Dead Pike Lake Management Plan Final Report

Transcription

1 Dead Pike Lake Management Plan Final Report Natural Resource Board April 11, 2018 Dan Helsel, Field Integration Leader Steve Apfelbaum, Chairman, Applied Ecological Service

2 Dead Pike Lake, Vilas County 2

3 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 April 2018: DNR Approved Lake Management Plan 3

4 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 4

5 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 5

6 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 6

7 Biological and Recreational Impacts 7

8 Dead Pike Lake Water Quality Goals Water Quality Parameter Phosphorus Phosphorus Load Iron In-Lake Iron Inflow Iron Load Secchi Disk Reduction Goal 12% 16% 20% 58% 50% 24% increase in clarity Existing Condition Goal 17 µg/l 15 µg/l 206 kg/yr 173 kg/l 1.2 mg/l 1.00 mg/l 3.5 mg/l 1.49 mg/l 53,222 kg/yr 26,611 kg/yr 6.88 feet 8.40 feet Chlorophyll -a Meets goal 4 µg/l < 4 µg/l 8

9 Lake Management Action Raise the Minimum Lake Elevation Raise bottom stream 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 9

10 Lake Management Action Construct Inflow Biofiltration System Initially use north-south 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 10

11 Lake Management Actions 11

12 Lake Planning Grant Objectives Near Term Conceptual Outlet Plans Conceptual Inflow Biofiltration Plans Supplemental Data Collection In-lake Habitat Evaluation 12

13 Implementation Steps Long Term Funding Package Permitting Construction Evaluation Monitoring 13

14 Conceptual Timeline 14

15 Questions 15