Echo Lake vs Thomson Reservoir
Water quality, depth, fish species, and recreation comparison.
Echo Lake has a higher water quality grade (B, Good) than Thomson Reservoir (F, Very Poor). Both are in Carlton County, Minnesota.
Echo Lake and Thomson Reservoir are both in Minnesota — 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. Echo Lake (B) is materially cleaner than Thomson Reservoir (F). A gap that wide is unlikely to close in a single year of remediation work; it reflects multi-decade differences in the lakes themselves.
For a recreational visitor, the wider grade gap is decisive — Echo Lake is the better water-quality choice. For a researcher, the gap is the interesting part: what is different about the two watersheds, and which of those differences is mutable?
Echo Lake
Good clarity, visible to about 11 ft.
Thomson Reservoir
Very murky, less than 3 ft of visibility.
Side-by-Side Metrics
| Metric | Echo Lake | Thomson Reservoir |
|---|---|---|
| Overall Grade | B (Good) | F (Very Poor) |
| Water Clarity | 11 ft | 3 ft |
| Phosphorus | No data | No data |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | - | - |
| Surface Area | 10 acres | 375 acres |
| Public Access | Unknown | Unknown |
| Fish Species | 1 | 1 |
| Trophic State | mesotrophic | eutrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Echo Lake wins on overall water quality with a Grade B versus Thomson Reservoir's Grade F. Water clarity: 11 ft vs 3 ft. For fishing diversity, Echo Lake also leads with 1 species.