Girl Lake vs Long Lake
Water quality, depth, fish species, and recreation comparison.
Long Lake reads lower on nutrients and algae than Girl Lake. Both are in Cass County, Minnesota.
Both Girl Lake and Long 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. These two sit close on their nutrient and algae readings, Girl Lake versus Long Lake. The deciding factors for a recreational visitor are likely physical (depth, access, fish species) rather than water-quality differences.
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.
Girl Lake
Crystal clear, you can see 17.6 ft down.
Long Lake
Crystal clear, you can see 21.5 ft down.
Side-by-Side Metrics
| Metric | Girl Lake | Long Lake |
|---|---|---|
| Water Clarity | 17.6 ft | 21.5 ft Better |
| Phosphorus | 12 µg/L | 9 µg/L Better |
| Chlorophyll-a (Algae) | 2.7 µg/L Better | 3 µg/L |
| Maximum Depth | 81 ft | 115 ft Better |
| Surface Area | 428 acres | 1,007 acres |
| Public Access | Yes | Yes |
| Fish Species | 18 Better | 14 |
| Trophic State | oligotrophic | oligotrophic |
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.
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Verdict
Girl Lake and Long Lake read the same on nutrients and algae overall. The tiebreakers come down to clarity (Girl Lake: 17.6 ft, Long Lake: 21.5 ft) and what you want from the lake. Girl Lake supports more documented fish species.
Stays via Stay22
Where to stay near Girl Lake and Long Lake
Compare cabins, hotels, and vacation rentals around Girl Lake and Long Lake. Both lakes are pinned on the map, so you can see which stays sit nearer the one you pick. Switch to Satellite to see how close each is to the water.
Top-rated places to stay near Girl Lake and Long Lake
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Source: EPA National Aquatic Resource Surveys, 2026.