Lake Kegonsa is the lowest lake in the Yahara chain and is surrounded primarily by agricultural land. Like Waubesa, Lake Kegonsa is one of the shallower lakes in the Yahara chain. Lake Kegonsa State Park, which contains prairie, forest and marsh habitats, is located along its northeastern shore. Most of the phosphorus entering the lake on an annual basis comes from upstream sources, although summer phosphorus levels may be driven by runoff within the watershed (McDonald & Lathrop, 2016).
Reductions to the phosphorus load entering Lake Kegonsa will come from work in the watersheds of the upper lakes and from improvements to agricultural cropping practices in the Lake Kegonsa watershed. Some improvements will also come from improving control of construction erosion in urban areas.
Lake Kegonsa by the numbers
- Watershed area: 34,560 acres
- Surface area: 3,210 acres
- Shoreline: 10 miles
- Maximum depth: 31 feet
- Mean depth: 17 feet
- Flushing rate: 4 months
- 3.4 feet or “good” according to Department of Natural Resources criteria for shallow lakes (2017)
Lake Kegonsa State Park beach is the only public beach on the lake and is not routinely monitored for blue-green algae.
- 0.128 mg/L or “poor” according to Department of Natural Resources criteria for shallow lakes (2017)
For an update on phosphorus reduction projects, see the State of the Lakes Annual Report.
Organizations supporting Lake Kegonsa
The following groups work on water quality issues in the Lake Kegonsa watershed. Consider contacting an organization near you to get involved!