Download - Truesdale Lake Lake Management Plan
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Truesdale LakeLake Management Plan
Truesdale Lake AssociationSouth Salem, NY
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Truesdale Lake Evaluation
Introduction to
Land-Tech Consultants, Inc. Project overview Summary of findings Questions
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Project Objectives
Conduct bathymetry study Collect sediment for analysis Review Citizens Statewide Lake Assessment
Program (CSLAP) Findings (monitoring since 1999)
Evaluate data and provide management recommendations
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Watershed
83 Acre lakeCreated in 1927
Receives water from surface runoff and primary streams
Discharges to 200 ft wide dam with spillway
2,380 Acre Watershed
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Sediment
11+ feet deep 0-1.5 ft sediment
accumulated since 1956
Sediment68% Gray Sand
29% Silt
3% Gravel
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Water Quality
Class B water (recreation, fishing) High phosphorous (0.018-0.084 mg/l) High chlorophyll a (37.1 ug/l) Secchi disk - average= 1.15 m Eutrophic High sediment phosphorous
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Weed Control
Curly-leaf pondweed (Potmogeton crispus) Leafy pondweed (P. foliosus) Filamentous algae Nitella found in southern cove Aquathol K and copper sulfate treatments Effective control Long use of copper sulfate (45 years) – concern Recommend copper and fish monitoring
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Summary Of Existing Conditions
High landscape, scenic and recreational values Managed system Sedimentation concerns High phosphorous and chlorophyll a levels Effective weed and algal control program
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Recommendations
A -Shoreline Buffer Install adequate shoreline vegetative buffers of
native shrubs and grasses 15-25 foot wide buffer Slow down overland runoff Uptake of nutrients – compete for nutrients
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Vegetative Buffer
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Dense buffer
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Recommendations
B – Aquatic buffer Introduce rooted emergents along shoreline
– Take up and compete for nutrients– Increase aesthetics– Create escape cover for fish
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Typical Plants
Pickerel weed (Pontederia cordata) Bur-reed (Sparganium sp.) Three-square rush (Scirpus pugens) Common arrowhead (Sagittaria latifolia) Sweet flag (Acorus calamus) Blue flag (Iris versicolor) Soft rush (Juncus effusus)
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RecommendationsC – Fertilizer Use Test soil for nutrient content Apply minimal fertilizer based on nutrient needs Water soluble – minimize use near open water and
prior to heavy rain Apply only needed amounts of phosphorous Mulch grass clippings Use organic slow release fertilizer Apply annually
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Recommendations
D – Control Phosphorous Sources Maintain septic systems Discourage Canada geese use on lawns
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Recommendations
E – Address “Hot Spots” #1 South end of lake – 18” discharge pipe #2 Catch basin at Truesdale Lake Drive and
Lakeshore Drive #3 Beach along eastern shoreline #4 Channel under Boway Road #5 Inlet watercourse #6 Discharge channel at western shoreline
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Area #1 Relocate end of pipe
further from lake Create plunge pool Create semi-circular
forebay in lake Introduce aquatic
vegetation Provide routine
maintenance (sediment removal)
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Area #2 Remove section of
pipe and replace with vegetated channel
Construct a small sediment basin and install rip rap channel to lake
Routine maintenance (sediment removal, erosion repair)
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Rip Rap Swale
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Sediment Basin
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Area #3 Clean out & vegetate
southern channel Construct settling
basin and forebays Remove un-used pipes Riprap northern
channel, add forebay Introduce aquatic
emergent vegetation Repair eroded areas Routine maintenance
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Area #4 Remove sand bars Construct multiple
sediment basins where accessible
Reconstruct channel – improve flow, protect from erosion, enhance appearance
Routine maintenance
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Area #5
Open up mouth Construct crescent-
shaped forebay Deepen brook Introduce aquatic
emergents Routine maintenance
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Area #6
Construct rip rap channel from pipe over steep slopes
Construct sediment basin in level area
Construct forebay in lake
Routine maintenance
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Stone Filter – if needed