Lake Beulah vs Mill Lake
Water quality, depth, fish species, and recreation comparison.
Lake Beulah has a higher water quality grade (A, Excellent) than Mill Lake (B, Good). Both are in Walworth County, Wisconsin.
Lake Beulah and Mill 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. These two are within a letter of each other on the rubric — Lake Beulah (A) versus Mill Lake (B). The deciding factors for a recreational visitor are likely physical (depth, access, fish species) rather than water-quality differences.
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.
Lake Beulah
Good clarity, visible to about 11 ft.
Mill Lake
Moderate clarity, visible to about 7.5 ft.
Side-by-Side Metrics
| Metric | Lake Beulah | Mill Lake |
|---|---|---|
| Overall Grade | A (Excellent) | B (Good) |
| Water Clarity | 11 ft | 7.5 ft |
| Phosphorus | 13 µg/L | 15.3 µg/L |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | - | - |
| Surface Area | 834 acres | 834 acres |
| Public Access | Unknown | Unknown |
| Fish Species | 0 | 0 |
| Trophic State | mesotrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Lake Beulah wins on overall water quality with a Grade A versus Mill Lake's Grade B. Water clarity: 11 ft vs 7.5 ft. For fishing diversity, Lake Beulah also leads with 0 species.