2005 Water Monitor Report

2005 Water Quality Data Analysis

Prepared for

Shell Rock River Watershed District

January 2005

2004-2005 Water Quality Data Analysis

Wenck File #1323-07

Prepared for:

SHELLROCK RIVER WATERSHED DISTRICT PO Box 1147 Albert Lea, MN 56007

Prepared by: July 2006

WENCK ASSOCIATES, INC. 1800 Pioneer Creek Center P.O. Box 249 Wenck Maple Plain, Minnesota 55359-0249 (763) 479-4200 Table of Contents

EXECUTIVE SUMMARY ...... iii

1.0 INTRODUCTION...... 1-1

2.0 HYDROLOGY...... 2-1

2.1 Precipitation ...... 2-1 2.2 Runoff ...... 2-1

3.0 WATER QUALITY...... 3-1

3.1 Streams...... 3-1 3.2 Lakes...... 3-2 3.2.1 Monitoring Results...... 3-2 3.2.2 Lake Modeling Results, Analysis and Potential Goals ...... 3-3

4.0 CONCLUSIONS ...... 4-1

5.0 RECOMMENDATIONS...... 5-1

6.0 REFERENCES...... 6-1

TABLES

2.1 2005 Precipitation Records for Shell Rock River Watershed 2.2 2005 Runoff Over Shell Rock River Watershed 3.1 2005 In-Steam Flow-Weighted Mean Concentrations, Loads, and Watershed Loading 3.2 2005 Average Summer Lake Water Quality

T:\1323\01\Annual MOnitoring\2005\Report\Report_text_05_reformat.doc i

FIGURES

1.1 2005 Monitoring Locations and Major Water Features of Shell Rock River Watershed District 2.1 2005 Monthly Precipitation for the Shell Rock River Watershed 2.2 2005 Cumulative Precipitation for the Shell Rock River Watershed 3.1 2005 Watershed Phosphorus Loads and Loading per Acre 3.2 2005 Watershed Sediment Loads and Loading per Acre 3.3 2005 Mean Summer Total and Ortho Phosphorus for Lakes 3.4 2005 Mean Summer Chlorophyll-a 3.5 2005 Mean Summer Secchi Depth for Lakes 3.6 2005 Soluble to Total Phosphorus Ratio 3.7 Albert Lea Lake Canfield-Bachmann Results 3.8 2005 Nutrient and Sediment Loading to Albert Lea Lake 3.9 Fountain Lake Canfield-Bachmann Results 3.10 2005 Nutrient and Sediment Loading to Fountain Lake 3.11 Pickerel Lake Canfield-Bachmann Results 3.12 2005 Nutrient and Sediment Loading to Pickerel Lake

APPENDICES

A 2005 Water Quality Report Cards B Lake Modeling Results

ACRONYMS

Chl-a Chlorophyll-a lbs pounds mg/L milligrams per liter (parts per million) μg/L micrograms per liter (parts per billion) OP Ortho phosphorus TP Total phosphorus TSS Total suspended solids WCBP Western Corn Belt Plains (Ecoregion)

T:\1323\01\Annual MOnitoring\2005\Report\Report_text_05_reformat.doc ii Executive Summary

Through the Shell Rock River Watershed District annual monitoring program baseline data is collected from the major water features: Albert Lea Lake, Fountain Lake, Pickerel Lake, and their tributaries and the Shell Rock River. Data are collected to assess water quality trends, set goals , and track progress towards goals.

Precipitation in the Shell Rock River Watershed District during 2005 ranged from 2.7 to 5.4 inches above the 30-year average of 33.15 for Albert Lea. The largest precipitation event in 2005, 3.55 inches, was recorded September 26, 2005. The September 29, 2005 storm brought the cumulative precipitation well above normal.

Runoff over the watershed was 5.2 inches over the upper watershed based on outflow from Jugland Dam. By comparison, the runoff in 1973 was reported to be 13.2 inches over the watershed. Precipitation in 1973 was 41.4 inches compared with an average of 36.99 inches in 2005.

In-stream flow-weighted mean TP concentrations ranged from 0.08 to 0.34 mg/L, within the range of values observed in minimally impacted streams in the Western Corn Belt Plains Ecoregion 0.96 to 0.01 mg/L (McCollor & Heiskary, 1993). In-stream total suspended sediment TSS concentrations ranged from 15 to 121 mg/L. In-stream OP concentrations ranged from 0.01 to 0.18 mg/L.

Watershed phosphorus loading in the Shell Rock River Watershed District ranges from .08 lbs/ acre in the I-90 tributary to Albert Lea Lake to 0.4 lbs/ acre in the Goose Lake Tributary to Fountain Lake. This range is on the low end of TP export values observed in the Lower Mississippi River Basin ranges: 0.3 to 0.7 lbs per acre (Mulla et. al, 2002.). Lake water quality observed in 2005 in Albert Lea Lake, Fountain Lake, and Pickerel Lake was generally poor.

T:\1323\01\Annual MOnitoring\2005\Report\Report_text_05_reformat.doc iii Executive Summary (Cont.)

Average summer surface TP concentration in Western Corn Belt Plains Ecoregion Lakes typically range from 121 to 176 μg/L. Comparatively, TP concentrations in District lakes monitored in 2005 are 185 μg/L in Fountain Lake, 308 μg/L in Albert Lea Lake, and 349 μg/L in Pickerel Lake.

The range of Ecoregion summer mean Chlorophyll-a concentrations is 30 to 80 μg/L. Average summer surface Chlorophyll-a concentrations in Albert Lea Lake, Fountain Lake and Pickerel Lake are 126 μg/L, 81 μg/L, and 235 μg/L respectively, higher than Ecoregion summer means.

The average summer Secchi depth in Albert Lea was 2.1 feet, within the published range of summer means (1.6 to 3.3 feet). Average summer Secchi depths in Fountain Lake and Pickerel Lake were 1.3 feet and 0.4 feet respectively, lower than published means.

However, the long term trend is improving water quality in Albert Lea Lake and Fountain Lake over conditions measured since the 1950’s. Analysis of watershed loads indicate that reduction in both internal and external loading is necessary to further improve water quality in District lakes.

T:\1323\01\Annual MOnitoring\2005\Report\Report_text_05_reformat.doc iv

1.0 Introduction

The Shell Rock River Watershed District began an annual water quality-monitoring program soon after their formation in 2003. The program’s focus is on collecting baseline data from the major water features: Albert Lea Lake, Fountain Lake, Pickerel Lake, and their tributaries and the Shell Rock River. Data are collected to: • Assess long-term water quality trends within the District • Select achievable water quality management goals • Track the District’s progress towards management goals

In 2005, the District’s major lakes, Albert Lea Lake, Fountain Lake, and Pickerel Lake were monitored for total phosphorus, water clarity (Secchi Depth) and Chlorophyll-a. The Shell Rock River was monitored for flow, nutrients and sediments at the outlet of Albert Lea Lake and at Glenville. Eight other tributaries to the District’s major lakes were also monitored for the same parameters. Figure 1.1 shows monitoring locations.

Data, findings, and analyses are presented to aid District Staff, Managers and citizens in establishing water quality management goals for the District: • Lake and stream water quality in the Shell Rock River Watershed District is compared to the range of mean values observed in the Western Corn Belt Plains Ecoregion as a means to assess relative water quality and provide a framework to set management goals. • Nutrient loads to lakes are calculated to assess the relative sources of nutrients in the District and identify “hot spots.” • In- lake water quality data is modeled using the Canfield-Bachmann lake equations to assess potential phosphorus loading and response in each of the lakes monitored. These results are compared with in-stream loads to assess un-gauged loads. MnLEAP is also used to model expected in-lake water quality.

T:\1323\01\Annual MOnitoring\2005\Report\Report_text_05_reformat.doc-rlb 1-1

• Recommendations are made to guide future monitoring and analyses.

The report is presented in four sections: Hydrology, Water Quality, Conclusions, and Recommendations. Water quality report cards are presented in Appendix A and lake modeling results are presented in Appendix B.

T:\1323\01\Annual MOnitoring\2005\Report\Report_text_05_reformat.doc-rlb 1-2

2.0 Hydrology

2.1 PRECIPITATION

Precipitation in the Shell Rock River Watershed District during 2005 ranged from 2.7 to 5.4 inches above the 30-year average of 33.15 for Albert Lea. Precipitation was measured at three stations: southwest of Pickerel Lake, the Albert Lea Wastewater Treatment Plant, and at the Airport near Bancroft (Table 2.1 and Figure 2.1).

The largest precipitation event in 2005, 3.55 inches, was recorded September 26, 2005. This precipitation event was reflected in high stream flows measured at some stations September 29, 2005. January through September, precipitation levels had been close to normal. The September 29, 2005 storm brought the cumulative precipitation well above normal (Figure 2.2).

The three precipitation stations in the Shell Rock River Watershed District are all located near the center of the watershed. Given the scale of the Shell Rock River Watershed District, 246 square miles, additional precipitation stations should be established through volunteer precipitation monitoring to better define the distribution of precipitation across the watershed. This will aide in future hydrologic and hydraulic modeling efforts as well as capitol improvement design.

2.2 RUNOFF

Stream flow was measured at 10 locations two to three times per month from May to September in 2005. The runoff for each sub-watershed was calculated based on these discrete flow measurements. This method provides an approximation of watershed runoff and nutrient

T:\1323\01\Annual MOnitoring\2005\Report\Report_text_05_reformat.doc-rlb 2-1 loadings. When the sampling dates are comparable, it allows for comparisons of relative nutrient loadings.

Runoff over the watershed ranges from 2.7 inches at I-90 (a relatively small watershed tributary to Albert Lea Lake), to 5.8 inches at the Shell Rock River in Glenville (the downstream most station in the watershed). As stated in Section 2.1, high flows resulting from the 3.55-inch storm event on September 26, 2005 were measured at some locations, while no data was collected at others following that event. The range in runoff values for each site reflects this data deficiency.

