Grace Lake vs Wolf Lake
Water quality, depth, fish species, and recreation comparison.
Wolf Lake has a higher water quality grade (A, Excellent) than Grace Lake (C, Fair). Both are in Beltrami County, Minnesota.
Both Grace Lake and Wolf 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. Wolf Lake (A) is materially cleaner than Grace Lake (C). A gap that wide is unlikely to close in a single year of remediation work; it reflects multi-decade differences in the lakes themselves.
For a recreational visitor, the wider grade gap is decisive — Wolf 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?
Grace Lake
Crystal clear, you can see 15 ft down.
Wolf Lake
Moderate clarity, visible to about 9 ft.
Side-by-Side Metrics
| Metric | Grace Lake | Wolf Lake |
|---|---|---|
| Overall Grade | C (Fair) | A (Excellent) |
| Water Clarity | 15 ft | 9 ft |
| Phosphorus | 21.5 µg/L | 19 µg/L |
| Chlorophyll-a (Algae) | 9.3 µg/L | 5.3 µg/L |
| Maximum Depth | 42 ft | 57 ft |
| Surface Area | 860 acres | 1,076 acres |
| Public Access | Yes | Yes |
| Fish Species | 13 | 18 |
| Trophic State | mesotrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Wolf Lake wins on overall water quality with a Grade A versus Grace Lake's Grade C. Water clarity: 9 ft vs 15 ft. For fishing diversity, Wolf Lake also leads with 18 species.
Source: EPA National Aquatic Resource Surveys, 2026.