Grassy Knoll Lake
Taylor County, Wisconsin · WBIC 1764400
Size
58 acres
Max depth
6 ft
DNR lake type
Simple, Cool, clear water color
Water clarity
9.1 ft
Moderate, measured Aug 2001
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 1990), so the shape is approximate and a landing can sit a little off the shore. Open the DNR lake map.
Water clarity
9.1 ft Secchi depthModerateOlder reading
Last measured Aug 8, 2001. 2 readings on record, 2000 to 2001.
Only a few readings are on record.
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 GRASSY KNOLL LAKE - GRASSY KNOLL LAKE. Checked Oct 23, 2026.
Water temperature
A typical year Modeled estimate
- Ice goes outabout Apr 17 (Apr 10 to Apr 26)
- Surface reaches 48°Fabout Apr 21 (Apr 18 to May 6)
- Surface reaches 64°Fabout May 20 (May 10 to May 26)
- June surface70°F, usually 69 to 72°F
- July surface75°F, usually 74 to 76°F
- August surface72°F, usually 70 to 74°F
Forms a warm top layer around May 23, lasting about 72 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.
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 Taylor County
- Sackett Lake0.9 miles away
- Pechstein Lake1.0 miles away
- Clear Lake1.9 miles away
- Perch Lake2.0 miles away
- Esadore Lake2.0 miles away
- Schoolhouse Lake2.1 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
- 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.
Something wrong on this page? Report a problem.