Table 2.2 shows the runoff calculations from this analysis. The note indicates the stations for which runoff volumes are under-predicted based on a lack of sampling data following the September 26, 2005 storm event. Runoff and loadings calculated at these stations are under estimated.

Outflow from Jugland Dam, the outlet of Albert Lea Lake was 5.2 inches over the entire watershed. By comparison, the runoff in 1973 was reported to be 13.2 inches over the watershed. Outflow from Fountain Lake was 3.8 inches over the entire watershed (though, the flow was not measured at Fountain Lake following the 3.55-inch storm September 26, 2005 and therefore the runoff at this site is largely under-predicted). By comparison, the runoff in 1973 was reported to be 9.0 inches over the watershed. Precipitation in 1973 was 41.4 inches compared with an average of 36.99 inches in 2005.

T:\1323\01\Annual MOnitoring\2005\Report\Report_text_05_reformat.doc-rlb 2-2

3.0 Water Quality

3.1 STREAMS

In-stream concentrations of TP, OP, and TSS were measured at ten sites, generally on the same days that flow measurements were collected. These data were used to calculate in-stream loading and flow-weighted mean concentrations. Subwatershed delineations were used to calculate areal watershed loading. Stream report cards are presented as Appendix A.

In-stream TP concentrations range from 0.08 to 0.34 mg/L. The median TP concentration for minimally impacted streams in the Western Corn Belt Plains Ecoregion is 0.20 mg/L (McCollor & Heiskary, 1993). In-stream TSS concentrations range from 15 to 121 mg/L. The median TSS concentration for minimally impacted streams in the Western Corn Belt Plains Ecoregion is 20 mg/L. In-stream OP concentrations range from 0.0.01 to 0.18 mg/L.

Watershed phosphorus loading in the Shell Rock River Watershed District ranges from .08 lbs/ acre in the I-90 tributary to Albert Lea Lake to 0.4 lbs/ acre in the Goose Lake Tributary to Fountain Lake. Based on an analysis of phosphorus indices, TP export in the Lower Mississippi River Basin ranges from 0.3 to 0.7 lbs per acre (Mulla et. al, 2002.).

Table 3.1 shows in-stream concentrations, loads, and watershed loading for total phosphorus, ortho-phosphorus, and total suspended solids. Figures 3.1 and 3.2 compare in-stream nutrient and sediment loads, and loads per acre.

Watershed loading is under predicted in those watersheds noted (Arena Creek, I-90, Fountain Lake Dam and Wedge Creek) due to sampling irregularities.

T:\1323\01\Annual MOnitoring\2005\Report\Report_text_05_reformat.doc-rlb 3-1

3.2 LAKES

Surface concentrations of TP, OP, and Chlorophyll-a were measured at six sites on three lakes, seven times from May to August during 2005. From these data, average summer surface concentrations are calculated. These data are also used to model the expected nutrient loads to the lakes. Modeled loads are compared with the gauged loads observed in District streams. Lake report cards are presented as Appendix A.

3.2.1 Monitoring Results

Lake water quality was measured at three locations in Albert Lea Lake, two locations in Fountain Lake, and one location in Pickerel Lake in 2005. Surface water samples were analyzed for TP, OP, and Chlorophyll-a. Secchi depths were also measured. Table 3.2 and Figures 3.3 - 3.5 compare mean summer surface water quality in District lakes with Ecoregion values.

Average summer surface TP concentration in Western Corn Belt Plains Ecoregion Lakes typically range from 121 to 176 μg/L according to an MPCA study by Heiskary and Wilson. For well mixed (shallow) lakes such as Albert Lea Lake, Pickerel Lake and Fountain Lake, the median concentration in WCBP Ecoregion lakes is 141 μg/L. The MPCA’s recommended standard for shallow lakes in the WCBP Ecoregion is 91 μg/L. Comparatively, TP concentrations in District lakes monitored in 2005 are 185 μg/L in Fountain Lake, 308 μg/L in Albert Lea Lake, and 349 μg/L in Pickerel Lake.

The range of Ecoregion summer mean Chlorophyll-a concentrations is 30 to 80 μg/L. Comparatively, Average summer surface Chlorophyll-a concentrations in Albert Lea Lake, Fountain Lake and Pickerel Lake are 126 μg/L, 81 μg/L, and 235 μg/L respectively, higher than Ecoregion summer means.

T:\1323\01\Annual MOnitoring\2005\Report\Report_text_05_reformat.doc-rlb 3-2

Lake Report Cards in Appendix A show seasonal variation in TP and OP, and year to year variation in TP. Total phosphorus concentrations are generally at or below the Ecoregion guideline in May and early June in Albert Lea and Fountain Lake, but TP concentration clime to maximum values of 350 μg/L and 640 μg/L respectively in late summer.

Concentrations of TP in Pickerel Lake range from 700 μg/L in early July to 200 μg/L in late summer. The lower TP concentration in late summer coupled with a slight increase in Secchi depth and decrease in Chlorophyll-A may indicate an algae die off due to light limitation.

The percent of TP that is readily available for algal use, or OP varies seasonally (Figure 3.6). It is generally lower in early summer, increasing later in the summer. This is potentially an indication of summer internal loading.

In Albert Lea Lake and Fountain Lake, TP concentrations show a decreasing trend (Lake Report Cards, Appendix A). Historical average summer concentrations in Fountain Lake (1940 to 1960) ranged from 200 to 350 μg/L, compared with current concentrations of 185 μg/L. However, the frequency of monitoring was low, and the calculated summer average likely has a large standard deviation. Historic TP concentrations in Albert Lea Lake topped out just under 2,500 μg/L TP in 1950 before declining steadily to their current level of 308 μg/L.

3.2.2 Lake Modeling Results, Analysis and Potential Goals

Lake water quality load-response models can be used in concert with monitoring data to estimate internal and un-gauged loads, and to guide policy makers in setting achievable water quality goals for specific lakes. Two such water quality models were used to evaluate the current

T:\1323\01\Annual MOnitoring\2005\Report\Report_text_05_reformat.doc-rlb 3-3 condition of Albert Lea Lake, Fountain Lake and Pickerel Lake, estimate internal loads, and to estimate the achievable TP reductions.

In shallow, well-mixed lakes, an in-lake TP reduction alone does not necessarily guarantee significantly reduced algal blooms and increased clarity; however, it is a necessary step in achieving a stable shallow lake system. Shallow lake management requires consideration of the lake’s ecological systems such as management of plant and fish communities.

Further, the extent of achievable improvements in water quality may be limited to physical features of the tributary watershed and the lake itself. The lakes are shallow with short residence times and high external loading due to large tributary watersheds and multiple tributaries. Internal loading is also high, likely due to oxygen depletion, and the physical stirring action that occurs in shallow lakes through wind, carp, and boat traffic.

Both lake water quality models used in this evaluation are based on the lake phosphorus predictive model developed by Daniel Canfield and Roger Bachmann (1981). The model has found wide usefulness throughout Minnesota and elsewhere because it is a data-based model, the result of a statistical analysis of data from lakes with a broad range of basin characteristics and water quality. In developing and testing their lake model, Canfield and Bachmann included data from 290 natural lakes, with a range from extremely shallow (0.7-foot mean depth) to extremely deep (1,010 feet), and from extremely short hydraulic detention time (2 days) to extremely long (1,000 years). In addition, the water quality of the lakes varied from oligotrophic (mean total phosphorus concentration 0.004 milligram per liter) to hypereutrophic (2.6 milligrams per liter). Canfield and Bachmann chose all of their lakes from northern Europe, Canada, and the northern United States (including Iowa, where Bachmann was based in 1981), thus Minnesota is squarely within the model’s geographic coverage. The breadth of data encompassed by their statistical analysis implies that the Canfield-Bachmann model is applicable, at least for a “first-cut” model, to virtually any Minnesota lake.

T:\1323\01\Annual MOnitoring\2005\Report\Report_text_05_reformat.doc-rlb 3-4

Developers of the MN LEAP model site that the model does not accurately predict water quality in polymictic WCPB lakes, lakes with high internal phosphorus cycling, turbid lakes, and chains of lakes with upstream sedimentation. The lakes in the Shell Rock River Watershed District each meet several if not all of these criteria. This is partly due to a small amount of data available for lakes in the area.

Canfield-Bachmann analysis was used to assess the likely phosphorus loads to each of the three lakes monitored in 2005 based on in-lake concentrations. The Canfield-Bachmann model uses lake morphometry, tributary watershed size, in-lake TP concentrations, and water balance to back-calculate the nutrient loading. The modeled TP loads were compared to measured TP loads from watershed streams. The results of this analysis are presented below for Albert Lea Lake, Fountain Lake and Pickerel Lake. The model results are included as Appendix C. The results are discussed below.

Albert Lea Lake: Figure 3.7 shows the response of mean summer in lake TP concentration to variations in annual TP loading based on a Canfield Bachmann model. The model predicts 90,000 lbs of phosphorus loading to the lake annually (based on 5.2 inches of runoff over the watershed) is required to yield the observed in-lake average summer surface TP concentrations of 308 μg/L.

Stream sampling of the Fountain Lake, I-90, and Peter Lund Creek tributary watersheds show a load of 11,000 lbs in 2005. The remaining un-quantified loads to Albert Lea Lake include the un-gauged area directly tributary to Albert Lea Lake (about 5,500 acres, or 6% of the watershed), atmospheric and internal loading. Assuming a flow-weighted average inflow from the un- gauged area of 300 μg/L, the TP load from this area is estimated to be 1,900 lbs annually. The remaining load is about 74,000 lbs or 79% of the load to Albert Lea Lake. This is used as a rough estimate of Albert Lea Lake’s internal loading. Figure 3.8 shows a schematic of the loading.

T:\1323\01\Annual MOnitoring\2005\Report\Report_text_05_reformat.doc-rlb 3-5

The MN LEAP model predicts in-lake TP concentrations to be 230 μg/L. Observed in-lake TP concentrations vary between 37 μg/L in early summer to 640 μg/L in late summer. The observed average summer surface concentration is 308 μg/L.

