Saint Croix Flowage
Douglas County, Wisconsin2,248 acresView mapDirections
No nutrient or algae sampling on record from Wisconsin DNR for this lake.
- Impaired · Mercury
- 28 ft max depth
Saint Croix Flowage in Douglas County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Maximum depth: 28 ft. Surface area: 2248 acres.
Saint Croix Flowage is a 2,248-acre lake in Douglas County, Wisconsin with a maximum depth of 28 feet (7-foot average).
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water. Methodology: how these readings are compared.
What Saint Croix Flowage is good for
From access and monitoring records, not editorial picks.
- Big water2,248 acres
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Saint Croix Flowage is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Whether Saint Croix Flowage is safe to swim in today is a call for the Wisconsin Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Saint Croix Flowage
These are the measurements Wisconsin DNR publishes for Saint Croix Flowage, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. TSI undefined.
Ask about Saint Croix Flowage
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
28 ft
Average depth
7 ft
Surface area
2,248 acres
Shoreline
26.1 mi
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Stays near Saint Croix Flowage
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Fishing Saint Croix Flowage
EPA Impairment Status
Saint Croix Flowage is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Fish consumption.
Source: EPA ATTAINS assessment unit WI10005472 · Official waterbody report
Nearby Lakes in Douglas County
Frequently asked questions about Saint Croix Flowage
Where is Saint Croix Flowage?
- Saint Croix Flowage is a lake in Douglas County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Saint Croix Flowage?
- Saint Croix Flowage in Douglas County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Maximum depth: 28 ft. Surface area: 2248 acres.
Is Saint Croix Flowage safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Saint Croix Flowage is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
How deep is Saint Croix Flowage?
- Saint Croix Flowage has a maximum depth of 28 feet and an average depth of 7 feet. The lake covers 2248 acres.
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Where this data comes from
Measurements for Saint Croix Flowage come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database