District Waterbodies

Forest Lake

Comfort Lake

Little Comfort Lake

Bone Lake

Moody Lake

Birch Lake

School Lake

Sylvan Lake

Shields Lake

 

Sylvan Lake Quick Facts

Lake Size: 67 acres
Watershed Drainage Area: 303 acres; land use is mix of semi-urban and rural/agricultural
Maximum Depth: 40.5 feet
Outlet Elevation: NA - landlocked
Ordinary High Water Level: 937.1 feet
Low Water Level: 934.52 feet (1990)
High Water Level: 938 feet (2003)
Impairments: None
Invasive Species (2016): Purple loosestrife, curly-leaf pondweed

Water Quality (2016)

Eutrophic, Lake Grade: A
Summer average total phosphorus: 18 ug/L
Summer average Secchi disc: 4.18 meters
Summer chlorophyll-a: 4.1 ug/L

Resource Goals
Short Term Goals - Year 2020

  • Maintain a water quality rating of A.
  • Maintain a five-year mean summer phosphorus concentration at or below 20 μg/L ± 4%.
  • Maintain a mean summer secchi depth no less than 10 ft.

Long Range Goals - Year 2030

  • Maintain a water quality rating of A.
  • Maintain a five-year mean summer phosphorus concentration at or below 20 μg/L ± 4%.
  • Maintain a mean summer secchi depth no less than 10 ft.

Long Range Goals - Year 2040

  • Maintain a water quality rating of A.
  • Maintain a five-year mean summer phosphorus concentration at or below 20 μg/L ± 4%.
  • Maintain a mean summer secchi depth no less than 10 ft.

 

 

Sylvan Lake

Sylvan Lake (formerly Halfbreed Lake) is a deep lake with excellent water quality. The lake does not drain (it's landlocked) and it has rich fen floating mats south of the lake that have been identified for preservation in past studies (CLFLWD, 2007). Sylvan Lake is known for its excellent water quality.

The lake likely maintains its high quality through relatively low pollutant concentrations entering from its drainage area and a high rate of exchange with groundwater. A 2007 study found that panfish are abundant but top predators account for the majority of the biomass. The rough fish population was considered stable as carp were not collected in survey. The plant community was very diverse with curly-leaf pondweed present but not out competing native species. The overall management for the lake and watershed is focused on protection activities.

Sylvan Lake studies and reports can be found here.