MN LEAP predicts Secchi depths of 1.3 feet. Observed Secchi depths in Albert Lea Lake range from 5.5 feet in mid June to 0.3 feet in late summer with an average summer Secchi depth of 2.1 feet. The MN LEAP model predicts Chlorophyll-a concentrations of 186 μg/L. Observed concentrations range from 1 μg/L to 365 μg/L, summer average concentration is 126 μg/L.

In terms of water clarity and Chlorophyll-a concentrations, water quality in Albert Lea Lake is better than the MN LEAP prediction, even though predicted TP concentrations are lower than observed.

Historically, the average summer surface TP concentrations in Albert Lea Lake have ranged from 2,400 μg/L in 1951 (1 data point) to 135 μg/L in 2004.

Based on the Canfield Bachmann results, an additional TP load reduction of about 80% or74,000 lbs is necessary to achieve the proposed guideline for shallow lakes in the Western Cornbelt Plains established by the MPCA of 91 μg/L. This indicates that a significant reduction in both external and internal loading is required to reduce in-lake TP concentrations.

Fountain Lake: Figure 3.9 shows the response of mean summer in lake TP concentration to variations in annual TP loading based on a Canfield Bachmann model. The model predicts that 22,400 lbs of annual phosphorus loading (based on 5.2 inches of runoff over the watershed) is required to yield the observed in-lake TP concentrations.

Stream sampling from the tributary watersheds of Arena Creek, Wedge Creek, Bancroft Creek, and Goose Creek shows a load of 9,400 lbs in 2005. The remaining loads to Fountain Lake

T:\1323\01\Annual MOnitoring\2005\Report\Report_text_05_reformat.doc-rlb 3-6

include the un-gauged area directly tributary to Fountain Lake (about 7,000 acres or 11 % of the watershed), atmospheric loading and internal loading. Assuming a flow-weighted mean TP concentration from the un-gauged direct watershed of 300 μg/L the TP load from this area is estimated to be 2,600 lbs annually. The remaining load is about 10,400 lbs or 46% of the load to Fountain Lake. This is used as a rough estimate of Fountain Lake’s internal loading. Figure 3.10 shows a schematic of the loading.

The MN LEAP model predicts in-lake TP concentrations to be 301 μg/L. Observed in-lake TP concentrations vary between 50 μg/L in early summer and 350 μg/L in late summer. The summer average is 185 μg/L.

The MN LEAP model predicts Secchi depths of 1 ft. Observed Secchi depths in Fountain Lake range from 0.5 ft in mid May to 1.8 feet in August, with an average of 1.3 feet. The MN LEAP model predicts Chlorophyll-A concentrations of 275 μg/L. Chlorophyll-A concentrations range from 26 to 172 μg/L, with an average concentration of 81 μg/L.

Observed average summer surface water quality in Fountain Lake is better than the MN LEAP predictions. TP and Chlorophyll-A concentrations are below MN LEAP predictions. Seasonal water quality variations in Fountain Lake bring TP concentrations well above the MN LEAP prediction.

Total phosphorus concentrations in Fountain Lake have ranged from 480 μg/L in the west basin of the lake during August 1962 to 50 μg/L in mid June 2005. Summer averages range from 335 μg/L in 1962 to 185 μg/L in 2005 (Appendix A, Figure A2). Overall, TP concentrations in Fountain Lake show a decreasing trend.

Based on the Canfield Bachmann results, an additional TP load reduction of about 60% or 12,800 lbs is necessary to achieve the proposed guideline for shallow lakes in the Western Cornbelt Plains established by the MPCA of 91 μg/L. This indicates that a significant reduction in both external and internal loading is required to reduce in-lake TP concentrations.

T:\1323\01\Annual MOnitoring\2005\Report\Report_text_05_reformat.doc-rlb 3-7

Pickerel Lake: Figure 3.11 shows the response of mean summer in lake TP concentration to variations in annual TP loading based on a Canfield Bachmann model. The model predicts that 13,360 lbs of annual phosphorus loading (based on 5.2 inches of runoff over the watershed) is required to yield the observed in-lake TP concentrations.

The 8.6 square mile tributary watershed to Pickerel Lake is un-gauged. Assuming a flow- weighted mean TP concentration from the un-gauged direct watershed of 1,000 μg/L the TP load from this area is estimated at 6,460 lbs annually. The remaining load is about 6,500 lbs or 49% of the load to Pickerel Lake. This is used as a rough estimate of Pickerel Lake’s internal loading, however since the Pickerel tributary sub-watershed remains un-gauged, and since the hydrology and delineation are not certain, this number is subject to a high degree of error. Figure 3.12 shows a schematic of the loading. The presence of a large sod farm on the tributary watershed increases the likelihood that watershed concentrations are high.

The MN LEAP model predicts in-lake TP concentrations to be 176 μg/L. Observed in-lake TP concentrations are 349 μg/L. The MN LEAP model predicts Secchi depths of 1.3 ft. Observed average summer Secchi depths in Pickerel Lake are 0.4 feet. The MN LEAP model predicts Chlorophyll-A concentrations of 126 μg/L. The observed average summer Chlorophyll-A concentration is 240 μg/L.

Observed average summer surface water quality in Pickerel Lake is poorer than the MN LEAP predictions.

No long-term data is available for Pickerel Lake to assess historical trends. Therefore more analysis is needed to determine the trend and verify nutrient loading sources.

Based on the Canfield Bachmann results, an additional TP load reduction of about 86% or 12,500 lbs is necessary to achieve the proposed guideline for shallow lakes in the Western

T:\1323\01\Annual MOnitoring\2005\Report\Report_text_05_reformat.doc-rlb 3-8

Cornbelt Plains established by the MPCA of 91 μg/. This indicates that a significant reduction in both external and internal loading is required to reduce in-lake TP concentrations.

T:\1323\01\Annual MOnitoring\2005\Report\Report_text_05_reformat.doc-rlb 3-9

4.0 Conclusions

1. Annual precipitation for 2005 was above normal. A 3.55-inch precipitation event (roughly the 5 year precipitation event) occurred on September 26, 2005.

2. Runoff over the watershed at Albert Lea Lake Outlet and at Glenville was 5.2 and 5.8 inches respectively.

3. Phosphorus loading in the District ranged from 0.1 to 0.4 lbs/ acre. Total suspended solids loading ranged from 18 to 107 lbs/ acre in Goose Lake and Arena Creek respectively. These values are within published ranges for rural watersheds.

4. Summer mean total phosphorus concentrations for Albert Lea Lake, Fountain Lake, and Pickerel Lake are higher than those generally observed for lakes within the Western Corn Belt Plains Ecoregion.

5. In general, Secchi depth and chlorophyll-a values are within the range of those observed in other lakes in the Western Corn Belt Plains Ecoregion. In lake turbidity could be limiting algal growth.

T:\1323\01\Annual MOnitoring\2005\Report\Report_text_05_reformat.doc 4-1

5.0 Recommendations

1. Recruit Citizen Precipitation Recorders to expand precipitation data coverage for the District.

2. Sample all stream sites on the same dates. The efficacy of weekly stream sampling depends in part on having a uniform set of sampling dates for each site. Having this enables an “apples-to-apples” comparison of runoff volumes and nutrient and sediment loads to comparatively assess which areas of the watershed are contributing the most loads to primary water bodies.

3. Recruit citizens to measure and record lake elevations daily and Secchi depths several times per month.

4. Consider adding volatile suspended solids to lake outlet monitoring in 2007 to investigate whether the TSS is organic (algae) or inorganic (sediment from rough fish). .

5. Setting lake management goals through individual lake management plans will guide future monitoring and additional analysis.

6. Define hydrology, and subwatersheds for Pickerel Lake and sample the effluent from the sod farm. Develop a target sampling plan to determine the nutrient budget.

T:\1323\01\Annual MOnitoring\2005\Report\Report_text_05_reformat.doc 5-1

6.0 References

Canfield, D.E., Jr., and Bachmann, R.W. 1981. “Prediction of Total Phosphorus Concentrations, Chlorophyll-a, and Secchi Depths in Natural and Artificial Lakes”. Can. J. Fish. Aquatic Sci. 38:414-423.

McCollor and Heiskary. 1993. “Selected Water Quality Characteristics of Minimally Impacted Streams from Minnesota’s Seven Ecoregions.” Minnesota Pollution Control Agency Water Quality Division.

Mulla et. al. 2002 “Estimating Phosphorus Losses from Agricultural Lands for MPCA’s Detailed Assessment of Phosphorus Sources to Minnesota Watersheds” University of Minnesota.

Heiskary, S. “Simplified lake Eutrophication Modeling: using the Ecoregion Based Model of MIN LEAP” http://www.pca.state.mn.us/water/pubs/mnleap-overview.pdf

T:\1323\01\Annual MOnitoring\2005\Report\Report_text_05_reformat.doc 6-1

Tables

Table 2.1

Shell Rock River Watershed District 2005 Water Quality Data Analysis

2005 Precipitation Records for Shell Rock River Watershed

2005 Monthly Precipitation (inches) 1971-2000 Month Normal Pickerel Lake Bancroft Albert Lea January 0.87 1.20 0.81 0.50 February 0.67 1.15 0.81 1.16 March 2.02 1.89 1.06 1.64 April 3.39 3.26 3.69 3.56 May 4.18 5.53 4.45 4.91 June 4.79 3.36 3.81 4.10 July 4.15 6.30 5.39 4.63 August 4.51 4.12 4.53 4.46 September 3.05 6.75 6.73 6.69 October 2.52 1.24 1.82 1.55 November 2.00 2.33 2.15 2.29 December 1.00 1.40 0.61 1.09 Total: 33.15 38.53 35.86 36.58

T:\1323\01\Annual MOnitoring\2005\Precipitation Wenck Associates, Inc. Table 2.2

Shell Rock River Watershed District 2005 Water Quality Data Anlysis

2005 Runoff Over Shell Rock River Watershed

Tributary Sub- watershed Area Runoff Location (acres) Note (inches) Arena Creek Rd Co Rd 46 7,887 1 3.9 Bancroft Stream 22,002 5.4 DS-Fountain Lake Dam 62,061 1 3.8 Goose Lake 3,607 5.1 I-90 2,108 1 2.7 Mudd Creek 4,320 4.9 Peter Lund Stream 18,448 4.1 Shell Rock Outlet 90,560 5.2 Shell Rock Glenville 95,519 5.8 Wedge Creek 21,065 1 3.7 Notes: 1. Runoff and loading do not reflect the 3.55-inch storm on September 25, 2005 and therefore underpredict runoff and loading.

