First Lake
Trempealeau County, Wisconsin · WBIC 728900
The DNR lists this lake's watershed (Halfway Creek-Mississippi River) as suspect or infected with VHS, a fish virus. The listing covers the watershed, not a test of this lake. About VHS
Size
17 acres
Max depth
3 ft
DNR lake type
Simple, Warm, dark water color
Water clarity
3 ft
Low, measured Aug 2001
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
Drawn from the DNR's 24K hydrography (surveyed 1992), so the shape is approximate and a landing can sit a little off the shore. Open the DNR lake map.
Water clarity
3 ft Secchi depthLowOlder reading
Last measured Aug 8, 2001. 2 readings on record, 2000 to 2001.
Only a few readings are on record.
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 FIRST LAKE - FIRST LAKE. Checked Oct 23, 2026.
Water temperature
A typical year Modeled estimate
- Ice goes outabout Apr 6 (Mar 30 to Apr 18)
- Surface reaches 48°Fabout Apr 12 (Apr 6 to Apr 22)
- Surface reaches 64°Fabout Apr 22 (Apr 17 to Apr 26)
- June surface82°F, usually 80 to 83°F
- July surface87°F, usually 85 to 89°F
- August surface80°F, usually 77 to 82°F
Forms a warm top layer around May 16, lasting about 113 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.
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 Trempealeau County
- Second Lake0.3 miles away
- Third Lake0.8 miles away
- Marinuka Lake7.0 miles away
- Henry Lake23 miles away
- Bugle Lake25 miles away
- Strum Lake (Crystal)38 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
- 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
- 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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