North Long Lake vs Twin Lake
Water quality, depth, fish species, and recreation comparison.
North Long Lake has a higher water quality grade (A, Excellent) than Twin Lake (D, Poor). Both are in Crow Wing County, Minnesota.
Both North Long Lake and Twin 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. The grades are meaningfully apart: North Long Lake grades a A while Twin Lake grades a D. That two-letter spread reflects real underlying differences — different watershed inputs, different depth profiles, or different monitoring rigor.
For a recreational visitor, the wider grade gap is decisive — North Long 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?
North Long Lake
Crystal clear, you can see 15.1 ft down.
Twin Lake
Murky, only visible to about 4.5 ft.
Side-by-Side Metrics
| Metric | North Long Lake | Twin Lake |
|---|---|---|
| Overall Grade | A (Excellent) | D (Poor) |
| Water Clarity | 15.1 ft | 4.5 ft |
| Phosphorus | 14 µg/L | No data |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 97 ft | 30 ft |
| Surface Area | 6.2K acres | 491.76 acres |
| Public Access | Yes | Yes |
| Fish Species | 18 | 13 |
| Trophic State | mesotrophic | eutrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
North Long Lake wins on overall water quality with a Grade A versus Twin Lake's Grade D. Water clarity: 15.1 ft vs 4.5 ft. For fishing diversity, North Long Lake also leads with 18 species.