Fountain Lake
Portage County, Wisconsin · WBIC 262200
The DNR lists this lake's watershed (Waupaca River) as suspect or infected with VHS, a fish virus. The listing covers the watershed, not a test of this lake. About VHS
This lake has fishing rules that differ from the standard ones for its area. Check the official rules before you fish. Official regulations
Size
15 acres
Max depth
23 ft
DNR lake type
Simple, Cool, clear water color
Water clarity
23 ft
Clear, measured Sep 2026
A cool-water lake type: the DNR groups it with lakes that stay cooler 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 1969), so the shape is approximate and a landing can sit a little off the shore. Open the DNR lake map.
Water clarity
23 ft Secchi depthClear
Last measured Sep 17, 2026. 52 readings on record, 2011 to 2026.
Typical summer clarity (June to September): 14.5 ft, clear, from 29 readings (2013 to 2026).
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 Fountain Lake - Deep Hole. Checked Oct 23, 2026.
Water temperature
64.9°F surface, measured Sep 17, 2026
Measured near the surface (0.3 m down). A single reading, not a daily value.
A typical year Modeled estimate
- Ice goes outabout Apr 13 (Apr 6 to Apr 17)
- Surface reaches 48°Fabout Apr 19 (Apr 14 to Apr 26)
- Surface reaches 64°Fabout May 12 (May 8 to May 24)
- June surface72°F, usually 71 to 74°F
- July surface78°F, usually 76 to 79°F
- August surface74°F, usually 72 to 76°F
Forms a warm top layer around Apr 27, lasting about 131 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.
Boat landings
- 1Fountain LakeBoat ramp · Paved surface · State(dnr)
Directions
Wisconsin DNR public boat access sites. Checked Oct 23, 2026.
More lakes in Portage County
- Deans Lake1.7 miles away
- Pickerel Lake2.9 miles away
- Pine Lake3.1 miles away
- Jim Lake3.3 miles away
- Pleasant Lake3.4 miles away
- Wolf Lake4.3 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
- 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
- Measured temperatureWisconsin 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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