Ucil Lake
Oconto County, Wisconsin · WBIC 455400
The DNR lists this lake's watershed (Peshtigo Brook) 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
54 acres
Max depth
13 ft
DNR lake type
Simple, Warm, clear water color
Water clarity
13 ft
Clear, measured Sep 2019
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 1991), so the shape is approximate and a landing can sit a little off the shore. Open the DNR lake map.
Water clarity
13 ft Secchi depthClearOlder reading
Last measured Sep 23, 2019. 19 readings on record, 1987 to 2019.
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 UCIL LAKE - DEEPEST PART. Checked Oct 23, 2026.
Water temperature
A typical year Modeled estimate
- Ice goes outabout Apr 5 (Mar 30 to Apr 13)
- Surface reaches 48°Fabout Apr 19 (Apr 11 to Apr 26)
- Surface reaches 64°Fabout May 13 (May 8 to May 23)
- June surface73°F, usually 72 to 75°F
- July surface79°F, usually 78 to 79°F
- August surface74°F, usually 73 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.
Boat landings
- 1Ucil Lake AccessBoat ramp · Gravel surface · Township
Directions - 2Wescott Lake AccessBoat ramp · Gravel surface · Township
Directions
Wisconsin DNR public boat access sites. Checked Oct 23, 2026.
More lakes in Oconto County
- Wescott Lake0.5 miles away
- Messenger Lake0.7 miles away
- Marl Lake1.0 miles away
- Funk Lake1.0 miles away
- Spies Lake1.1 miles away
- Deer Lake1.8 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
- 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
- VHS statusWisconsin DNR VHS status by watershed, 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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