Cast Gill

Upper Saint Croix Lake

Douglas County, Wisconsin · WBIC 2747300

Official regulationsDNR lake mapDepth map (PDF)

This lake has fishing rules that differ from the standard ones for its area. Check the official rules before you fish. Official regulations

Size

855 acres

Max depth

22 ft

DNR lake type

Complex, Cool, dark water color

Water clarity

9 ft

Moderate, measured Aug 2017

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

Upper Saint Croix Lake - North Access1Upper Saint Croix Lake Access2Upper Saint Croix Lake Access3Upper Saint Croix Lake - South Access4Lucius Woods County Park Access Site5

Numbered dots are boat landings; tap one for directions. The list below has the same numbers. Drawn from the DNR's 24K hydrography (surveyed 1981), so the shape is approximate and a landing can sit a little off the shore. Open the DNR lake map.

Water clarity

9 ft Secchi depthModerateOlder reading

Last measured Aug 29, 2017. 113 readings on record, 1995 to 2017.

Typical summer clarity (June to September): 6.5 ft, moderate, from 17 readings (2012 to 2017).

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 Upper Saint Croix Lake - South Site. Checked Oct 23, 2026.

Water temperature

A typical year Modeled estimate

  • Ice goes outabout Apr 19 (Apr 13 to Apr 25)
  • Surface reaches 48°Fabout May 1 (Apr 21 to May 7)
  • Surface reaches 64°Fabout May 29 (May 24 to Jun 5)
  • June surface71°F, usually 69 to 72°F
  • July surface76°F, usually 75 to 78°F
  • August surface73°F, usually 72 to 75°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

Loading today's forecast…

Forecast: National Weather Service (no endorsement implied). Sunrise, sunset and moon phase are calculated. The moon phase can be a day off.

Stocking history

  • Walleyelast stocked 2025 (large fingerling and small fingerling); stocked in 9 years since 2010
  • Lake Sturgeonlast stocked 2017 (large fingerling); stocked in 6 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

Some landings are matched to this lake by name only, because the DNR list gives no location for them. They have no pin.

Wisconsin DNR public boat access sites. Checked Oct 23, 2026.

More lakes in Douglas County

All Douglas County lakes

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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