District Waterbodies

Forest Lake

Comfort Lake

Little Comfort Lake

Bone Lake

Moody Lake

Birch Lake

School Lake

Sylvan Lake

Shields Lake

 

Forest Lake Quick Facts

Lake Size: 2,270 acres
Watershed Drainage Area: 8,160 acres; land use varies from urban to suburban to rural/agriculture
Maximum Depth: 37 feet
Outlet Elevation: 901.35 feet
Low Water Level: 899.45 feet (1969)
High Water Level: 902.23 feet (1993)
Impairments: Aquatic consumption due to mercury and PCBs in fish tissue
Invasive Species (2016): Curlyleaf pondweed, flowering rush, Eurasian watermilfoil, zebra mussels

Water Quality (2016)

West Basin
Eutrophic, Lake Grade: C+
Summer average total phosphorus: 40 μg/L
Summer average Secchi disc: 1.32 meters
Summer chlorophyll-a: 18.8 μg/L
Middle Basin
Eutrophic, Lake Grade: C+
Summer average total phosphorus: 41 μg/L
Summer average Secchi disc: 1.73 meters
Summer chlorophyll-a: 16.7 μg/L
East Basin
Eutrophic, Lake Grade: C
Summer average total phosphorus: 44 μg/L
Summer average Secchi disc: 1.74 meters
Summer chlorophyll-a: 22.1 μg/L

Resource Goals

Short Term Goals - Year 2020

  • Maintain a water quality rating of C.
  • Maintain a five-year mean summer phosphorus concentration below 37 μg/L ± 4%.
  • Maintain a mean summer secchi depth no less than 5 ft

Long Range Goals - Year 2030

  • Maintain a water quality rating of at least C.
  • Maintain a five-year mean summer phosphorus concentration below 37 μg/L ± 4%.
  • Maintain a mean summer secchi depth no less than 5 ft.

Long Range Goals - Year 2040

  • Maintain a water quality rating of B.
  • Achieve a five-year mean summer phosphorus concentration at or below 30 μg/L ± 4%.
  • Maintain a mean summer secchi depth no less than 7 ft.

 

 

 

Forest Lake

Forest Lake is the largest lake in Washington County with a surface area of 2,220 acres and a maximum depth of 37 feet. Over 8,160 acres of land and water drain into Forest Lake including Clear Lake, Twin Lake, Elwell Lake and Cranberry Lake. Due to its shape, Forest Lake can be identified as having three basins: west (Lake 1), center (Lake 2) and east (Lake 3). It is highly used for recreation and has three sites for public access. Forest Lake accepts stormwater discharge through a large number of storm sewer outfalls around the lake. The lake is on the State's Impaired Waters List with impairments to consumption as a result of mercury and PCBs in fish tissue. The water quality of Forest Lake is fair with lake grades of "B-" and "C" depending on the basin. In recent studies, Forest Lake was identified as having the healthiest fish community of all lakes in the District with relatively low abundance of rough fish and a healthy presence of top predator and panfish groups. The lake has a diverse plant community with desirable plant species common despite the presence of invasive species such as curly leaf pondweed, Eurasian watermilfoil, and flowering rush.

Forest Lake studies and reports can be found here.