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Mitchell Lake Association 2011

Mitchell Lake Association 2011. Mark Enochs September 22, 2011. “One Water” Resource Management Citizen Leadership and Priority Resource Specific Restore and Protect Measureable Benefits. District Projects in Mitchell Lake…. 2008 & 2009: SolarBee pilot project for hypolimnetic mixing

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Mitchell Lake Association 2011

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  1. Mitchell Lake Association2011 Mark EnochsSeptember 22, 2011

  2. “One Water” Resource Management • Citizen Leadership and Priority • Resource Specific • Restore and Protect • Measureable Benefits

  3. District Projects in Mitchell Lake… 2008 & 2009: SolarBee pilot project for hypolimnetic mixing Result: Ineffective mixing 2008: Sediment Oxygen Demand sampling 2009: Community Sediment Oxygen Demand sampling 2009: • Hypolimnetic Oxygenation Pilot. Result: Successful • Calcium Peroxide Addition: Result: Positive, but inconclusive

  4. District Projects in Mitchell Lake… 2008: Weed Harvesting. 272 tons removed May: Curly leaf pondweed 2009: Weed Harvesting. 732 tons removed May: Curly leaf pondweed July: Eurasian water milfoil 2010: Weed Harvesting. 459 tons removed May: Curly leaf pondweed July: Eurasian water milfoil 1,462 tons total Thank you for weed survey input!

  5. 2011 Herbicide Treatment (almost) 2011 Herbicide Treatment

  6. 2011 Herbicide Treatment • MLA-initiated. Thank you • 2,4-D was to be used • MnDNR-classifies Mitchell as Natural Environment Lake • Thus, herbicide use by anyone in Mitchell is not permitted, including… • Individual homeowners • City • District • Others • MnDNR does allow the use of copper sulfate for algae or snail control, but not for submerged plant control

  7. 2011: Paleolimnology – Record of historic water quality from sediment cores www.laccore.org www.laccore.org www.also.org www.laccore.org

  8. Mitchell Lake Lake Reclamation Status 60 µg/l impaired water threshold 89 µg/l District Goal 40 µg/l Presettlement CurrentConditions STATE GOAL

  9. Mitchell Lake Recommendations • Sedimentation near presettlement value → Stormwater infrastructure is working • Sedimentation legacy responsible for current impairment • Short term (2012 to 2022): Improve water quality with in-lake methods to counter legacy • Long term (2022 - 2072): Incremental adoption of LID in watershed

  10. Current Status

  11. Current Status

  12. Lake Reclamation Alternatives

  13. Questions?

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