Ashippun Lake
Waukesha County, Wisconsin · WBIC 854300
Size
84 acres
Max depth
40 ft
DNR lake type
Complex, Warm, clear water color
Water clarity
10 ft
Clear, measured Aug 2025
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 1976), 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 depthClear
Last measured Aug 26, 2025. 313 readings on record, 1981 to 2025.
Typical summer clarity (June to September): 10 ft, clear, from 38 readings (2012 to 2025).
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 ASHIPPUN LAKE - DEEP HOLE. Checked Oct 23, 2026.
Water temperature
Last measured Aug 26, 2025, too long ago to show as the current temperature.
A typical year Modeled estimate
- Ice goes outabout Apr 10 (Mar 30 to Apr 13)
- Surface reaches 48°Fabout Apr 21 (Apr 12 to Apr 28)
- Surface reaches 64°Fabout May 11 (May 5 to May 20)
- June surface75°F, usually 74 to 76°F
- July surface81°F, usually 79 to 82°F
- August surface76°F, usually 74 to 79°F
Forms a warm top layer around Apr 22, lasting about 182 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
- Northern Pikelast stocked 2021 (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.
Fish recorded near this lake
- Black Crappie Pomoxis nigromaculatus1962 to 2002; 8 records
- Bluegill Lepomis macrochirus1962 to 2003; 14 records
- Bluntnose Minnow Pimephales notatus2002; 2 records
- Bowfin Amia calva1973 to 2003; 4 records
- Brook Silverside Labidesthes sicculus2002; 1 record
- Brown Bullhead Ameiurus nebulosus1978; 1 record
- Common Carp Cyprinus carpio1973 to 2003; 5 records
- Golden Shiner Notemigonus crysoleucas1978; 1 record
- Green Sunfish Lepomis cyanellus1973 to 2002; 2 records
- Largemouth Bass Micropterus salmoides1962 to 2003; 14 records
- Northern Pike Esox lucius1971 to 2003; 11 records
- Pumpkinseed Lepomis gibbosus1962 to 2002; 5 records
- Redfin Pickerel Esox americanus1978 to 1988; 4 records
- Rock Bass Ambloplites rupestris1969 to 2002; 4 records
- Walleye Sander vitreus1973 to 2003; 6 records
- Warmouth Lepomis gulosus1962 to 2003; 11 records
- White Crappie Pomoxis annularis2003; 2 records
- White Perch Morone americana1988; 1 record
- White Sucker Catostomus commersonii1973 to 2003; 6 records
- Yellow Bullhead Ameiurus natalis1962 to 2003; 8 records
- Yellow Perch Perca flavescens1978 to 2003; 6 records
Recorded in open fish survey and museum records (GBIF). A record shows a fish was found near this lake in that year, not that it is there now, and says nothing about how many. Most coordinates are rounded to about 1 km, so a record is attached only when one lake is the clear match.
Open fish survey and museum records from GBIF; datasets are listed on the sources page. Checked Oct 23, 2026.
Boat landings
- 1Ashippun Lake Boat RampBoat ramp · Concrete Panels surface · Accessible features · State(dnr)
Directions
Wisconsin DNR public boat access sites. Checked Oct 23, 2026.
More lakes in Waukesha County
- Tamarack Lake1.8 miles away
- Lac La Belle3.1 miles away
- Fowler Lake3.2 miles away
- Okauchee Lake3.3 miles away
- Oconomowoc Lake, Upper3.3 miles away
- Florence Lake3.8 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
- Typical-year temperatureU.S. Geological Survey lake temperature model (modeled estimate), checked Oct 23, 2026
- Fish recordedOpen fish survey and museum records, via GBIF, 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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