Saint Croix Flowage Lake
Saint Croix Flowage Lake in Douglas County, Wisconsin has a water quality grade of B (Good). Water clarity: 10.5 ft visibility. Phosphorus: 23.8 µg/L. Surface area: 1913 acres.
- Clarity
- 10.5 ft
- Area
- 1,913 acres
- Type
- Mesotrophic
- Public access
- Yes
Next lake in Douglas County
Swipe left or right on this bar to open the next or previous lake.
Saint Croix Flowage Lake is a 1,913-acre mesotrophic lake in Douglas County, Wisconsin. Water quality is graded B based on 1 sampling years through 2020. 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. Grade methodology: LakeQuality methodology.
Watch Saint Croix Flowage Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
Good clarity, visible to about 10.5 ft. Phosphorus level: 23.8 µg/L. Trophic State Index: 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.5 ft | Not graded |
| Phosphorus | 23.8 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay 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.
Top-rated places to stay near Saint Croix Flowage Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 1,913 acres |
| Public Access | Yes |
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
- Gordon Flowage1.6 km
- Gordon Flowage1.6 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
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
EPA Impairment Status
Saint Croix Flowage Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit WI10005472 · Official waterbody report · Matched by proximity (2.94 km)
County Ranking
Ranked #2 of 15 lakes in Douglas County
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. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Saint Croix Flowage Lake?
- Saint Croix Flowage Lake in Douglas County, Wisconsin has a water quality grade of B (Good). Water clarity: 10.5 ft visibility. Phosphorus: 23.8 µg/L. Surface area: 1913 acres.
Is Saint Croix Flowage Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Saint Croix Flowage Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
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.
Are there campgrounds on Saint Croix Flowage Lake?
- Saint Croix Flowage Lake has 4 public campgrounds from USGS The National Map within 5 km, including Gordon Flowage, Gordan Dam, Gordon Flowage, Gordon Flowage. 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
Fish species and top-graded lakes across Wisconsin
Fish species and best lakes in Douglas County
Species activity outlook by water temperature and season
Where to stay at Wisconsin's top lakes, each with its grade
Lakes in the St. Croix Watershed, ranked by water quality
Lakes in the Lake Superior Basin (MN+WI), ranked by water quality
Moderate nutrients, good water quality
Wisconsin's cleanest and most-polluted lakes, ranked
More Wisconsin Lake Rankings
State Parks Near Saint Croix Flowage Lake
Other Grade B Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
Compare Saint Croix Flowage Lake With Nearby Lakes
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)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory
Public campgrounds from USGS The National Map Structures, within about 3 miles