Thunder Lake vs Upper Trelipe Lake
Water quality, depth, fish species, and recreation comparison.
Thunder Lake has a higher water quality grade (A, Excellent) than Upper Trelipe Lake (A, Excellent). Both are in Cass County, Minnesota.
A
Thunder Lake
Cass County, Minnesota
Crystal clear, you can see 20 ft down.
A
Upper Trelipe Lake
Cass County, Minnesota
Good clarity, visible to about 14 ft.
Side-by-Side Metrics
| Metric | Thunder Lake | Upper Trelipe Lake |
|---|---|---|
| Overall Grade | A (Excellent) | A (Excellent) |
| Water Clarity | 20 ft | 14 ft |
| Phosphorus | No data | 11 µg/L |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 95 ft | 69 ft |
| Surface Area | 1.3K acres | 421.42 acres |
| Public Access | Yes | Yes |
| Fish Species | 17 | 15 |
| Trophic State | oligotrophic | oligotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Thunder Lake wins on overall water quality with a Grade A versus Upper Trelipe Lake's Grade A. Water clarity: 20 ft vs 14 ft. For fishing diversity, Thunder Lake also leads with 17 species.