Saint Croix Flowage Lake
Douglas County, Wisconsin1,913 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Saint Croix Flowage Lake. Here is what has been measured.
- Mesotrophic
- Public access
- Limited data
Saint Croix Flowage Lake in Douglas County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 10.5 ft visibility. Phosphorus: 23.8 µg/L. Surface area: 1913 acres.
Saint Croix Flowage Lake is a 1,913-acre mesotrophic lake in Douglas County, Wisconsin. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 14 other monitored lakes in Douglas County, Saint Croix Flowage Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2020-09-14. Methodology: how these readings are compared.
Saint Croix Flowage Lake covers about 1,900 acres in Douglas County. It has one public boat landing. If you are planning to stay, you can search lake houses and cabins around Saint Croix Flowage Lake on Vrbo, or look for a hotel room near the lake on Booking.com or Expedia.
What Saint Croix Flowage Lake is good for
From access and monitoring records, not editorial picks.
- Clear water10.5 ft of visibility
- Boat launch1 documented ramp
- Camping2 public campgrounds nearby
- Big water1,913 acres
Swimming conditions
Readings onlyLimited data
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Saint Croix Flowage Lake 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 Lake
These are the measurements Wisconsin DNR publishes for Saint Croix Flowage Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 10.5 ft. Phosphorus 23.8 µg/L. TSI 47.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 10.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 23.8µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 47 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Saint Croix Flowage Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
1,913 acres
Public access
Yes
Listed by Wisconsin DNR
No bathymetric survey has been published for Saint Croix Flowage Lake, so its depth is not documented here.
Recreation & Access
- Gordon Dam ParkPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Public campgrounds near Saint Croix Flowage Lake
- Gordon Flowage1.3 km
- Gordan Dam1.4 km
Nearest public campgrounds in the USGS National Map inventory, within about 3 miles. An empty list means USGS records no campground that close, which is not the same as camping being unavailable. Where the source gives an official reservation link, it is used; the cabin and hotel search does not cover campsites. More camping lakes
Stays via Stay22
Stays near Saint Croix Flowage Lake
Compare lakeside cabins, hotels, and vacation rentals near Saint Croix Flowage Lake in Douglas County, Wisconsin — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
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Fishing Saint Croix Flowage Lake
Reservoir Info (USACE NID)
Saint Croix Flowage Lake is a man-made reservoir impounded by the Saint Croix (completed 1854), built primarily for recreation on the SAINT CROIX; gravity-type dam, 15 ft tall and 2,940 ft long.
- Surface area
- 1,913 ac
- Normal storage
- 12,000 ac-ft
- Max storage
- 18,000 ac-ft
- Drainage area
- 282 sq mi
- Hazard class
- Low
- Owner
- Douglas County
Source: USACE National Inventory of Dams, NID ID WI00504 · Operator website
Nearby Lakes in Douglas County
Frequently asked questions about Saint Croix Flowage Lake
Where is Saint Croix Flowage Lake?
- Saint Croix Flowage Lake 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 Lake?
- Saint Croix Flowage Lake in Douglas County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 10.5 ft visibility. Phosphorus: 23.8 µg/L. Surface area: 1913 acres.
Is Saint Croix Flowage Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Are there boat ramps on Saint Croix Flowage Lake?
- Saint Croix Flowage Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Gordon Dam Park. Public access is listed as yes.
Can I fish at Saint Croix Flowage Lake?
- Saint Croix Flowage Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Wisconsin's fish and wildlife agency, so check its current regulations before you go.
Are there campgrounds on Saint Croix Flowage Lake?
- Saint Croix Flowage Lake has 2 public campgrounds from USGS The National Map within 5 km, including Gordon Flowage, Gordan Dam. This is a location join, not a booking. Cabins and hotels are listed separately; campsite reservations use the official link when the source provides one.
Explore Saint Croix Flowage Lake across LakeQuality
Depth, room, public access, and the state wake-sport rules
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Where this data comes from
9 measurements from 2 monitoring stations, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX9 samples · 2020
Analytical methods
- Phosphorus by Colorimetry
Monitoring station identifiers (2)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Named boat-access points from the USGS National Boat Ramps inventory
Public campgrounds from USGS The National Map Structures, within about 3 miles