T:\1323\01\Annual MOnitoring\2005\Data Analysis\Stream Loading Wenck Associates, Inc. Tabel 3.1

Shell Rock River Watershed District 2005 Water Quality Data Analysis

2005 In-stream Flow Weighted Mean Concentrations, Loads, and Watershed Loading

Total Phosphorus Ortho Phosphorus TSS

Tributary Sub- Runoff over watershed Area watershed (2) (2) (2) Location (acres) Note (inches) mg/L lbs lbs/acre mg/L lbs lbs/acre mg/L lbs lbs/acre Arena Creek Rd Co Rd 46 7,887 1 3.9 0.30 2,108 0.27 0.04 251 0.03 121 847,962 108 Bancroft Stream 22,002 5.4 0.10 2,772 0.13 0.06 1,645 0.07 48 1,289,916 59 DS-Fountain Lake Dam 62,061 1 3.8 0.17 9,016 0.15 0.03 1,631 0.03 34 1,840,792 30 Goose Lake 3,607 5.1 0.34 1,426 0.40 0.18 741 0.21 15 63,861 18 I-90 2,108 1 2.7 0.13 171 0.08 0.12 154 0.07 41 51,580 24 Mudd Creek 4,320 4.9 0.08 392 0.09 0.05 233 0.05 21 101,269 23 Peter Lund Stream 18,448 4.1 0.11 1,819 0.10 0.08 1,402 0.08 20 346,303 19 Shell Rock Outlet 90,560 5.2 0.17 18,183 0.20 0.01 1,373 0.02 31 3,322,328 37 Shell Rock Glenville 95,519 5.8 0.23 28,266 0.30 0.13 16,753 0.18 27 3,381,543 35 Wedge Stream 21,065 1 3.7 0.17 3,051 0.14 0.06 1,150 0.05 60 1,069,805 51 Notes: 1. Runoff and loading do not reflect the 3.55-inch storm on September 25, 2005 and therefore under-predict runoff and loading. 2. Concentration is a flow-weighted mean

T:\1323\01\Annual MOnitoring\2005\Data Analysis\Stream Loading Wenck Associates, Inc. Table 3.2

Shell Rock River Watershed District 2005 Water Quality Data Analysis

2005 Average Summer Lake Water Quality

Summer Averages (June-Sept) Site TP (μg/L) OP (μg/L) Chlor-A (μg/L) Secchi (ft) Nitrate (mg/L) Expected concentrations for well 30 - 80 (range of 1.6 -3.3 (range of mixed WCBP Lakes 141 (median) -- summer means) summer means) -- Albert Lea Lake-Site 1 332 177 78 1.9 0.6 Albert Lea Lake-Site 2 239 60 117 2.8 1.1 Albert Lea Lake-Site 3 354 133 182 1.5 3.3 Albert Lea Lake Average 308 123 126 2.1 1.6 Fountain Lake-Site 1 147 46 57 1.4 6.2 Fountain Lake-Site 2 223 48 106 1.2 4.3 Fountain Lake Average 185 47 81 1.3 5.3 Pickerel Lake 349 68 235 0.4 0.3

T:\1323\01\Annual MOnitoring\2005\Lake Sampling 2005_Compiled Wenck Associates, Inc.

Figures

!( ¨¦§90 !( !( !( ^_ ^_ !( !( !( !( ^_ ^_ ^_ ¤£65 ^_ !(

35 ¨¦§ !( ¤£69

Legend ^_ Lake Sampling Locations !( Stream Sampling Stations Subwatersheds Roads Project Area

2 1 0 2 Miles ³ L:/1323/04/mxd file/Monitoring Locations.mxd T H G I R

SHELL ROCK RIVER WATERSHED DISTRICT Y JUNE 2006 P O C 2005 Monitoring Locations and Major Water Features Wenck Associates, Inc. 1800 Pioneer Creek Center Figure 1.1 of Shell Rock River Watershed District Environmental Engineers Maple Plain, MN 55359-0429 Figure 2.1

2005 Monthly Precipitation for the Shell Rock River Watershed District

Shell Rock River Watershed District 2005 Water Quality Data Analysis 8

1971-2000 Normal Pickerel Lake Bancroft Albert Lea

Precipitation (inches) 3

0 January February March April May June July August September October November December T:\1323\01\Annual MOnitoring\2005\[Precipitation.xls]Figure 2.1

Wenck Associates, Inc. Figure 2.2

2005 Cumulative Precipitation for the Shell Rock River Watershed District

Shell Rock River Watershed District 2005 Water Quality Data Analysis 45

1971-2000 Normal Pickerel Lake 40 Bancroft Albert Lea

20 Precipitation (inches)

0 January February March April May June July August September October November December T:\1323\01\Annual MOnitoring\2005\[Precipitation.xls]Figure 22

Wenck Associates, Inc. Figure 3.1 2005 Watershed Phosphorus Loads and Loading per Acre

Shell Rock River Watershed District 2005 Water Quality Data Analysis 0.60 30,000 TP Load (lbs) OP Load (lbs) 0.50 25,000 TP (lbs/acre)

0.40 20,000

0.30 15,000

0.20 10,000 Phosphorus Load (lbs) Phosphorus Load (lbs/acre)

0.10 5,000

0.00 0 Arena Bancroft DS- Goose I-90 Mudd Peter LundShell RockShell Rock Wedge Creek Rd Stream Fountain Lake Creek Stream Outlet Glenville Creek Co Rd 46 Lake Dam

T:\1323\01\Annual MOnitoring\2005\Data Analysis\[Stream Loading.xls]Subwatershed Areas Figure 3.2

2005 Watershed Sediment Loads and Loading per Acre

Shell Rock River Watershed District 2005 Water Quality Data Analysis 200 4,000 TSS Load (lbs) 175 TSS (lbs/acre) 3,500

150 3,000

125 2,500

100 2,000

TSS (lbs/acre) 75 1,500

50 1,000 Thousands of Pounds

25 500

0 0 Arena Bancroft DS- Goose I-90 Mudd Peter LundShell RockShell Rock Wedge Creek Rd Stream Fountain Lake Creek Stream Outlet Glenville Creek Co Rd 46 Lake Dam T:\1323\01\Annual MOnitoring\2005\Data Analysis\[Stream Loading.xls]Subwatershed Areas Figure 3.3

2005 Mean Summer Total and Ortho Phosphorus for Lakes

Shell Rock River Watershed District 2005 Water Quality Data Analysis

0.40

Total Phosphorus 0.35 Ortho Phosphorus Ecoregion MedianTP for Well Mixed Lakes (0.132 ug/L)

0.30

0.25 g/L) μ

0.20

Concentration( 0.15

0.10

0.05

0.00 Albert Lea Lake Fountain Lake Pickerel Lake T:\1323\01\Annual MOnitoring\2005\[Lake Sampling 2005_Compiled.xls]Summer Averages Wenck Associates, Inc. Figure 3.4

2005 Mean Summer Chlorophyll-a for Lakes

Shell Rock River Watershed District 2005 Water Quality Data Analysis

0.25

Chlorophyll-a Typical Range of Summer Mean values, 30 to 80 ug/L

0.20

0.15 g/L) μ

0.10 Concentration (

0.05

0.00 Albert Lea Lake Fountain Lake Pickerel Lake

T:\1323\01\Annual MOnitoring\2005\[Lake Sampling 2005_Compiled.xls]Summer Averages Wenck Associates, Inc. Figure 3.5

2005 Mean Summer Secchi Depth for Lakes

Shell Rock River Watershed District 2005 Water Quality Data Analysis

Albert Lea Lake Fountain Lake Pickerel Lake 0.00

0.50

1.00

1.50

2.00 Secchi Depth(feet)

2.50

3.00

3.50

Secchi Depth Typical Range of Summer Mean Values, 1.6 -3.3 ft T:\1323\01\Annual MOnitoring\2005\[Lake Sampling 2005_Compiled.xls]Summer Averages Wenck Associates, Inc. Figure 3.6

2005 Ortho to Total Phosphorus Ratio

Shell Rock River Watershed District 2005 Water Quality Data Analysis

Albert Lea Lake Site 1 80% Site 2 Site 3 60%

40%

20% OP/TP Ratio % Ratio OP/TP

0% 5/8/2005 5/28/2005 6/17/2005 7/7/2005 7/27/2005 8/16/2005 9/5/2005

Fountain Lake 80%

60% Site 2 Site 1 40%

20% OP/TP Ratio % Ratio OP/TP

0% 5/8/2005 5/28/2005 6/17/2005 7/7/2005 7/27/2005 8/16/2005 9/5/2005

Pickerel Lake 80%

60%

40%

OP/TP Ratio % Ratio OP/TP 20%

0% 5/8/2005 5/28/2005 6/17/2005 7/7/2005 7/27/2005 8/16/2005 9/5/2005

T:\1323\01\Annual MOnitoring\2005\[Lake Sampling 2005_Compiled.xls]Fig 3.6

Wenck Associates, Inc. Figure 3.7

Albert Lea Lake Canfield-Bachmann Results

Shell Rock River Watershed District 2005 Water Quality Data Analysis

120,000

100,000

Reduce TP Loading to Meet Selected In- 80,000 2005 In Lake lake TP Goal Concentration Concentration 309 ug/L 91,000 lbs Total 60,000 (based on model) TP Load (lbs/ yr) TP Load (lbs/ 40,000

