Lake Pocotopaug Lake and Watershed Restoration Evaluation ...

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Lake Pocotopaug Restoration Evaluation 14May 2002
3.3 Lake FeaturesLake Pocotopaug is an enlarged pond resulting from the construction of a dam in the 1700’s(Loomis 2002). Lake Pocotopaug has a surface area of 511.7 acres (Fugro 1993). Thewatershed:lake surface area ratio is 4.7:1.There are two deep basins located in the northern portion of the lake. The western basin,Oakwood, has a maximum depth of approximately 11 meters. The eastern basin isapproximately nine meters in depth. The latest bathymetric map, published in the Frink andNorvell (1984) report, is provided in Figure 4. The southern portion of the lake is relativelyshallow. Mean depth of Lake Pocotopaug is 3.4 meters. Lake volume varies depending on thereference publication. Fugro (1993) shows a lake volume of 7,131,805 m 3 , whereas the VLSGshows 7,132,239 m 3 (7,132,000 m 3 was used in calculations for this report).Lake bathymetry is irregular due to islands, shoals and large rock outcrops. Boating can bedifficult for lake users not familiar with these areas. Slopes are steep within the Oakwood basinand moderate in the Markham basin. The shallow area to the south likely contributes to laketurbidity due to wind mixing. The littoral area is mostly composed of rock, sand, and gravel withmuck dominating in the deeper areas.Recreational use of Lake Pocotopaug is extensive and varied. Boating of all kinds is verypopular. Motorized watercraft is the preferred method of transportation on the lake. There is apublic boat launch along the western shore. There are sandy beaches located on both theeastern and western shore for public and private use. Fishing is also popular at LakePocotopaug, and is generally practiced from boats. A Connecticut Trophy Award winningchannel catfish was caught in Lake Pocotopaug in 1999. Lake Pocotopaug was stocked withfingerling walleye in 2001 as part of a project to expand sport fishing diversity in the State ofConnecticut. Although a recent fishery study has not been performed in Lake Pocotopaug, thecurrent fish community is likely dominated by panfish (perch, bluegills, etc.). Recreationalactivities continue throughout the winter months with ice fishing, sailing, and skating. Asidefrom human uses, Lake Pocotopaug provides an ideal habitat for aquatic life. Plankton,vascular plants, amphibians, reptiles, invertebrates, fish, birds (both permanent and migratingspecies) and mammals depend on the lake as part of their habitat.Lake Pocotopaug Restoration Evaluation 15May 2002
Page 2 and 3: LAKE POCOTOPAUGLAKE AND WATERSHEDRE
Page 4 and 5: 11.3 Prevent algal blooms from occu
Page 6 and 7: LAYPERSON’S SYNOPSISLake Pocotopa
Page 8 and 9: The stocking of walleye in Lake Poc
Page 10 and 11: Lake Pocotopaug Restoration Evaluat
Page 12 and 13: Period Covered 1988• Pollution fr
Page 14 and 15: Recommendations included• Algacid
Page 16 and 17: Major EventDecember 1999 - Fish kil
Page 18 and 19: Table 5. Land Use from the CT DEP G
Page 22 and 23: Figure 4. Lake Pocotopaug Bathymetr
Page 24 and 25: Table 6. QA/QC on Water Quality Dat
Page 26 and 27: Soils - USDA at MAGIC UCONN Geograp
Page 28 and 29: Table 8. Water Quality Variables Me
Page 30 and 31: Lake Pocotopaug Restoration Evaluat
Page 32 and 33: Phytoplankton samples were collecte
Page 34 and 35: where many measurements would have
Page 36 and 37: Figure 7. 2001 Temperature and Diss
Page 38 and 39: Table 10 continued. 2001 Lake Pocot
Page 40 and 41: phytoplankton biomass (Wetzel 1983)
Page 42 and 43: Figure 9. Annual June, July and Aug
Page 44 and 45: elow 7:1 occurred on September 22,
Page 46 and 47: Table 12. 2001 Dry and Wet Weather
Page 48 and 49: Table 12 continued. 2001 Dry and We
Page 56 and 57: were identified to genus and enumer
Page 58 and 59: Table 13 continued. 2001 Phytoplank
Page 68 and 69: Figure 10. 2001 Phytoplankton Bioma
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The late summer bloom of blue-green
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Table 15. 2001 Zooplankton DensityZ
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Table 16. 2001 Zooplankton BiomassZ
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7.0 RELATIONSHIPS AND TRENDS7.1 Pre
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Figure 13. 1991-2001 Surface Water
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Figure 15. 2001 Surface and Mid-dep
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Figure 16. 1991-2001 Chlorophyll a
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Figure 18. 2001 Chlorophyll a vs. S
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Figure 20. 1991-2001 July and Augus
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Table 17. Empirical Model Calculati
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Table 18. Total Phosphorus Loading
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Table 19. Wet Weather Loading Summa
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With the best possible treatment of
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water quality should focus on input
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10.0 MANAGEMENT NEEDS AND OBJECTIVE
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11.2 Reducing Total Phosphorus and
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undeveloped forest land, an opportu
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Figure 22. Buffer Strips for Pollut
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Figure 23. Catch Basin with Sump an
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early spring to capture what appear
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Figure 26. Infiltration Systems.Lak
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Figure 27. Constructed Treatment We
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Chemical TreatmentIn-stream chemica
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TABLE 21. MANAGEMENT OPTIONS FOR CO
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TABLE 21 continued. MANAGEMENT OPTI
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12.0 ADDITIONAL DATA NEEDSManagemen
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13.0 RECOMMENDED MANAGEMENT PROGRAM
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this point, but as a rough guide, a
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14.0 REFERENCESAd Hoc Lake Advisory
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Scheuler T.R., P.A. Kumble, & M.A.
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Appendix B:Supplemental Tables and
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Appendix D:Educational MaterialsLak
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