Saint Croix Flowage Lake vs Whitefish Lake
Water quality, depth, fish species, and recreation comparison.
Saint Croix Flowage Lake and Whitefish Lake read the same on nutrients and algae. Both are in Douglas County, Wisconsin.
Saint Croix Flowage Lake and Whitefish Lake are both in Wisconsin — a same-state head-to-head where the comparison comes down to lake-specific differences in depth, watershed, and monitoring history rather than the broader state-level water-quality regime. The readings are close: Saint Croix Flowage Lake and Whitefish Lake sit within a narrow band of each other on phosphorus, chlorophyll-a and clarity. The per-parameter table below shows where the small differences actually live.
With readings this close, the choice between the two lakes turns on non-water-quality factors: depth, fish species, public access, distance from home. The per-lake pages below cover all of those.
Saint Croix Flowage Lake
Good clarity, visible to about 10.5 ft.
Whitefish Lake
Crystal clear, you can see 25 ft down.
Side-by-Side Metrics
| Metric | Saint Croix Flowage Lake | Whitefish Lake |
|---|---|---|
| Water Clarity | 10.5 ft | 25 ft Better |
| Phosphorus | 23.8 µg/L | 11 µg/L Better |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | - | 102 ft |
| Surface Area | 1,913 acres | 848 acres |
| Public Access | Yes | Yes |
| Fish Species | 0 | 5 Better |
| Trophic State | mesotrophic | oligotrophic |
A green ✓ marks the better value for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better). Surface area and trophic state carry no tick — a bigger lake is not a better lake.
Swap a lake
Compare Saint Croix Flowage Lake or Whitefish Lake against a different lake.
Verdict
Both lakes earn the same Grade B. The tiebreakers come down to clarity (Saint Croix Flowage Lake: 10.5 ft, Whitefish Lake: 25 ft) and what you want from the lake. Saint Croix Flowage Lake has fewer fish species than Whitefish Lake.
Source: EPA National Aquatic Resource Surveys, 2026.