Steamboat Bay Lake vs Steamboat Lake
Water quality, depth, fish species, and recreation comparison.
Steamboat Bay Lake and Steamboat Lake both received the same overall water quality grade of A (Excellent). Both are in Cass County, Minnesota.
Both Steamboat Bay Lake and Steamboat Lake sit in Minnesota. A same-state comparison strips out the state-level water-quality regime as a variable: any grade differences here are about the lakes themselves, not the agencies grading them. The grades are close: Steamboat Bay Lake (A) and Steamboat Lake (A) are within one letter of each other on the LakeGrade rubric. The per-parameter sub-grades below will show where the small differences actually live.
With grades 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.
Steamboat Bay Lake
Moderate clarity, visible to about 9.8 ft.
Steamboat Lake
Good clarity, visible to about 12 ft.
Side-by-Side Metrics
| Metric | Steamboat Bay Lake | Steamboat Lake |
|---|---|---|
| Overall Grade | A (Excellent) | A (Excellent) |
| Water Clarity | 9.8 ft | 12 ft |
| Phosphorus | 15 µg/L | 11 µg/L |
| Chlorophyll-a (Algae) | 3 µg/L | 3.4 µg/L |
| Maximum Depth | 150 ft | 93 ft |
| Surface Area | 103,444 acres | 1,756 acres |
| Public Access | Yes | Yes |
| Fish Species | 18 | 15 |
| Trophic State | mesotrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Both lakes earn the same Grade A. The tiebreakers come down to clarity (Steamboat Bay Lake: 9.8 ft, Steamboat Lake: 12 ft) and what you want from the lake. Steamboat Bay Lake supports more documented fish species.
Source: EPA National Aquatic Resource Surveys, 2026.