Cosgrove Lake
Florence County, Wisconsin · WBIC 585100
This lake has fishing rules that differ from the standard ones for its area. Check the official rules before you fish. Official regulations
Size
75 acres
Max depth
26 ft
DNR lake type
Complex, Cool, clear water color
Water clarity
18 ft
Clear, measured Jul 2013
A cool-water lake type: the DNR groups it with lakes that stay cooler through summer. This describes the lake type in general, not this lake in particular.
Outline
Drawn from the DNR's 24K hydrography (surveyed 1962), so the shape is approximate and a landing can sit a little off the shore. Open the DNR lake map.
Water clarity
18 ft Secchi depthClearOlder reading
Last measured Jul 31, 2013. 7 readings on record, 2004 to 2013.
Nothing has been measured in the last 5 years, so this may not match the lake today.
Secchi depth is how far down a white disk stays visible. A bigger number means clearer water. Clear means a Secchi depth of 10 feet or more, moderate 5 to 10 feet, low under 5 feet.
Wisconsin DNR water monitoring (volunteer and staff), via the Water Quality Portal; station COSGROVE LAKE - EAST - DEEP HOLE. Checked Oct 23, 2026.
Water temperature
Last measured Aug 20, 2025, too long ago to show as the current temperature.
A typical year Modeled estimate
- Ice goes outabout Apr 18 (Apr 9 to Apr 25)
- Surface reaches 48°Fabout Apr 29 (Apr 20 to May 3)
- Surface reaches 64°Fabout May 24 (May 13 to May 27)
- June surface70°F, usually 69 to 71°F
- July surface75°F, usually 74 to 77°F
- August surface72°F, usually 71 to 74°F
Forms a warm top layer around May 4, lasting about 123 days.
A computer model of this lake's typical weather and water, built from 15 years, 2005 to 2019. Ranges show the middle half of years. The model was not calibrated against measured temperatures for this lake. It is an estimate, not a measurement.
Measured: Wisconsin DNR via the Water Quality Portal (checked Oct 23, 2026). Modeled: U.S. Geological Survey lake temperature data release (doi:10.5066/P9CA6XP8).
Today at the lake
Forecast: National Weather Service (no endorsement implied). Sunrise, sunset and moon phase are calculated. The moon phase can be a day off.
Stocking history
- Walleyelast stocked 2024 (large fingerling and small fingerling); stocked in 7 years since 2010
Stocking shows what was added to the lake, not what is in it now.
Wisconsin DNR annual fish stocking summary. Checked Oct 23, 2026.
Fish recorded near this lake
- Black Crappie Pomoxis nigromaculatus2005; 1 record
- Bluegill Lepomis macrochirus1960 to 2005; 6 records
- Largemouth Bass Micropterus salmoides1960 to 2005; 7 records
- Northern Pike Esox lucius2004 to 2005; 4 records
- Rock Bass Ambloplites rupestris1960 to 2005; 5 records
- Smallmouth Bass Micropterus dolomieu1960 to 2005; 7 records
- Walleye Sander vitreus1960 to 2005; 5 records
- Yellow Perch Perca flavescens1960 to 2005; 5 records
Recorded in open fish survey and museum records (GBIF). A record shows a fish was found near this lake in that year, not that it is there now, and says nothing about how many. Most coordinates are rounded to about 1 km, so a record is attached only when one lake is the clear match.
Open fish survey and museum records from GBIF; datasets are listed on the sources page. Checked Oct 23, 2026.
More lakes in Florence County
- West Lake1.0 miles away
- Lake Anna1.0 miles away
- Bass Lake, Spread Eagle Chain of Lakes1.3 miles away
- Montgomery Lake1.4 miles away
- Middle Lake1.4 miles away
- North Lake1.5 miles away
Where this comes from
- Size, depth and lake typeWisconsin DNR lake classifications, checked Oct 23, 2026
- OutlineWisconsin DNR 24K hydrography, checked Oct 23, 2026
- Stocking historyWisconsin DNR annual fish stocking summary, checked Oct 23, 2026
- Regulations linkWisconsin DNR fishing regulations (linked, not restated), checked Oct 23, 2026
- Water clarityWisconsin DNR water monitoring, via the Water Quality Portal, checked Oct 23, 2026
- Typical-year temperatureU.S. Geological Survey lake temperature model (modeled estimate), checked Oct 23, 2026
- Fish recordedOpen fish survey and museum records, via GBIF, checked Oct 23, 2026
- VHS statusWisconsin DNR VHS status by watershed, checked Oct 24, 2026
- Depth map linkWisconsin DNR lake maps list, checked Oct 24, 2026
See data sources for what each source covers, and about for how the numbers are matched to lakes.
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