St Croix Flowage
Douglas County, Wisconsin · WBIC 2740300
The DNR has advice about eating fish from this water. How much is safe depends on the fish and on who is eating it. Look it up on the DNR site
Size
1,913 acres
Max depth
28 ft
DNR lake type
Complex, Riverine
Water clarity
10 ft
Clear, measured Sep 2020
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 1982), so the shape is approximate and a landing can sit a little off the shore. Open the DNR lake map.
Water clarity
10 ft Secchi depthClearOlder reading
Last measured Sep 14, 2020. 115 readings on record, 1993 to 2020.
Typical summer clarity (June to September): 8 ft, moderate, from 32 readings (2012 to 2020).
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 St Croix Flowage - Near Dam Deep Hole Site A. Checked Oct 23, 2026.
Water temperature
A typical year Modeled estimate
- Ice goes outabout Apr 20 (Apr 14 to Apr 26)
- Surface reaches 48°Fabout May 2 (Apr 23 to May 8)
- Surface reaches 64°Fabout May 29 (May 27 to Jun 6)
- June surface70°F, usually 68 to 71°F
- July surface76°F, usually 75 to 78°F
- August surface74°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
Forecast: National Weather Service (no endorsement implied). Sunrise, sunset and moon phase are calculated. The moon phase can be a day off.
Stocking history
- Muskellungelast stocked 2018 (large fingerling); stocked in 5 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.
Fish recorded near this lake
- Black Bullhead Ameiurus melas1969; 3 records
- Black Crappie Pomoxis nigromaculatus1947 to 2003; 9 records
- Bluegill Lepomis macrochirus1947 to 2003; 9 records
- Bowfin Amia calva1947 to 2003; 5 records
- Brook Silverside Labidesthes sicculus2003; 2 records
- Brown Bullhead Ameiurus nebulosus2003; 1 record
- Central Mudminnow Umbra limi2003; 2 records
- Common Carp Cyprinus carpio1969 to 2003; 3 records
- Common Shiner Luxilus cornutus2003; 1 record
- Golden Shiner Notemigonus crysoleucas1969 to 2003; 4 records
- Largemouth Bass Micropterus salmoides1947 to 2003; 9 records
- Northern Pike Esox lucius1947 to 2003; 9 records
- Pumpkinseed Lepomis gibbosus1960 to 2003; 9 records
- Rock Bass Ambloplites rupestris1969 to 2003; 6 records
- Smallmouth Bass Micropterus dolomieu1969 to 2003; 3 records
- Walleye Sander vitreus1947 to 1969; 2 records
- White Sucker Catostomus commersonii1947 to 1969; 2 records
- Yellow Perch Perca flavescens1947 to 2003; 7 records
Recorded in open fish survey and museum records (GBIF). A record shows a fish was found near this lake in that year, not that it is there now, and says nothing about how many. Most coordinates are rounded to about 1 km, so a record is attached only when one lake is the clear match.
Open fish survey and museum records from GBIF; datasets are listed on the sources page. Checked Oct 23, 2026.
Boat landings
- 1North Flowage Boat LandingBoat ramp · Concrete Panels surface · County
Directions - 2Gordon Dam Park Boat LandingBoat ramp · Concrete surface · County
Directions
Wisconsin DNR public boat access sites. Checked Oct 23, 2026.
More lakes in Douglas County
- Webb Lake1.6 miles away
- Spider Lake2.1 miles away
- Rainbow Lake2.5 miles away
- Beglinger Lake2.6 miles away
- Whitefish Lake2.7 miles away
- Bass Lake2.8 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
- Stocking historyWisconsin DNR annual fish stocking summary, 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
- Fish recordedOpen fish survey and museum records, via GBIF, checked Oct 23, 2026
- Fish consumption advice flagWisconsin DNR advisory areas (flag and link only), checked Oct 24, 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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