Blass Lake
Sauk County, Wisconsin · WBIC 1295800
Size
34 acres
Max depth
16 ft
DNR lake type
Complex, Riverine
Water clarity
4.5 ft
Low, measured Aug 2009
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
4.5 ft Secchi depthLowOlder reading
Last measured Aug 4, 2009. 2 readings on record, 2007 to 2009.
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 BLASS LAKE - DEEP HOLE. Checked Oct 23, 2026.
Water temperature
A typical year Modeled estimate
- Ice goes outabout Apr 7 (Mar 31 to Apr 14)
- Surface reaches 48°Fabout Apr 18 (Apr 10 to Apr 23)
- Surface reaches 64°Fabout May 2 (Apr 19 to May 9)
- June surface77°F, usually 76 to 79°F
- July surface83°F, usually 82 to 85°F
- August surface78°F, usually 76 to 80°F
Forms a warm top layer around May 2, lasting about 133 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
- Largemouth Basslast stocked 2019 (yearling); stocked in 1 year 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
- 1Lake Blass AccessCarry-in access · Unimproved surface · Village
Directions
Wisconsin DNR public boat access sites. Checked Oct 23, 2026.
More lakes in Sauk County
- Delton Lake1.4 miles away
- Mirror Lake1.7 miles away
- Lake of the Dells1.8 miles away
- Virginia Lake7.6 miles away
- Seeley Lake12 miles away
- Devils Lake13 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
- 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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