Blackhawk Lake
Iowa County, Wisconsin · WBIC 1239400
The DNR lists this lake's watershed (Otter Creek) as suspect or infected with VHS, a fish virus. The listing covers the watershed, not a test of this lake. About VHS
This lake has fishing rules that differ from the standard ones for its area. Check the official rules before you fish. Official regulations
Size
220 acres
Max depth
40 ft
DNR lake type
Complex, Warm, dark water color
Water clarity
3.6 ft
Low, measured Aug 2026
A warm-water lake type: the DNR groups it with lakes that warm up through summer. This describes the lake type in general, not this lake in particular.
Outline
Numbered dots are boat landings; tap one for directions. The list below has the same numbers. Drawn from the DNR's 24K hydrography (surveyed 1983), so the shape is approximate and a landing can sit a little off the shore. Open the DNR lake map.
Water clarity
3.6 ft Secchi depthLow
Last measured Aug 11, 2026. 170 readings on record, 1997 to 2026.
Typical summer clarity (June to September): 6.5 ft, moderate, from 76 readings (2012 to 2026).
Measured at the monitoring station named “BLACK HAWK LAKE - DEEP HOLE”.
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 BLACK HAWK LAKE - DEEP HOLE. Checked Oct 23, 2026.
Water temperature
Last measured Aug 11, 2026, too long ago to show as the current temperature.
A typical year Modeled estimate
- Ice goes outabout Apr 7 (Mar 30 to Apr 16)
- Surface reaches 48°Fabout Apr 23 (Apr 16 to Apr 30)
- Surface reaches 64°Fabout May 11 (May 6 to May 13)
- June surface76°F, usually 74 to 77°F
- July surface82°F, usually 80 to 82°F
- August surface78°F, usually 76 to 80°F
Forms a warm top layer around Apr 27, lasting about 178 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 2025 (fry and large fingerling); stocked in 13 years since 2010
- Northern Pikelast stocked 2023 (large fingerling, small fingerling and yearling); stocked in 11 years since 2010
- Channel Catfishlast stocked 2015 (large fingerling); stocked in 5 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.
Boat landings
- 1Blackhawk LakeBoat ramp · Paved surface · Accessible features · State(dnr)
Directions
Wisconsin DNR public boat access sites. Checked Oct 23, 2026.
More lakes in Iowa County
- Cox Hollow Lake9.0 miles away
- Twin Valley Lake9.9 miles away
- Halverson Lake10 miles away
- Ludden Lake11 miles away
- Avoca Lake12 miles away
- Kendal Lake13 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
- Boat landingsWisconsin DNR public boat access sites, 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
- 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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