O'Brien Lake vs Swan Lake
Water quality, depth, fish species, and recreation comparison.
Swan Lake has a higher water quality grade (A, Excellent) than O'Brien Lake (B, Good). Both are in Itasca County, Minnesota.
O'Brien Lake and Swan Lake 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. These two are within a letter of each other on the rubric — O'Brien Lake (B) versus Swan Lake (A). The deciding factors for a recreational visitor are likely physical (depth, access, fish species) rather than water-quality differences.
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.
O'Brien Lake
Good clarity, visible to about 13.1 ft.
Swan Lake
Good clarity, visible to about 13.5 ft.
Side-by-Side Metrics
| Metric | O'Brien Lake | Swan Lake |
|---|---|---|
| Overall Grade | B (Good) | A (Excellent) |
| Water Clarity | 13.1 ft | 13.5 ft |
| Phosphorus | No data | 18 µg/L |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 63 ft | 65 ft |
| Surface Area | 538.96 acres | 2.5K acres |
| Public Access | No | Yes |
| Fish Species | 10 | 17 |
| Trophic State | mesotrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Swan Lake wins on overall water quality with a Grade A versus O'Brien Lake's Grade B. Water clarity: 13.5 ft vs 13.1 ft. For fishing diversity, Swan Lake also leads with 17 species.