Berkhahn Flowage (Townline)
Marathon County, Wisconsin · WBIC 1415400
Size
1,100 acres
Max depth
12 ft
DNR lake type
Simple, Harsh
A lake type the DNR marks as having harsh conditions for fish. This describes the lake type in general, not this lake in particular.
Outline
Drawn from the DNR's 24K hydrography (surveyed 1970), so the shape is approximate and a landing can sit a little off the shore. Open the DNR lake map.
Water clarity (satellite estimate)
- Summer 20166 ft (53 satellite pixels)
No one has measured this lake's clarity in the monitoring data. This is an estimate from satellite images of one summer only, so it may not match the lake today.
Secchi depth is how far down a white disk stays visible. A bigger number means clearer water. The estimate tops out at 16 feet.
Landsat satellite estimates published by the Wisconsin DNR (summers 2016 and 2017), averaged over the lake's outline. Informational use only.
Water temperature
A typical year Modeled estimate
- Ice goes outabout Apr 12 (Apr 3 to Apr 23)
- Surface reaches 48°Fabout Apr 20 (Apr 15 to Apr 27)
- Surface reaches 64°Fabout May 22 (May 14 to May 26)
- June surface72°F, usually 71 to 74°F
- July surface78°F, usually 77 to 79°F
- August surface74°F, usually 72 to 76°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 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 Marathon County
- Teal Flowage2.4 miles away
- Big Eau Pleine Reservoir3.6 miles away
- Smoky Hill Flowage3.6 miles away
- South Rice Lake4.7 miles away
- North Rice Lake4.7 miles away
- Lake Du Bay6.9 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
- 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
- Satellite clarity estimateLandsat summer clarity estimates published by the Wisconsin DNR (2016, 2017), 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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