Feldtmann Lake vs Gratiot Lake
Water quality, depth, fish species, and recreation comparison.
Gratiot Lake reads lower on nutrients and algae than Feldtmann Lake. Both are in Keweenaw County, Michigan.
Feldtmann Lake and Gratiot Lake are both in Michigan — 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 sit close on their nutrient and algae readings, Feldtmann Lake versus Gratiot 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.
Feldtmann Lake
Moderate clarity, visible to about 7.5 ft.
Gratiot Lake
Crystal clear, you can see 17 ft down.
Side-by-Side Metrics
| Metric | Feldtmann Lake | Gratiot Lake |
|---|---|---|
| Water Clarity | 7.5 ft | 17 ft Better |
| Phosphorus | 11.5 µg/L | 9 µg/L Better |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | - | 70 ft |
| Surface Area | 462 acres | 1,453 acres |
| Public Access | Unknown | Unknown |
| Fish Species | 3 Better | 1 |
| Trophic State | mesotrophic | 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
Feldtmann Lake and Gratiot Lake read the same on nutrients and algae overall. The tiebreakers come down to clarity (Feldtmann Lake: 7.5 ft, Gratiot Lake: 17 ft) and what you want from the lake. Feldtmann Lake supports more documented fish species.
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Where to stay near Feldtmann Lake and Gratiot Lake
Compare cabins, hotels, and vacation rentals around Feldtmann Lake and Gratiot 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 Feldtmann Lake and Gratiot Lake
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Source: EPA National Aquatic Resource Surveys, 2026.