First Black Lake
Iron County, Wisconsin · WBIC 2298500
Size
16 acres
Max depth
19 ft
DNR lake type
Complex, Cool, clear water color
Water clarity
4 ft
Low, measured Sep 2026
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 1973), so the shape is approximate and a landing can sit a little off the shore. Open the DNR lake map.
Water clarity
4 ft Secchi depthLow
Last measured Sep 30, 2026. 129 readings on record, 2005 to 2026.
Typical summer clarity (June to September): 2.5 ft, low, from 106 readings (2016 to 2026).
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 FIRST BLACK LAKE - DEEP HOLE. Checked Oct 23, 2026.
Water temperature
61°F surface, measured Sep 30, 2026
Measured near the surface (0.91 m down). A single reading, not a daily value.
A typical year Modeled estimate
- Ice goes outabout Apr 23 (Apr 16 to Apr 30)
- Surface reaches 48°Fabout Apr 27 (Apr 18 to May 6)
- Surface reaches 64°Fabout May 16 (May 9 to May 23)
- June surface71°F, usually 70 to 73°F
- July surface77°F, usually 75 to 78°F
- August surface73°F, usually 71 to 74°F
Forms a warm top layer around May 7, lasting about 130 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.
More lakes in Iron County
- Second Black Lake0.4 miles away
- Lake of the Falls0.8 miles away
- Third Black Lake0.8 miles away
- Popko Lake1.5 miles away
- Fox Lake1.8 miles away
- Dollar Lake1.9 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
- 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
- Measured temperatureWisconsin 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
See data sources for what each source covers, and about for how the numbers are matched to lakes.
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