Mirror Lake Management District Mirror Lake Management Planning - - PowerPoint PPT Presentation

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Mirror Lake Management District Mirror Lake Management Planning - - PowerPoint PPT Presentation

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Wrap-Up Meeting Appendix A Mirror Lake Management District Mirror Lake Management Planning Project Wrap-Up Meeting June 21, 2014 Brenton Butterfield June 2014 1 Wrap-Up Meeting Appendix A Study and Plan Goals Collect & Analyze

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SLIDE 1

Wrap-Up Meeting Appendix A June 2014 1

Mirror Lake Management District

Brenton Butterfield

Mirror Lake

Management Planning Project Wrap-Up Meeting June 21, 2014

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Wrap-Up Meeting Appendix A June 2014 2

Onterra Onterra, LLC

LLC

Lake M Management gement Pla Planning ning

  • Collect & Analyze Data
  • Construct Long‐Term &

Useable Plan

Study and Plan Goals

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SLIDE 3

Wrap-Up Meeting Appendix A June 2014 3

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2012 Growing Season & Winter 2013: Data Collection & Analysis

  • Water Quality
  • Watershed
  • Shoreland
  • Aquatic Plants
  • Fishery
  • Stakeholder Survey

2013/2014: Develop management goals and finalize plan

Project Timeline

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SLIDE 4

Wrap-Up Meeting Appendix A June 2014 4

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Overall Project Results

  • Water Quality (nutrients and algae)
  • Limited historical data makes analysis difficult
  • Phosphorus is the primary nutrient controlling algae and other aquatic

plant growth

  • Phosphorus concentrations are high, but variable depending on

precipitation events (large watershed), ranging from fair to poor

  • While phosphorus is high, free-floating algae are not excessive (high

flushing rate/macrophytes)

  • Water clarity good to excellent for a shallow, lowland drainage lake
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Wrap-Up Meeting Appendix A June 2014 5

Land Cover Types

Forest Forested Wetlands Open Water Pasture/Grass Row Crops Rural Open Space Rural Residential Wetlands

Watershed

~67 square miles

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Wrap-Up Meeting Appendix A June 2014 6

Shoreline

Legend

Seawall

Masonary/Wood

ÉÉ ÉÉ ÉÉ ÉÉ ÉÉ ÉÉ ÉÉ ÉÉ ÉÉ ÉÉ ÉÉ ÉÉ É Rip-Rap

Natural/Undeveloped Developed-Semi-Natural Developed-Unnatural Urbanized Developed-Natural

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SLIDE 7

Wrap-Up Meeting Appendix A June 2014 7

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Overall Project Results

  • Watershed
  • Very large when compared to the lake (WS:LA of 302:1)
  • 43% comprised of forests; 36% comprised of row crops; 17% comprised
  • f pasture/grass
  • Modeling indicates ~79% of lake’s phosphorus budget comes from row

crop agriculture

  • Modeling predicted higher in-lake concentration of phosphorus than
  • bserved
  • Indication that watershed remediation is working
  • Modeling indicated even if watershed was entirely forested, lake would

still be highly productive (eutrophic)

  • Shoreline
  • Majority is in natural/undeveloped state
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SLIDE 8

Wrap-Up Meeting Appendix A June 2014 8

Aquatic Plants

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Wrap-Up Meeting Appendix A June 2014 9

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Overall Project Results

  • Aquatic Plant Community (native & non-native)
  • Native aquatic plant community is of high quality for the region and

comparable to other lakes state-wide

  • High native species richness (31 species)
  • High species diversity
  • 4 non-native, invasive species of concern: Eurasian water milfoil, curly-

leaf pondweed, pale-yellow iris, and Japanese knotweed

  • Excessive growth of duckweed (high nitrate levels)
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SLIDE 10

Wrap-Up Meeting Appendix A June 2014 10

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Floristic Quality Analysis

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SLIDE 11

Wrap-Up Meeting Appendix A June 2014 11

Duckweed & Watermeal

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Wrap-Up Meeting Appendix A June 2014 12

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Management Goal: Maintain and Enhance the Overall Ecological Health of Mirror Lake Management Actions

  • 1. Update the Mirror Lake Management Plan in 2018
  • 2012/2013 studies created baseline for future studies
  • Will reassess the health of Mirror Lake (water quality,

plants, etc.)

  • 2. Monitor water quality through WDNR Citizen Lake

Monitoring Network

  • Continuation of current effort
  • Collection at regular intervals builds a database that

can be used for long-term trends analysis

  • Also aids in early detection of potential problems
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Wrap-Up Meeting Appendix A June 2014 13

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Management Goal: Maintain and Enhance the Overall Ecological Health of Mirror Lake Management Actions

  • 3. The MLMD contracts with an environmental engineering

firm to reassess the previously dredged sedimentation basin in Upper Mirror Lake, the sedimentation basins created above the gullies around Mirror Lake, and to quantify the growth and potential removal of sand deltas at the mouths

  • f the gullies.
  • Navigational dredging and sedimentation basin created

in 2008; remediation of gullies in 2010

  • Reassess sediment trap (filling in?)
  • Reassess modifications made to gullies
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Wrap-Up Meeting Appendix A June 2014 14

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Management Goal: Control Aquatic Invasive Species in Mirror Lake and Prevent Future Introductions to and Spread from Mirror Lake

Management Actions

  • 1. Initiate volunteer-based monitoring of Eurasian water

milfoil and curly-leaf pondweed and other non-native species in Mirror Lake

  • Volunteer monitors to be recruited
  • Volunteers are trained in AIS ID by CLMN Program
  • Volunteers report findings to resource managers
  • 2. Initiate Clean Boats Clean Waters watercraft inspections at

Mirror Lake public boat landings

  • Volunteers attend CBCW training session & train others
  • Monitor boat landings during high-use weekends
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SLIDE 15

Wrap-Up Meeting Appendix A June 2014 15

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Management Goal: Maintain Navigation in Open Water and Near-Shore Areas on Mirror Lake Management Actions

1. Use district-owned mechanical harvester to maintain reasonable navigation on Mirror Lake

  • District reapplies for multi-year harvest permit in 2017
  • District harvests permitted areas of Mirror Lake as needed
  • District supplies summary report of harvesting activities

2. Selectively remove course woody habitat that inhibits reasonable navigation and recreational safety on Mirror Lake

  • MLMD and Mirror Lake State Park survey the lake annually and

select pieces of course woody habitat for removal if they inhibit reasonable navigation or present safety hazard to lake users

  • MLMD contracts with tree removal service to remove selected trees
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Wrap-Up Meeting Appendix A June 2014 16

Harvesting Plan

Proposed Harvesting Areas Primary Harvest Areas ~ 30 acres 30 ft Navigational Lane ~ 0.8 acres 50 ft Navigational Lane ~ 1.0 acres 30 ft Duckweed Harvesting Lane ~ 2.4 acres

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Wrap-Up Meeting Appendix A June 2014 17

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Additional Management Plan Items

Management Goal:

Assure and Enhance the Communication of the Mirror Lake Management District with Lake Stakeholders

Management Actions

  • 1. The MLMD and MLA will create and support a joint education

committee comprised of members from both groups

  • Provide lake-related information including safe boating,

water quality, public safety, AIS, catch and release fishing, and quality of life on Mirror Lake, etc.

  • Recruit volunteers from MLMD and MLA to form joint

education committee

  • MLMD and MLA board will identify base level of annual

financial support to fund education committee

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SLIDE 18

Wrap-Up Meeting Appendix A June 2014 18

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Wisconsin Lakes Partnership

Many of the graphics used in this presentation were supplied by:

Thank You

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