Big Muskego Lake
Waukesha County, Wisconsin · WBIC 762400
This lake has fishing rules that differ from the standard ones for its area. Check the official rules before you fish. Official regulations
Size
2,260 acres
Max depth
4 ft
DNR lake type
Complex, Warm, dark water color
Water clarity
10 ft
Clear, measured Aug 2003
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
Numbered dots are boat landings; tap one for directions. The list below has the same numbers. 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
10 ft Secchi depthClearOlder reading
Last measured Aug 14, 2003. 168 readings on record, 1991 to 2003.
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 - DEEP HOLE. Checked Oct 23, 2026.
Water temperature
A typical year Modeled estimate
- Ice goes outabout Apr 8 (Mar 29 to Apr 16)
- Surface reaches 48°Fabout Apr 16 (Apr 3 to Apr 18)
- Surface reaches 64°Fabout May 6 (May 3 to May 18)
- June surface73°F, usually 71 to 74°F
- July surface77°F, usually 75 to 80°F
- August surface76°F, usually 73 to 78°F
Mixes regularly through the summer instead of forming a warm top layer.
A computer model of this lake's typical weather and water, built from 6 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.
Stocking history
- Northern Pikelast stocked 2019 (large fingerling); stocked in 10 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
- 1Big Muskego & Bass Bay - Boxhorn LaunchBoat ramp · Concrete surface · Accessible features · City
Directions - 2Big Muskego Lake - Durham Drive AccessBoat ramp · Concrete surface · City
Directions
Wisconsin DNR public boat access sites. Checked Oct 23, 2026.
Water level and flow
U.S. Geological Survey gauges at or beside this lake. Readings are provisional and fetched when you open the page.
More lakes in Waukesha County
- Bass Bay Lake1.5 miles away
- Little Muskego Lake3.1 miles away
- Lake Denoon3.6 miles away
- Lower Kelly Lake4.7 miles away
- Big Bend Pond4.8 miles away
- Upper Kelly Lake5.0 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
- Typical-year temperatureU.S. Geological Survey lake temperature model (modeled estimate), checked Oct 23, 2026
- Water level and flowU.S. Geological Survey gauges (readings are live), 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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