Fountain Lake vs Marl Lake
Water quality, depth, fish species, and recreation comparison.
Fountain Lake has a higher water quality grade (A, Excellent) than Marl Lake (A, Excellent). Both are in Wisconsin.
Fountain Lake and Marl Lake are both in Wisconsin — 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. The grades are close: Fountain Lake (A) and Marl Lake (A) are within one letter of each other on the LakeGrade rubric. The per-parameter sub-grades below will show where the small differences actually live.
With grades 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.
Fountain Lake
Crystal clear, you can see 22 ft down.
Marl Lake
Good clarity, visible to about 13.6 ft.
Side-by-Side Metrics
| Metric | Fountain Lake | Marl Lake |
|---|---|---|
| Overall Grade | A (Excellent) | A (Excellent) |
| Water Clarity | 22 ft | 13.6 ft |
| Phosphorus | No data | 9.9 µg/L |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | - | - |
| Surface Area | 16 acres | 22 acres |
| Public Access | Unknown | Unknown |
| Fish Species | 0 | 0 |
| Trophic State | oligotrophic | oligotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Fountain Lake wins on overall water quality with a Grade A versus Marl Lake's Grade A. Water clarity: 22 ft vs 13.6 ft. For fishing diversity, Fountain Lake also leads with 0 species.