North Long Lake vs Round Lake
Water quality, depth, fish species, and recreation comparison.
North Long Lake and Round Lake read the same on nutrients and algae. Both are in Crow Wing County, Minnesota.
Both North Long Lake and Round Lake sit in Minnesota. A same-state comparison strips out the state-level water-quality regime as a variable: any differences in the readings here are about the lakes themselves, not the agencies sampling them. The readings are close: North Long Lake and Round 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.
North Long Lake
Crystal clear, you can see 15.1 ft down.
Round Lake
Good clarity, visible to about 13.5 ft.
Side-by-Side Metrics
| Metric | North Long Lake | Round Lake |
|---|---|---|
| Water Clarity | 15.1 ft Better | 13.5 ft |
| Phosphorus | 14 µg/L Better | 17 µg/L |
| Chlorophyll-a (Algae) | 2.7 µg/L | 2.7 µg/L |
| Maximum Depth | 97 ft Better | 51 ft |
| Surface Area | 6,190 acres | 1,650 acres |
| Public Access | Yes | Yes |
| Fish Species | 18 | 20 Better |
| Trophic State | mesotrophic | mesotrophic |
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 North Long Lake or Round Lake against a different lake.
Verdict
Both lakes earn the same Grade A. The tiebreakers come down to clarity (North Long Lake: 15.1 ft, Round Lake: 13.5 ft) and what you want from the lake. North Long Lake has fewer fish species than Round Lake.
Source: EPA National Aquatic Resource Surveys, 2026.