Corydon Reservoir vs Red Haw Lake
Water quality, depth, fish species, and recreation comparison.
Corydon Reservoir and Red Haw Lake both received the same overall water quality grade of F (Very Poor). Both are in Wisconsin.
Corydon Reservoir and Red Haw Lake are both in Iowa — 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 — Corydon Reservoir (F) versus Red Haw 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.
Corydon Reservoir
Very murky, less than 1.9 ft of visibility.
Red Haw Lake
Very murky, less than 3.1 ft of visibility.
Side-by-Side Metrics
| Metric | Corydon Reservoir | Red Haw Lake |
|---|---|---|
| Overall Grade | F (Very Poor) | F (Very Poor) |
| Water Clarity | 1.9 ft | 3.1 ft |
| Phosphorus | No data | No data |
| Chlorophyll-a (Algae) | 44 µg/L | 30.8 µg/L |
| Maximum Depth | - | - |
| Surface Area | 66.9 acres | 93 acres |
| Public Access | Unknown | Unknown |
| Fish Species | 0 | 0 |
| Trophic State | eutrophic | eutrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Both lakes earn the same Grade F. The tiebreakers come down to clarity (Corydon Reservoir: 1.9 ft, Red Haw Lake: 3.1 ft) and what you want from the lake. Corydon Reservoir matches its peer on species count.