Dead Pike Lake Management Plan Final Report Natural Resource Board - PowerPoint PPT Presentation

Dead Pike Lake Management Plan Final Report Natural Resource Board April 11, 2018 AGENDA ITEM 4.B.2. Dan Helsel, Field Integration Leader Steve Apfelbaum, Chairman, Applied Ecological Service

Dead Pike Lake, Vilas County AGENDA ITEM 4.B.2. 2 Dan Helsel (DNR) & Steve Apfelbaum (AES)

Foundation December 2016: NRB Amendment to Powell Marsh Approval: Mr. Zimmer MOVED, seconded by Dr. Prehn, to amend the motion to direct the department to continue working with Dead Pike Lake Association to evaluate the conditions of Dead Pike Lake and develop a lake management plan to address water quality concerns. He asked that the department report back to the Natural Resources Board at the September 2017 meeting, which will be held in Minocqua, regarding progress on the lake management plan, including providing any water quality monitoring updates. Further, he would like the department to present an informational item on the finalized lake management plan by March 2018. April 2018: DNR Approved Lake Management Plan AGENDA ITEM 4.B.2. Dan Helsel (DNR) & Steve Apfelbaum (AES) 3

Developing the Plan • Monthly meetings January 2017 – March 2018 • Association, Town & DNR • ~ $20,000 surface water quality monitoring • ~ $75,000 Contract with Applied Ecological Services • Field and technical assistance from Lake Association, Town, AES, DNR Wildlife, DNR Water Quality, DNR Groundwater, UW-Trout Lake, and USGS AGENDA ITEM 4.B.2. 4 Dan Helsel (DNR) & Steve Apfelbaum (AES)

Water Quality Framework Groundwater • Naturally high in iron and phosphorus ~ 85% of iron load and ~ 65% of the phosphorus load • Lower lake levels causes increased groundwater inflow • Raising the minimum lake level decreases groundwater iron and phosphorus input AGENDA ITEM 4.B.2. 5 Dan Helsel (DNR) & Steve Apfelbaum (AES)

Water Quality Framework Surface Water • Powell Marsh State Wildlife Area ditches increase the connection between groundwater and surface water • Source of iron and phosphorus to Dead Pike Lake ~ 15% of iron load and ~ 35% of the phosphorus load • Iron and phosphorus are transported with organic matter • Biofiltration of inflow will decrease iron and phosphorus inputs AGENDA ITEM 4.B.2. 6 Dan Helsel (DNR) & Steve Apfelbaum (AES)

Biological and Recreational Impacts AGENDA ITEM 4.B.2. 7 Dan Helsel (DNR) & Steve Apfelbaum (AES)

Dead Pike Lake Water Quality Goals Water Quality Reduction Existing Parameter Goal Condition Goal Phosphorus 12% 17 µ g/L 15 µ g/L Phosphorus Load 16% 206 kg/yr 173 kg/L Iron In-Lake 20% 1.2 mg/L 1.00 mg/L Iron Inflow 58% 3.5 mg/L 1.49 mg/L Iron Load 50% 53,222 kg/yr 26,611 kg/yr Secchi Disk 24% increase 6.88 feet 8.40 feet in clarity Chlorophyll -a Meets goal 4 µ g/L < 4 µ g/L AGENDA ITEM 4.B.2. 8 Dan Helsel (DNR) & Steve Apfelbaum (AES)

Lake Management Action • Raise bottom stream Raise the Minimum Lake Elevation elevation up to 1 foot • Maximum lake level lower than ordinary high water mark • Reversible, temporary structure • Maintain high flow capacity • Monitor visible iron floc accumulation, flows, lake elevations • Evaluate and adapt AGENDA ITEM 4.B.2. Dan Helsel (DNR) & Steve Apfelbaum (AES) 9

Lake Management Action • Initially use north-south Construct Inflow Biofiltration System ditch without stream history • Construction activities within artificial ditch • Compatible with PMSWA Master Plan • Maintain minimum flow requirements • Reversible construction • Monitor transparency phosphorus, iron and flows • Evaluate and Adapt AGENDA ITEM 4.B.2. 10 Dan Helsel (DNR) & Steve Apfelbaum (AES)

Lake Management Actions AGENDA ITEM 4.B.2. 11 Dan Helsel (DNR) & Steve Apfelbaum (AES)

Lake Planning Grant Objectives • Near Term – Conceptual Outlet Plans – Conceptual Inflow Biofiltration Plans – Supplemental Data Collection – In-lake Habitat Evaluation AGENDA ITEM 4.B.2. Dan Helsel (DNR) & Steve Apfelbaum (AES) 12

Implementation Steps • Long Term – Funding Package – Permitting – Construction – Evaluation Monitoring AGENDA ITEM 4.B.2. Dan Helsel (DNR) & Steve Apfelbaum (AES) 13

Conceptual Timeline AGENDA ITEM 4.B.2. 14 Dan Helsel (DNR) & Steve Apfelbaum (AES)

Questions AGENDA ITEM 4.B.2. 15 Dan Helsel (DNR) & Steve Apfelbaum (AES)