In Lake TP vs Annual TP Loading 20,000 Ecoregion Guideline 2005 Summer Mean TP Concentration

0 0 50 100 150 200 250 300 350 Average Summer TP Concentration (ug/L)

T:\1323\01\Annual MOnitoring\2005\Data Analysis\CB_Analysis.xls\Fig 3.6 Wenck Associates, Inc. Figure 3.8 2005 Nutrient and Sediment Loading to Albert Lea Lake

Shell Rock River Watershed District 2005 Water Quality Data Analysis A. TP Loading Breakdown I- 90 Peter Lund 0% Stream C. Watershed Areas, Areal Loading 2% Fountain Rate, and TP Loads Lake & Direct/ Tributaries Ungaged 10% 7%

Atmospheric 2% Internal Load

Inter nal 79% I-90 2,108 acres Fountain Lake Dam 0.1 lbs/ac 62,100 acres 171 lbs 0.1 lbs/ac 9,016 lbs Peter Lund B. TSS Loading Breakdown Albert Lea Lake 18,448 acres 308 mg/L 0.1 lbs/ac Direct/ Ungaged 1,819 lbs 15%

Peter Lund Jugland Dam Stream Direct Watershed Runoff 13% (un gauged) 90,560 acres Fountain 0.2 lbs/ac Lake & Tributaries 18,183 lbs 70%

I-90 2% Wenck Associates, Inc. T:\1323\01\Annual MOnitoring\2005\Data Analysis/Fountain.ppt Figure 3.9

Fountain Lake Canfield-Bachmann Results

Shell Rock River Watershed District 2005 Water Quality Data Analysis

25,000 Reduce TP Loading to Meet Selected In- 2005 In Lake lake TP Goal Concentration 20,000 Concentration 185 ug/L 22,400 lbs Total (based on model) 15,000 median

In Lake TP vs Annual TP Loading 2005 Summer Mean TP Concentration 10,000 TP Load (lbs/ yr) TP Load (lbs/ 90 = proposed guideline Ecoregion Guideline

5,000

0 0 50 100 150 200 250 Average Summer TP Concentration (ug/L)

T:\1323\01\Annual MOnitoring\2005\Data Analysis\CB_Analysis.xls\Fig 3.6 Wenck Associates, Inc. Figure 3.10 2005 Nutrient and Sediment Loading to Fountain Lake

Shell Rock River Watershed District 2005 Water Quality Data Analysis A. TP Loading Breakdown

Arena Creek 9% C. Watershed Areas, Areal Loading Bancroft Rate, and TP Loads Creek 12% Internal Bancroft Creek 46% Goose Creek 6% 22,000 acres Ungagued Wedge Creek 0.1 lbs/ac Direct (est. Wedge Creek Goose Lake based on 300 14% 21,100 acres 2,772 lbs μg/L, 7,000 3,610 acres 0.1 lbs/ac acres 0.4 lbs/ac ungauged) Atmospheric 3,051 lbs 12% 1,426 lbs 1% Arena Creek 7.900 acres Fountain Lake Internal Load B. TSS Loading Breakdown 0.3 lbs/ac 185 mg/L Est 10,300 lbs 2,108 lbs

Wedge Creek Arena Creek Fountain Lake Dam 26% 33% Direct Watershed Runoff 62,100 acres (un gauged) 0.1 lbs/ac 7,000 acres 9,016 lbs Est 2,600 lbs

Goose Creek Bancroft 2% Creek 39% Wenck Associates, Inc. T:\1323\01\Annual MOnitoring\2005\Data Analysis/Fountain.ppt Figure 3.11

Pickerel Lake Cannfield-Bachmann Results

Shell Rock River Watershed District 2005 Water Quality Data Analysis

30,000

25,000

Reduce TP Loading to Meet Selected In- 20,000 lake TP Goal Concentration

15,000 2005 In Lake Concentration 349 ug/L TP Load (lbs/ yr) 10,000 13,360 lbs Total (based on model)

5,000 In Lake TP vs Annual TP Loading Ecoregion Guideline 2005 Summer Mean TP Concentration 0 0 100 200 300 400 500 600 Average Summer TP Concentration (ug/L)

T:\1323\01\Annual MOnitoring\2005\Data Analysis\CB_Analysis.xls\Fig 3.11 Wenck Associates, Inc. Figure 3.12 2005 Nutrient Loading to Pickerel Lake

Shell Rock River Watershed District 2005 Water Quality Data Analysis A. TP Loading Breakdown

C. Watershed Areas, Areal Loading Rate, and TP Loads

Direct and Un- gauged Pickerel Lake Ungaged Watershed 348 mg/L Internal Load Internal 48% 49% 5,477 acres ~6,500 lbs 1.2 lbs/ac 6,456 lbs

Arena Creek 7,887 acres 0.3 lbs/ac Atmospheric 3% 2,108 lbs

Wenck Associates, Inc. T:\1323\01\Annual MOnitoring\2005\Data Analysis/Fountain.ppt Appendix A

2005 Water Quality Report Cards Albert Lea Lake: Eutrophic/ Hypereutrophic Phosphorus Loads to Albert Lea Lake Fountain Lake Dam I-90 62,100 acres 0.1 lbs/ac 2,108 acres 9,016 lbs 0.1 lbs/ac Direct Watershed 171 lbs Runoff (7,943 ac), Internal Load/ Atmospheric Load ~80,000 Peter Lund 18,448 acres 0.1 lbs/ac 1,819 lbs Tributary Sub watershed (shaded) Lake Data Surface Area: Jugland Dam 2,453 acres 90,560 acres Maximum Depth: 6.0 feet 0.2 lbs/ac Subwatershed Area: 90,560 acres 18,183 lbs Mean Depth: 3.5 feet 2005 Discharge Volume: 5.2 inches

Albert Lea Lake Historical Mean Summer Secchi Depth 1972 1977 1978 1991 1993 1995 1997 2000 2004 0.0 0.5 1.0 1.5 2.0 2.5

Secchi Depth (ft) 3.0 3.5 Annual Summer Mean Secchi Depth Mn LEAP Predicted Secchi= 1.3 ft WCP Ecoregion Observed Range of Summer Means 1.6 to 3.3 ft

Albert Lea Lake Historical Mean Summer TP Concentrations ) 3,000 Summer Mean TP Concentrations Mn LEAP Prediction 2,500 Median TP for Polymictic Lakes in the WCP Ecoregion MPCA Proposed Guideline for Shallow Lakes in WCP 2,000 Power (Summer Mean TP Concentrations) 1,500 1,000 500 Total Phosphorus (ug/L Phosphorus Total 0 1940 1950 1960 1970 1980 1990 2000 2010

Shell Rock River Watershed District Wenck May 2006 Albert Lea Lake Wenck Associates, Inc. 1800 Pioneer Creek Center Figure A1 Environmental Engineers Maple Plain, MN 55359 Albert Lea Lake MPCA Proposed Shallow Lake Ecoregion 2005 Water Quality Summary Graphs guidelines for in the Western Corn Belt Plains Total Phosphorus (TP): < 90 ug/L Chlorophyll-a: < 30 ug/L Secchi Depth: > 0.7 meter

Albert Lea Lake Phosphorus 700 600 500 400

(ug/L) 300 200 100

Phosphorus Concentration Concentration Phosphorus 0 05/01/05 05/31/05 07/01/05 07/31/05 08/31/05 09/30/05 Site 1-TP Site 2-TPDate Site 3-TP Site 1-OP Site 2-OP Site 3-OP Ecoregion Guideline

Albert Lea Lake Chlorophyll-a

400 Site 1-Chlor-a ) 350 Site 2-Chlor-a Site 3-Chlor-a 300 Ecoregion Guideline 250 200 150 100 50 Chlor-a Concentration (ug/ L (ug/ Concentration Chlor-a 0 05/01/05 05/31/05 07/01/05Date 07/31/05 08/31/05 09/30/05

Albert Lea Lake Secchi Depth

Date 05/01/05 05/31/05 07/01/05 07/31/05 08/31/05 09/30/05 0

0.5

1 Site 1-Secchi Site 2-Secchi 1.5 Site 3-Secchi Secchi Depth (ft) Depth Secchi Ecoregion Guideline 2

Shell Rock River Watershed District Wenck May 2006 Albert Lea Lake Wenck Associates, Inc. 1800 Pioneer Creek Center Figure 1A Environmental Engineers Maple Plain, MN 55359 Fountain Lake: Eutrophic to Hypereutrophic Phosphorus Loads to Fountain Lake Bancroft Creek Wedge Creek Goose Lake 22,000 acres 21,100 acres 3,610 acres 0.1 lbs/ac 0.1 lbs/ac 0.4 lbs/ac 2,772 lbs 3,051 lbs 1,426 lbs

Direct Watershed Runoff (un gauged) (7,000 acres) Tributary Sub watershed Internal Load (shaded) ~13,000 lbs

Fountain Lake Dam Arena Creek Lake Data 62,100 acres 7.900 acres 0.1 lbs/ac Surface Area: 555 Acres 0.3 lbs/ac 9,016 lbs Maximum Depth: 9.5 Feet 2,108 lbs Subwatershed Area: 62,700 acres Mean Depth: 6.0 Feet Discharge Volume: 3.8 inches

Fountain Lake Historical Mean Summer Secchi Depth 1973 1977 1985 1986 1987 1989 1991 1992 2004 2005 0 0.5 1 1.5 2 2.5 Secchi Depth (ft) Depth Secchi Average of All Bays 3 Mn LEAP Prediction 3.5 WCP Ecoregion Observed Range of Summer Means 1.6 to 3.3 ft

Fountain Lake Historical Mean Summer TP Concentrations

600 Summer Mean TP Concentration Ecoregion Median TP for Polymictic Lakes in WCP, 140 ug/L 500 g/L) Mn LEAP Prediction 301 ug/L 400 Power (Summer Mean TP Concentration)

