (est. objectives, strategies and actions) •2009: Measures: priority indicators and metrics •2010: Watershed Health Index •2010: Portland Area Watershed Monitoring and Assessment Program (PAWMAP) •2011: First year of PAWMAP data collection •Completion of 5-year Strategy •2012: Watershed Health Index Finalized Watershed Monitoring Objectives Why do we monitor? And how to ensure that monitoring supports watershed restoration efforts. Watershed Health Goals • Hydrology – Move toward normative stream flow conditions to protect and improve watershed and stream health, channel functions, and public health and safety.
    [Show full text]
  • 2017 Lake Oswego TMDL Benchmarks: Summary
    2017 Lake Oswego TMDL Benchmarks: Summary In accordance with the City of Lake Oswego’s (City’s) 2012 National Pollutant Discharge Elimination System (NPDES) municipal separate storm sewer (MS4) permit, Schedule D.3.d, the City must develop total maximum daily load (TMDL) pollutant load reduction benchmarks. Benchmarks must be developed for each TMDL parameter where existing best management practice (BMP) implementation is not estimated to be achieving the wasteload allocation (WLA). The TMDL benchmarks must be submitted to the Oregon Department of Environmental Quality (DEQ) with the City’s NPDES MS4 permit renewal application, due March 1, 2017. The City is a designated management agency (DMA) in both the Willamette Basin and Tualatin Basin TMDLs due to urban stormwater discharges. The City’s MS4 discharges runoff either directly or via tributaries to the Tualatin River and the Lower Willamette River. The applicable TMDL parameters are summarized in Table 1. The City conducted a pollutant load reduction evaluation (PLRE) in 2015. Based on results of the PLRE, the City is estimated to be meeting TMDL WLAs for bacteria and TSS in the Lower Tualatin subbasin and for bacteria in the Fanno Creek subbasin. The City is required to establish TMDL pollutant load reduction benchmarks for the remaining parameters and TMDL waterbodies for the next permit term as shown in Table 1. Table 1. Lake Oswego Applicable WLAs TMDL TMDL TMDL Anticipated to meet WLAs WLA document water body parameter (based on the PLRE 2015) 5,000 counts/100 mL (winter storm event concentration) Bacteria (E. coli) Yes 12,000 counts/100 mL (summer storm event concentration) Lower Tualatin Total phosphorus 0.14 mg/L (summer seasonal concentration) No.
    [Show full text]
  • Tryon Creek Restoration Monitoring and Assessment the Issue
    Tryon Creek Restoration Monitoring and Assessment The Issue Tryon Creek is one of the largest, urban watersheds in Oregon. Much of Tryon Creek lies within the bounds of Tryon Creek State Natural Area, a 645 acre tract of public land in southwest Portland. After leaving the park, it flows through public land owned by the City of Lake Oswego and the City of Portland. This portion of the stream is bisected by a culvert that runs under Oregon Highway (Hwy) 43 and a railroad near the mouth of Tryon Creek. A number of native fish species can currently be found in this stream including steelhead and rainbow trout, coastal cutthroat trout, coho and Chinook salmon. It is thought that Pacific lamprey, western brook lamprey, and other salmon species historically utilized this stream. However, since construction of the culvert under Hwy 43 and the adjacent Credit: CRFPO railroad, passage of lampreys and salmonids has been either Retrofitted culvert with new baffles. inhibited or prevented altogether. The Hwy 43 culvert was constructed in the late 1920s and modified in the 1950s. It is approximately 122 m (401 ft) long with a drop of nearly 6.7 m (22 ft) from top to bottom, resulting in an average grade of 4.6%. Prior to 2009, there were a series of alternating baffles that provided some structure within the culvert, but likely did not provide adequate holding water for fish attempting to migrate upstream. Consequently, this design likely blocked lamprey migration and hindered salmonid movements upstream through the culvert. The Project A collaborative project has been implemented by Oregon Department of Transportation, Oregon Department of Fish and Wildlife, Oregon State Parks, National Marine Fisheries Service, Cities of Portland and Lake Oswego, Friends of Tryon Creek, Tryon Creek Watershed Council, National Fish and Wildlife Foundation, and the U.S.
    [Show full text]