Seven Island Lake
Lincoln County, Wisconsin · WBIC 1490300
Size
138 acres
Max depth
31 ft
DNR lake type
Complex, Cool, clear water color
Water clarity
13 ft
Clear, measured Aug 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
Numbered dots are boat landings; tap one for directions. The list below has the same numbers. Drawn from the DNR's 24K hydrography (surveyed 1981), so the shape is approximate and a landing can sit a little off the shore. Open the DNR lake map.
Water clarity
13 ft Secchi depthClear
Last measured Aug 30, 2026. 206 readings on record, 1992 to 2026.
Typical summer clarity (June to September): 14 ft, clear, from 47 readings (2020 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 Seven Island Lake - Deep Hole. Checked Oct 23, 2026.
Water temperature
72.9°F surface, measured Aug 30, 2026
Measured near the surface (0 m down). A single reading, not a daily value.
A typical year Modeled estimate
- Ice goes outabout Apr 24 (Apr 16 to May 2)
- Surface reaches 48°Fabout May 4 (Apr 24 to May 9)
- Surface reaches 64°Fabout May 30 (May 27 to Jun 6)
- June surface68°F, usually 67 to 70°F
- July surface74°F, usually 73 to 75°F
- August surface72°F, usually 70 to 73°F
Forms a warm top layer around May 17, lasting about 94 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 2013 (large fingerling and small fingerling); stocked in 2 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
- 1Seven Island Lake AccessBoat ramp · Gravel surface · Township
Directions - 2Long Lake AccessBoat ramp · Concrete Plank surface · Local
Directions
Wisconsin DNR public boat access sites. Checked Oct 23, 2026.
More lakes in Lincoln County
- Long Lake0.5 miles away
- Bog Lake0.6 miles away
- Snake Lake0.7 miles away
- Fox Lake0.7 miles away
- Stewart Lake0.7 miles away
- Dudley Lake0.8 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
- 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
- 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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