Bass Bay Lake
Waukesha County, Wisconsin · WBIC 763200
This lake has fishing rules that differ from the standard ones for its area. Check the official rules before you fish. Official regulations
Size
100 acres
Max depth
23 ft
DNR lake type
Complex, Warm, dark water color
Water clarity
3.3 ft
Low, measured Aug 2001
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
Drawn from the DNR's 24K hydrography (surveyed 1993), so the shape is approximate and a landing can sit a little off the shore. Open the DNR lake map.
Water clarity
3.3 ft Secchi depthLowOlder reading
Last measured Aug 29, 2001. 67 readings on record, 1988 to 2001.
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 Big Muskego Lake (Bass Bay Lake) - Near Muskego WI. Checked Oct 23, 2026.
Water temperature
A typical year Modeled estimate
- Ice goes outabout Mar 31 (Mar 27 to Apr 10)
- Surface reaches 48°Fabout Apr 12 (Apr 4 to Apr 23)
- Surface reaches 64°Fabout May 16 (May 10 to May 23)
- June surface76°F, usually 75 to 77°F
- July surface83°F, usually 80 to 85°F
- August surface79°F, usually 77 to 81°F
Forms a warm top layer around Jun 5, lasting about 48 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 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
- Big Muskego Lake1.5 miles away
- Little Muskego Lake1.8 miles away
- Lower Kelly Lake3.6 miles away
- Upper Kelly Lake3.9 miles away
- Lake Denoon4.4 miles away
- Big Bend Pond4.7 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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