300

200

100 Total Phosphorus ( Phosphorus Total 0 1940 1950 1960 1970 1980 1990 2000 2010 Shell Rock River Watershed District Wenck May 2006 Fountain Lake Wenck Associates, Inc. 1800 Pioneer Creek Center Figure A2 Environmental Engineers Maple Plain, MN 55359 Fountain Lake MPCA Proposed Shallow Lake Ecoregion 2005 Water Quality Summary Graphs guidelines for in the Western Corn Belt Plains Total Phosphorus (TP): < 90 ug/L Chlorophyll-a: < 30 ug/L Secchi Depth: > 0.7 meter

Fountain Lake Total Phosphorus 400 Sit e 1 -T P 350 Sit e 2 -T P 300 Sit e 1 -O P Sit e 2 -O P 250 Ecoregion Guideline 200 150 100

TP Concentration (ug/L Concentration TP 50 0 5/1/05 5/31/05 7/1/05 7/31/05 8/31/05 9/30/05 Date

Fountain Lake Chlorophyll-a 200 Site 1-Chlor-a

) 180 160 Site 2-Chlor-a 140 Ecoregion Guidelines 120 100 80 60 40 Chlor-a ConcentrationChlor-a (ug/L 20 0 5/1/05 5/31/05 7/1/05 7/31/05 8/31/05 9/30/05 Date

Fountain Lake Secchi Depth Date 5/1/05 5/31/05 7/1/05 7/31/05 8/31/05 9/30/05 0

0.5

1.5

2 Secchi Depth(m) Secchi Site 1-Secchi Depth 2.5 Site 2-Secchi Depth Ecoregion Guideline 3

Shell Rock River Watershed District Wenck May 2006 2005 Hydrologic Data Report Wenck Associates, Inc. 1800 Pioneer Creek Center Fountain Lake Environmental Engineers Maple Plain, MN 55359 Pickerel Lake:Hypereutrophic Phosphorus Loads to Pickerel Lake

Arena Creek 7,887 acres 0.3 lbs/ac 2,108 lbs

Tributary Sub watershed Mud Creek (shaded) 4,320 acres Lake Data 0.1 lbs/ac Direct Watershed 392 lbs Runoff (un Surface Area: 715 acres gauged=3,566 Maximum Depth: 5.5 feet acres): / Internal Subwatershed Area: 7887 acres Load ~14,200 lbs Mean Depth: 3.8 feet Outflow Volume: 4.9 inches

Fountain Lake Historical Mean Summer Secchi Depth 2004 2005 0.00 0.50 (ft) 1.00 1.50 2.00 2.50 Average of All Bays Secchi Depth Depth Secchi 3.00 Mn LEAP Prediction 3.50 WCP Ecoregion Observed Range of Summer Means 1.6 to 3.3 ft

Albert Lea Lake Historical Mean Summer TP Concentrations 400 350 ) 300 250 200 150 100 50 Summer Mean TP Concentrations Mn LEAP Prediction 0 Median TP for Polymictic Lakes in the WCP Ecoregion 2004 MPCA Proposed Guideline for Shallow Lakes in WCP 2005 Total Phosphorus (ug/L Phosphorus Total

Shell Rock River Watershed District Wenck May 2006 Pickerel Lake Wenck Associates, Inc. 1800 Pioneer Creek Center Figure A3 Environmental Engineers Maple Plain, MN 55359 Pickerel Lake MPCA Proposed Shallow Lake Ecoregion 2005 Water Quality Summary Graphs guidelines for in the Western Corn Belt Plains Total Phosphorus (TP): < 90 ug/L Chlorophyll-a: < 30 ug/L Secchi Depth: > 0.7 meter

Pickerel Lake Total Phosphorus 800 Pickerel Lake-TP 700 Ecoregion Guideline 600 Pickerel Lake-OP 500 400 (ug/L) 300 200

Phosphorus Concentration Concentration Phosphorus 100 0 5/1/05 5/31/05 7/1/05 7/31/05 8/31/05 9/30/05 Date

Pickerel Lake Chlorophyll-a 450 ) 400 Pickerel Lake-Chlor-a 350 Ecoregion Guideline 300 250 200 150 100

Chlor-a Concentration (ug/L Concentration Chlor-a 50 0 5/1/05 5/31/05 7/1/05 7/31/05 8/31/05 9/30/05 Date

Pickerel Lake Secchi Depth Date 5/1/05 5/31/05 7/1/05 7/31/05 8/31/05 9/30/05 0 0.1 0.2 0.3 0.4 0.5 Pickerel Lake-Secch Depth

Secchi Depth (m) DepthSecchi 0.6 Ecoregion Guideline 0.7 0.8

Shell Rock River Watershed District Wenck May 2006 2005 Hydrologic Data Report Wenck Associates, Inc. 1800 Pioneer Creek Center Pickerel Lake Environmental Engineers Maple Plain, MN 55359 Bancroft Creek Site: SBC01- Bancroft Creek at Plaza St 2005 Stream Flow and Water Quality Summary Stream Water Quality and Loading Summary Drainage area (acres) 22,002 Runoff (inches) 5.37 Total Phosphorus FWMC (mg/L) (1) 0.10 Load (lbs): 2,772 Areal Load (lbs/acre) (2) 0.13 Orthophosphorus FWMC (mg/L) 0.06 Load (lbs): 1,645 Areal Load (lbs/acre) 0.07 Total S us pended S olids FWMC (mg/L) 48 Load (lbs): 1,289,916 Areal Load (lbs/acre) 59

Notes: 1. FWMC= Flow-weighted mean concentration 2. Phosphorus export coefficients from ag land in the Cedar River Basin range from 0.21 lbs/ acre to 0.64 lbs/ acre

2005 Flow Record Bancroft Creek 60

) 50 40 30 20 Discharge (cfs 10 0 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Shell Rock River Watershed District Wenck May 2006 Wenck Associates, Inc. 1800 Pioneer Creek Center Bancroft Creek Environmental Engineers Maple Plain, MN 55359 Figure A4 Bancroft Creek Ecoregion Guidelines* Total Phosphorus (TP): < 0.20 mg/L Site: SBC01- Bancroft Creek at Plaza St Total Suspended Solids (TSS): < 20 mg/L 2005 Stream Flow and Water Quality Summary Standards**: Dissolved Oxygen (DO): >5 mg/L 2005 Concentration Graphs

Bancroft Creek Phosphorus TP OP 0.50 Ecoregion Guideline 0.40

0.30

0.20

0.10 Phosphorus (mg/L) Phosphorus

0.00 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Bancroft Creek Total Suspended Solids TSS 350 Ecoregion Guideline

280

210

140 TSS (mg/L) TSS 70

0 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Bancroft Creek Dissolved Oxygen DO 15 Water Quality Standard

6 DO (mg/L) 3

0 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

*Ecoregion TP & TSS guidelines are median 1986-1992 annual values for Western Corn Belt Plains streams. Source: McCollor & Heiskary, 1993 **Standards shown for DO are Chronic Aquatic Life Standards for Class 2B Waters. Source: MN Rules 7050.0222 Subpart 4. Shell Rock River Watershed District Wenck May 2006 Wenck Associates, Inc. 1800 Pioneer Creek Center Bancroft Creek Environmental Engineers Maple Plain, MN 55359 SBC01 Fountain Lake Dam Site: SFL01- Fountain Lake Dam Stream Water Quality and 2005 Stream Flow and Water Quality Summary Loading Summary Drainage area (acres) 62,061 Runoff (inches) 3.82 Total Phosphorus FWMC (mg/L) (1) 0.17 Load (lbs): 9,016 Areal Load (lbs/acre) (2) 0.15 Orthophosphorus FWMC (mg/L) 0.03 Load (lbs): 1,631 Areal Load (lbs/acre) 0.03 Total Suspended Solids FWMC (mg/L) 34 Load (lbs): 1,840,792 Areal Load (lbs/acre) 30

Notes: 1. FWMC= Flow-weighted mean concentration 2. Phosphorus export coefficients from ag land in the Cedar River Basin range from 0.21 lbs/ acre to 0.64 lbs/ acre

2005 Flow Record Fountain Lake Dam 200

) 150

100

Discharge (cfs 50

0 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Shell Rock River Watershed District Wenck May 2006 Wenck Associates, Inc. 1800 Pioneer Creek Center Figure A5 Fountain Lake Dam Environmental Engineers Maple Plain, MN 55359 Fountain Lake Dam Ecoregion Guidelines* Total Phosphorus (TP): < 0.20 mg/L Site: SFL01- Fountain Lake Dam Total Suspended Solids (TSS): < 20 mg/L 2005 Stream Flow and Water Quality Summary Standards**: Dissolved Oxygen (DO): >5 mg/L 2005 Concentration Graphs Fountain Lake Dam Phosphorus 0.50 TP 0.40 OP Ecoregion Guideline 0.30

0.20

Phosphorus (mg/L) Phosphorus 0.10

0.00 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Fountain Lake Dam Total Suspended Solids 75 TSS 60 Ecoregion Guideline 45

30 TSS (mg/L) 15

0 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Fountain Lake Dam Dissolved Oxygen

15 DO 12

) Water Quality Standard /L

g 9 m ( 6

DO 3 0 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

TABLE 3-34. CURRENT BOAT IMPACTS FROM EXISTING HOMES, RESORTS, CAMPGROUNDS AND PUBLIC ACCESS POINTS.

