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Chetek Lakes Diagnostic and Feasibility Study Barr Engineering Company August 2, 2009 Annual Meeting
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Overview Lake Water Quality Basics Why Study? Study Details CLPA Volunteers Needed
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How Does Phosphorus Affect WQ? Increase in Phosphorus Increase in Algae Lake gets Greener Secchi Disc reading Decreases
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Phosphorus Sources Watershed Sediment Rainfall Groundwater
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How Do Sediments Add Phosphorus to Lakes? Really low oxygen at bottom Phosphorus released from sediments Phosphorus mixed throughout lake from BoatsWind Fall Temperature Change
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Watershed Phosphorus Loading Rain Runoff Phosphorus to Lake
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Why Study? Secchi Disc readings Decreased Since 1996 – Why? Lake Sediment Study Needed Lake on 303d list of impaired waters
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Study Details Phase 1 Habitat Study Monitoring Phase 2 Internal Load Study Modeling Management Plan
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Phase 1
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DNR Habitat Maps Aquatic Plant Sensitive Areas Coarse Rock Rubble Habitat Areas for Walleyes Coarse woody debris habitat Shoreline buffers/restoration areas
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Sediment Monitoring - Barr Mud - 7 cores Prairie – 18 cores Pokegama – 7 cores Chetek – 8 cores Ten Mile – 6 cores Total of 46 cores
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Sediment Monitoring - Barr Discover exactly how much phosphorus is in the lake sediments by measuring it
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Tributary Monitoring - USGS Flow – 2 years Phosphorus – 1 year
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Lake Monitoring 7 Times Per Year – USGS Volunteers – Weekly – June- Sept. Chetek – 2 years Other Lakes – 1 year
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Other Monitoring - USGS Recording Stage Gage Recording Precipitation Gages 10 Groundwater Piezometers
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Phase 2
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Phase 2 – Internal Phosphorus Load Study Phosphorus release rates – low oxygen or high pH Boat propellor resuspension
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Modeling Components How much Water enters the lake? How much Phosphorus enters the lake? Where does the Phosphorus come from? How much can Water Quality improve?
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Management Plan Set Goals Watershed Management Internal Load Management Habitat Management Committee & Public Meetings CLPA Approval, WDNR Approval
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What comes next? Projects from the management plan Projects that improve water quality
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Schedule Phase 1 - 2010 to 2013 Phase 2 - 2011 to 2013
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Study Cost About $290,000 for Phase 1 Estimate Similar Cost for Phase 2 About $580,000 for Study About $116,000 per lake
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Funding Sources Two DNR Lake Protection Grants of $200,000 Each USGS Funds 35% of USGS Project CLPA $10,000 for Each Phase
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CLPA Cost About $10,000 for Phase 1 About $10,000 for Phase 2
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Volunteers Needed Lake Sampling Stream Sampling Sediment Sampling
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Support Contact CLPA President John Plaza Support? Feedback?
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Next Steps Meet With DNR Apply for Lake Protection Grant Funds Find Volunteers
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