Upper Nashotah Lake
Waukesha County, Wisconsin · WBIC 827500
Size
133 acres
Max depth
53 ft
DNR lake type
Complex, Two Story
Water clarity
5.9 ft
Moderate, measured Jun 1995
A deep lake type that can hold a cold layer below the warm surface in summer. This describes the lake type in general, not this lake in particular.
Outline
Drawn from the DNR's 24K hydrography (surveyed 1976), so the shape is approximate and a landing can sit a little off the shore. Open the DNR lake map.
Water clarity
5.9 ft Secchi depthModerateOlder reading
Last measured Jun 22, 1995. 5 readings on record, 1981 to 1995.
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 Upper Nashotah Lake - Deep Hole. Checked Oct 23, 2026.
Water temperature
A typical year Modeled estimate
- Ice goes outabout Apr 10 (Mar 31 to Apr 15)
- Surface reaches 48°Fabout Apr 21 (Apr 13 to Apr 29)
- Surface reaches 64°Fabout May 13 (May 8 to May 22)
- June surface74°F, usually 73 to 76°F
- July surface81°F, usually 79 to 82°F
- August surface77°F, usually 74 to 79°F
Forms a warm top layer around Apr 20, lasting about 191 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 Waukesha County
- Lower Nashotah Lake0.7 miles away
- Upper Nemahbin Lake1.3 miles away
- Oconomowoc Lake1.5 miles away
- Florence Lake1.7 miles away
- Applebecker Millpond1.8 miles away
- Forest Lake1.8 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
- 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.
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