Current Boat Impact Impact of 10' Distance to >10 Group # # of Homes Number of Paths Wide Channels ft water (ft) (ft2) Ingress/ Egress Impacts 1 28 1000 4 40000 2 2 1320 3 39600 3 8 2640 1 26400 4 1 390 1 3900 5 5 5280 0 6 28 265 28 74200 7 21 525 21 110250 8 7 395 7 27650 9 (See Table 3-35: Blue Heron Bay Development) 10 3 525 3 15750 11 10 925 3 27750 12 9 2640 2 52800 13 46 265 46 121900 14 2 2000 1 20000 15 16 660 16 105600 16 3 660 3 19800 17 3 2640 2 52800 18 4 525 4 21000 19 9 790 4 31600 20 1 660 1 6600 21 14 925 5 46250 22 19 1050 3 31500 239 26080 158 Ingress/Egress Impact (ft2): 875350 Acres: 20.1 In-Lake Impacts Impact of 30' Length of Channel # Width of Channel Wide Channel Channels (ft2) 1 1650 30 49500 2 5950 30 178500 3 5280 30 158400 4 1980 30 59400 14860 In-Lake Impacts (ft2): 445800 Acres: 10.2 Total Current Impact (ft2): 1321150 Acres: 30.3

T:\1589\01\EIS WENCK VERSION\EIS - June 2006.doc 3-68 Draft Environmental Impact Statement Blue Heron Bay on Dead Lake June 2006

Goose Creek Site: SGC01- Goose Creek at Bridge Ave 2005 Stream Flow and Water Quality Summary Stream Water Quality and Loading Summary Drainage area (acres) 3,607 Runoff (inches) 5.13 Total Phosphorus FWMC (mg/L) (1) 0.34 Load (lbs): 1,426 Areal Load (lbs/acre) (2) 0.40 Orthophosphorus FWMC (mg/L) 0.18 Load (lbs): 741 Areal Load (lbs/acre) 0.21 Total Suspended Solids FWMC (mg/L) 15 Load (lbs): 63,861 Areal Load (lbs/acre) 18

Notes: 1. FWMC= Flow-weighted mean concentration 2. Phosphorus export coefficients from ag land in the Cedar River Basin range from 0.21 lbs/ acre to 0.64 lbs/ acre

2005 Flow Record Goose Creek 30

) 25 20 15 10 Discharge (cfs 5 0 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Shell Rock River Watershed District Wenck May 2006 Wenck Associates, Inc. 1800 Pioneer Creek Center Goose Creej Environmental Engineers Maple Plain, MN 55359 Figure A6 Goose Creek Ecoregion Guidelines* Total Phosphorus (TP): < 0.20 mg/L Site: SGC01- Goose Creek at Bridge Ave Total Suspended Solids (TSS): < 20 mg/L 2005 Stream Flow and Water Quality Summary Standards**: Dissolved Oxygen (DO): >5 mg/L 2005 Concentration Graphs

Goose Creek Phosphorus

TP 1.00 OP Ecoregion Guideline 0.80

0.60

0.40

Phosphorus (mg/L) Phosphorus 0.20

0.00 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Goose Creek Total Suspended Solids

150 TSS Ecoregion Guideline 120

60 TSS (mg/L) TSS 30

0 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Goose Creek Dissolved Oxygen

DO 15 Water Quality Standard 12

6 DO (mg/L)DO 3

0 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

*Ecoregion TP & TSS guidelines are median 1986-1992 annual values for Western Corn Belt Plains streams. Source: McCollor & Heiskary, 1993 **Standards shown for DO are Chronic Aquatic Life Standards for Class 2B Waters. Source: MN Rules 7050.0222 Subpart 4. Shell Rock River Watershed District Wenck May 2006 Wenck Associates, Inc. 1800 Pioneer Creek Center Goose Creek Environmental Engineers Maple Plain, MN 55359 Figure A6 Mud Creek Site: SMC01- Mud Creek at Co Rd 71 2005 Stream Flow and Water Quality Summary Stream Water Quality and Loading Summary Drainage area (acres) 4,320 Runoff (inches) 4.87 Total Phosphorus FWMC (mg/L) (1) 0.08 Load (lbs): 392 Areal Load (lbs/acre) (2) 0.09 Orthophosphorus FWMC (mg/L) 0.05 Load (lbs): 233 Areal Load (lbs/acre) 0.05 Total Suspended Solids FWMC (mg/L) 21 Load (lbs): 101,269 Areal Load (lbs/acre) 23

Notes: 1. FWMC= Flow-weighted mean concentration 2. Phosphorus export coefficients from ag land in the Cedar River Basin range from 0.21 lbs/ acre to 0.64 lbs/ acre

2005 Flow Record Mud Creek 12

) 10 8 6 4 Discharge (cfs 2 0 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Shell Rock River Watershed District Wenck May 2006 Wenck Associates, Inc. 1800 Pioneer Creek Center Mud Creek Environmental Engineers Maple Plain, MN 55359 Figure A7 Mud Creek Ecoregion Guidelines* Total Phosphorus (TP): < 0.20 mg/L Site: SMC01- Mud Creek at Co Rd 71 Total Suspended Solids (TSS): < 20 mg/L 2005 Stream Flow and Water Quality Summary Standards**: Dissolved Oxygen (DO): >5 mg/L 2005 Concentration Graphs

Mud Creek Phosphorus 0.50 TP 0.40 OP Ecoregion Guideline 0.30

0.20

Phosphorus (mg/L) Phosphorus 0.10

0.00 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Mud Creek Total Suspended Solids 150 TSS 120 Ecoregion Guideline

60 TSS (mg/L) TSS

0 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Mud Creek Dissolved Oxygen

DO 15 Water Quality Standard 12

6 DO (mg/L)DO 3

0 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

*Ecoregion TP & TSS guidelines are median 1986-1992 annual values for Western Corn Belt Plains streams. Source: McCollor & Heiskary, 1993 **Standards shown for DO are Chronic Aquatic Life Standards for Class 2B Waters. Source: MN Rules 7050.0222 Subpart 4. Shell Rock River Watershed District Wenck May 2006 Wenck Associates, Inc. 1800 Pioneer Creek Center Mud Creek Environmental Engineers Maple Plain, MN 55359 Figure A7 Peter Lund Creek Site: SPL01- Peter Lund Creek at T-281 2005 Stream Flow and Water Quality Summary Stream Water Quality and Loading Summary Drainage area (acres) 18,448 Runoff (inches) 4.09 Total Phosphorus FWMC (mg/L) (1) 0.11 Load (lbs): 1,819 Areal Load (lbs/acre) (2) 0.10 Orthophosphorus FWMC (mg/L) 0.08 Load (lbs): 1,402 Areal Load (lbs/acre) 0.08 Total Suspended Solids FWMC (mg/L) 20 Load (lbs): 346,303 Areal Load (lbs/acre) 19

Notes: 1. FWMC= Flow-weighted mean concentration 2. Phosphorus export coefficients from ag land in the Cedar River Basin range from 0.21 lbs/ acre to 0.64 lbs/ acre

2005 Flow Record Peter Lund Creek 50

) 40 30 20

Discharge (cfs 10 0 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Shell Rock River Watershed District Wenck May 2006 Wenck Associates, Inc. 1800 Pioneer Creek Center Peter Lund Creek Environmental Engineers Maple Plain, MN 55359 Figure A8 Peter Lund Creek Ecoregion Guidelines* Total Phosphorus (TP): < 0.20 mg/L Site: SPL01- Peter Lund Creek at T-281 Total Suspended Solids (TSS): < 20 mg/L 2005 Stream Flow and Water Quality Summary Standards**: Dissolved Oxygen (DO): >5 mg/L 2005 Concentration Graphs Peter Lund Creek Phosphorus

1.00 TP OP 0.80 Ecoregion Guideline 0.60

0.40

Phosphorus (mg/L) Phosphorus 0.20

0.00 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Peter Lund Creek Total Suspended Solids

350 TSS 280 Ecoregion Guideline

210

140 TSS (mg/L) TSS 70

0 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Peter Lund Creek Total Dissolved Oxygen

15 DO 12 Water Quality Standard 9

6 DO (mg/L) 3

0 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

*Ecoregion TP & TSS guidelines are median 1986-1992 annual values for Western Corn Belt Plains streams. Source: McCollor & Heiskary, 1993 **Standards shown for DO are Chronic Aquatic Life Standards for Class 2B Waters. Source: MN Rules 7050.0222 Subpart 4. Shell Rock River Watershed District Wenck May 2006 Wenck Associates, Inc. 1800 Pioneer Creek Center Peter Lund Creek Environmental Engineers Maple Plain, MN 55359 Figure A8 Schoff Creek (Arena Rd) Site: SSC01- Schoff Creek at Arena Road 2005 Stream Flow and Water Quality Summary Stream Water Quality and Loading Summary Drainage area (acres) 7,887 Runoff (inches) 3.92 Total Phosphorus FWMC (mg/L) (1) 0.30 Load (lbs): 2,108 Areal Load (lbs/acre) (2) 0.27 Orthophosphorus FWMC (mg/L) 0.04 Load (lbs): 251 Areal Load (lbs/acre) 0.03 Total Suspended Solids FWMC (mg/L) 121 Load (lbs): 847,962 Areal Load (lbs/acre) 108

Notes: 1. FWMC= Flow-weighted mean concentration 2. Phosphorus export coefficients from ag land in the Cedar River Basin range from 0.21 lbs/ acre to 0.64 lbs/ acre

2005 Flow Record Schoff Creek 30

) 25 20 15 10 Discharge (cfs 5 0 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Shell Rock River Watershed District Wenck May 2006 Wenck Associates, Inc. 1800 Pioneer Creek Center Schoff Creek Environmental Engineers Maple Plain, MN 55359 Figure A9 Schoff Creek (Arena Rd) Ecoregion Guidelines* Total Phosphorus (TP): < 0.20 mg/L Site: SSC01- Schoff Creek at Arena Road Total Suspended Solids (TSS): < 20 mg/L 2005 Stream Flow and Water Quality Summary Standards**: Dissolved Oxygen (DO): >5 mg/L 2005 Concentration Graphs Schoff Creek Phosphorus

0.75 TP 0.60 OP Ecoregion Guideline 0.45

0.30

Phosphorus (mg/L) Phosphorus 0.15

0.00 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Schoff Creek Total Suspended Solids

200 TSS Ecoregion Guideline 160

120

80 TSS (mg/L) TSS 40

0 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Schoff Creek Total Dissolved Oxygen

