North Long Lake vs Serpent Lake
Water quality, depth, fish species, and recreation comparison.
North Long Lake and Serpent Lake both received the same overall water quality grade of A (Excellent). Both are in Crow Wing County, Minnesota.
Both North Long Lake and Serpent 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. These two are within a letter of each other on the rubric — North Long Lake (A) versus Serpent 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.
North Long Lake
Crystal clear, you can see 15.1 ft down.
Serpent Lake
Crystal clear, you can see 25 ft down.
Side-by-Side Metrics
| Metric | North Long Lake | Serpent Lake |
|---|---|---|
| Overall Grade | A (Excellent) | A (Excellent) |
| Water Clarity | 15.1 ft | 25 ft |
| Phosphorus | 14 µg/L | 12 µg/L |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 97 ft | 65 ft |
| Surface Area | 6.2K acres | 1.1K acres |
| Public Access | Yes | Yes |
| Fish Species | 18 | 17 |
| Trophic State | mesotrophic | oligotrophic |
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 (North Long Lake: 15.1 ft, Serpent Lake: 25 ft) and what you want from the lake. North Long Lake supports more documented fish species.