Hemlock Slough
Sauk County, Wisconsin · WBIC 1286100
Size
12 acres
Max depth
12 ft
DNR lake type
Simple, Riverine
Water clarity
6.6 ft
Moderate, measured Sep 2014
A river-like water type, with flow instead of a still basin. 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 1975), so the shape is approximate and a landing can sit a little off the shore. Open the DNR lake map.
Water clarity
6.6 ft Secchi depthModerateOlder reading
Last measured Sep 12, 2014. 2 readings on record, 2014.
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 Hemlock Slough - South End. Checked Oct 23, 2026.
Water temperature
A typical year Modeled estimate
- Ice goes outabout Apr 6 (Mar 30 to Apr 15)
- Surface reaches 48°Fabout Apr 19 (Apr 12 to Apr 25)
- Surface reaches 64°Fabout May 9 (May 2 to May 11)
- June surface74°F, usually 73 to 76°F
- July surface81°F, usually 79 to 81°F
- August surface77°F, usually 74 to 78°F
Forms a warm top layer around Apr 16, lasting about 189 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.
Stocking history
- Northern Pikelast stocked 2012 (large fingerling and small fingerling); stocked in 2 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.
Boat landings
- 1Hemlock Slough Sauk County ParkBoat ramp · Concrete surface · County
Directions
Wisconsin DNR public boat access sites. Checked Oct 23, 2026.
More lakes in Sauk County
- Dutch Hollow Lake2.3 miles away
- Redstone Lake3.1 miles away
- Virginia Lake12 miles away
- White Mound Lake16 miles away
- Mirror Lake16 miles away
- Blass Lake17 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
- 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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