Feldtmann Lake vs Siskiwit Lake
Water quality, depth, fish species, and recreation comparison.
Siskiwit Lake reads lower on nutrients and algae than Feldtmann Lake. Both are in Keweenaw County, Michigan.
Both Feldtmann Lake and Siskiwit Lake sit in Michigan. 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: Feldtmann Lake and Siskiwit 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.
Feldtmann Lake
Moderate clarity, visible to about 7.5 ft.
Siskiwit Lake
Crystal clear, you can see 20.5 ft down.
Side-by-Side Metrics
| Metric | Feldtmann Lake | Siskiwit Lake |
|---|---|---|
| Water Clarity | 7.5 ft | 20.5 ft Better |
| Phosphorus | 11.5 µg/L | 4.4 µg/L Better |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | - | - |
| Surface Area | 462 acres | 4,008 acres |
| Public Access | Unknown | Unknown |
| Fish Species | 3 Better | 2 |
| 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 Siskiwit Lake read the same on nutrients and algae overall. The tiebreakers come down to clarity (Feldtmann Lake: 7.5 ft, Siskiwit Lake: 20.5 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 Siskiwit Lake
Compare cabins, hotels, and vacation rentals around Feldtmann Lake and Siskiwit 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.
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Source: EPA National Aquatic Resource Surveys, 2026.