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LakeQuality

Elmwood Lake vs Unionville Lake

Water quality, depth, fish species, and recreation comparison.

Elmwood Lake has a higher water quality grade (F, Very Poor) than Unionville Lake (F, Very Poor). Both are in Wisconsin.

Both Elmwood Lake and Unionville Lake sit in Missouri. 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. These two are within a letter of each other on the rubric — Elmwood Lake (F) versus Unionville Lake (F). 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.

F

Elmwood Lake

Sullivan County, Wisconsin

Very murky, less than 2.7 ft of visibility.

F

Unionville Lake

Putnam County, Wisconsin

Very murky, less than 1.6 ft of visibility.

Side-by-Side Metrics

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

MetricElmwood LakeUnionville Lake
Overall GradeF (Very Poor)F (Very Poor)
Water Clarity2.7 ft1.6 ft
Phosphorus70.8 µg/L129.5 µg/L
Chlorophyll-a (Algae)35.2 µg/L57.5 µg/L
Maximum Depth--
Surface Area224 acres75 acres
Public AccessUnknownUnknown
Fish Species00
Trophic Stateeutrophichypereutrophic

Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).

Verdict

Elmwood Lake wins on overall water quality with a Grade F versus Unionville Lake's Grade F. Water clarity: 2.7 ft vs 1.6 ft. For fishing diversity, Elmwood Lake also leads with 0 species.