15 DO Water Quality Standard 12

6 DO (mg/L) 3

0 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

*Ecoregion TP & TSS guidelines are median 1986-1992 annual values for Western Corn Belt Plains streams. Source: McCollor & Heiskary, 1993 **Standards shown for DO are Chronic Aquatic Life Standards for Class 2B Waters. Source: MN Rules 7050.0222 Subpart 4. Shell Rock River Watershed District Wenck May 2006 Wenck Associates, Inc. 1800 Pioneer Creek Center Schoff Creek Environmental Engineers Maple Plain, MN 55359 Figure A9 Northeast Creek Site: SNE01- Northeast Creek at I-90 Rest Stop 2005 Stream Flow and Water Quality Summary Stream Water Quality and Loading Summary Drainage area (acres) 2,108 Runoff (inches) 2.67 Total Phosphorus FWMC (mg/L) (1) 0.13 Load (lbs): 171 Areal Load (lbs/acre) (2) 0.08 Orthophosphorus FWMC (mg/L) 0.12 Load (lbs): 154 Areal Load (lbs/acre) 0.07 Total Suspended Solids FWMC (mg/L) 41 Load (lbs): 51,580 Areal Load (lbs/acre) 24

Notes: 1. FWMC= Flow-weighted mean concentration 2. Phosphorus export coefficients from ag land in the Cedar River Basin range from 0.21 lbs/ acre to 0.64 lbs/ acre

2005 Flow Record Northeast Creek

4 3.5 3 2.5 2 1.5 1 Discharge (cfs) 0.5 0 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Shell Rock River Watershed District Wenck May 2006 Wenck Associates, Inc. 1800 Pioneer Creek Center Northeast Creek Environmental Engineers Maple Plain, MN 55359 Figure A10 Northeast Creek Ecoregion Guidelines* Total Phosphorus (TP): < 0.20 mg/L Site: SNE01- Northeast Creek at I-90 Rest Stop Total Suspended Solids (TSS): < 20 mg/L 2005 Stream Flow and Water Quality Summary Standards**: Dissolved Oxygen (DO): >5 mg/L 2005 Concentration Graphs Northeast Creek Phosphorus

0.50 TP OP Ecoregion Guideline 0.40

0.30

0.20

Phosphorus (mg/L) Phosphorus 0.10

0.00 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Northeast Creek Total Suspended Solids

TSS 200 Ecoregion Guideline 160

120

80 TSS (mg/L) TSS 40

0 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Northeast Creek Total Dissolved Oxygen

15 DO Water Quality Standard 12

6 DO (mg/L)DO 3

0 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

*Ecoregion TP & TSS guidelines are median 1986-1992 annual values for Western Corn Belt Plains streams. Source: McCollor & Heiskary, 1993 **Standards shown for DO are Chronic Aquatic Life Standards for Class 2B Waters. Source: MN Rules 7050.0222 Subpart 4. Shell Rock River Watershed District Wenck May 2006 Wenck Associates, Inc. 1800 Pioneer Creek Center Northeast Creek Environmental Engineers Maple Plain, MN 55359 Figure A10 Shell Rock River at Albert Lea Lake Outlet Site: SSR01- Shell Rock River 2005 Stream Flow and Water Quality Summary Stream Water Quality and Loading Summary Drainage area (acres) 90,560 Runoff (inches) 5.22 Total Phosphorus FWMC (mg/L) (1) 0.17 Load (lbs): 18,183 Areal Load (lbs/acre) (2) 0.20 Orthophosphorus FWMC (mg/L) 0.01 Load (lbs): 1,373 Areal Load (lbs/acre) 0.02 Total Suspended Solids FWMC (mg/L) 31 Load (lbs): 3,322,328 Areal Load (lbs/acre) 37

Notes: 1. FWMC= Flow-weighted mean concentration 2. Phosphorus export coefficients from ag land in the Cedar River Basin range from 0.21 lbs/ acre to 0.64 lbs/ acre

2005 Flow Record Shell Rock River at Albert Lea Lake Outlet 700 600 ) 500 400 300 200 Discharge (cfs 100 0 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Shell Rock River Watershed District Wenck May 2006 Wenck Associates, Inc. 1800 Pioneer Creek Center Shell Rock River at Albert Lea Lake Outlet Environmental Engineers Maple Plain, MN 55359 Figure A11 Shell Rock River at Albert Lea Lake Outlet Ecoregion Guidelines* Total Phosphorus (TP): < 0.20 mg/L Site: SSR01- Shell Rock River Total Suspended Solids (TSS): < 20 mg/L 2005 Stream Flow and Water Quality Summary Standards**: Dissolved Oxygen (DO): >5 mg/L

Shell2005 Rock River Concentration Albert Lea Lake Outlet Graphs Phosphorus

1.00 TP 0.80 OP Ecoregion Guideline 0.60

0.40

Phosphorus (mg/L) Phosphorus 0.20

0.00 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Shell Rock River Albert Lea Lake Outlet Total Suspended Solids

350 TSS Ecoregion Guideline 280

210

140 TSS (mg/L) TSS 70

0 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Shell Rock River Albert Lea Lake Outlet Dissolved Oxygen

6 DO (mg/L) 3 DO Water Quality Standard 0 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

*Ecoregion TP & TSS guidelines are median 1986-1992 annual values for Western Corn Belt Plains streams. Source: McCollor & Heiskary, 1993 **Standards shown for DO are Chronic Aquatic Life Standards for Class 2B Waters. Source: MN Rules 7050.0222 Subpart 4. Shell Rock River Watershed District Wenck May 2006 Wenck Associates, Inc. 1800 Pioneer Creek Center Shell Rock River at Albert Lea Lake Outlet Environmental Engineers Maple Plain, MN 55359 Figure A11 Shell Rock River at Glenville Site: SSR02- Shell Rock River at Glenville 2005 Stream Flow and Water Quality Summary Stream Water Quality and Loading Summary Drainage area (acres) 95,519 Runoff (inches) 5.79 Total Phosphorus FWMC (mg/L) (1) 0.23 Load (lbs): 28,266 Areal Load (lbs/acre) (2) 0.30 Orthophosphorus FWMC (mg/L) 0.13 Load (lbs): 16,753 Areal Load (lbs/acre) 0.18 Total Suspended Solids FWMC (mg/L) 27 Load (lbs): 3,381,543 Areal Load (lbs/acre) 35

Notes: 1. FWMC= Flow-weighted mean concentration 2. Phosphorus export coefficients from ag land in the Cedar River Basin range from 0.21 lbs/ acre to 0.64 lbs/ acre

2005 Flow Record Shell Rock River at Glenville 800 700 ) 600 500 400 300

Discharge (cfs 200 100 0 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Shell Rock River Watershed District Wenck May 2006 Wenck Associates, Inc. 1800 Pioneer Creek Center Shell Rock River at Glenville Environmental Engineers Maple Plain, MN 55359 Figure A12 Shell Rock River at Glenville Ecoregion Guidelines* Total Phosphorus (TP): < 0.20 mg/L Site: SSR02- Shell Rock River at Glenville Total Suspended Solids (TSS): < 20 mg/L 2005 Stream Flow and Water Quality Summary Standards**: Dissolved Oxygen (DO): >5 mg/L 2005 Concentration Graphs

Shell Rock River at Glenville Phosphorus

1.50 TP 1.20 OP Ecoregion Guideline 0.90

0.60

Phosphorus (mg/L) Phosphorus 0.30

0.00 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Shell Rock River at Glenville Total Suspended Solids

500 TSS 400 Ecoregion Guideline 300

200 TSS (mg/L) TSS 100

0 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Shell Rock River at Glenville Dissolved Oxygen

15 DO 12 Water Quality Standard

6 DO (mg/L) 3

0 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

*Ecoregion TP & TSS guidelines are median 1986-1992 annual values for Western Corn Belt Plains streams. Source: McCollor & Heiskary, 1993 **Standards shown for DO are Chronic Aquatic Life Standards for Class 2B Waters. Source: MN Rules 7050.0222 Subpart 4. Shell Rock River Watershed District Wenck May 2006 Wenck Associates, Inc. 1800 Pioneer Creek Center Shell Rock River at Glenville Environmental Engineers Maple Plain, MN 55359 Figure A12 Wedge Creek Site: SWC01- Wedge Creek 2005 Stream Flow and Water Quality Summary Stream Water Quality and Loading Summary Drainage area (acres) 21,065 Runoff (inches) 3.73 Total Phosphorus FWMC (mg/L) (1) 0.17 Load (lbs): 3,051 Areal Load (lbs/acre) (2) 0.14 Orthophosphorus FWMC (mg/L) 0.06 Load (lbs): 1,150 Areal Load (lbs/acre) 0.05 Total Suspended Solids FWMC (mg/L) 60 Load (lbs): 1,069,805 Areal Load (lbs/acre) 51

Notes: 1. FWMC= Flow-weighted mean concentration 2. Phosphorus export coefficients from ag land in the Cedar River Basin range from 0.21 lbs/ acre to 0.64 lbs/ acre

2005 Flow Record Wedge Creek 70

Discharge (cfs) Discharge 20

0 May-05 Jun-05 Jul-05 Aug-05 Sep-05

Shell Rock River Watershed District Wenck May 2006 Wenck Associates, Inc. 1800 Pioneer Creek Center Wedge Creek Environmental Engineers Maple Plain, MN 55359 Figure A13 Wedge Creek Ecoregion Guidelines* Site: SWC01-Wedge Creek Total Phosphorus (TP): < 0.20 mg/L Total Suspended Solids (TSS): < 20 mg/L 2005 Stream Flow and Water Quality Summary Standards**: Dissolved Oxygen (DO): >5 mg/L 2005 Concentration Graphs

Wedge Creek Phosphorus

0.50 TP OP Ecoregion Guideline 0.40

0.30

0.20

Phosphorus (mg/L) 0.10

0.00 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Wedge Creek Total Suspended Solids

200 TSS Ecoregion Guideline 160

120

80 TSS (mg/L) TSS 40

0 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Wedge Creek Dissolved Oxygen

15 DO Water Quality Standard 12

6 DO (mg/L) DO 3

0 Apr-05 May-05 Jun-05 Jul-05 Aug-05 Sep-05 Oct-05

Lake Modeling Results