Carlyle Lake vs Raccoon Lake
Water quality, depth, fish species, and recreation comparison.
Carlyle Lake and Raccoon Lake both received the same overall water quality grade of F (Algae-prone). Both are in Illinois.
Both Carlyle Lake and Raccoon Lake sit in Illinois. 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 — Carlyle Lake (F) versus Raccoon 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.
Carlyle Lake
Very murky, less than 1.8 ft of visibility.
Raccoon Lake
Very murky, less than 1.2 ft of visibility.
Side-by-Side Metrics
| Metric | Carlyle Lake | Raccoon Lake |
|---|---|---|
| Overall Grade | F (Algae-prone) | F (Algae-prone) |
| Water Clarity | 1.8 ft Better | 1.2 ft |
| Phosphorus | 238.5 µg/L Better | 285 µg/L |
| Chlorophyll-a (Algae) | 38.8 µg/L Better | 73.5 µg/L |
| Maximum Depth | - | - |
| Surface Area | 24,580 acres | 730 acres |
| Public Access | Yes | Yes |
| Fish Species | 0 | 0 |
| Trophic State | hypereutrophic | hypereutrophic |
A green ✓ marks the better value for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better). Surface area and trophic state carry no tick — a bigger lake is not a better lake.
Swap a lake
Compare Carlyle Lake or Raccoon Lake against a different lake.
Verdict
Both lakes earn the same Grade F. The tiebreakers come down to clarity (Carlyle Lake: 1.8 ft, Raccoon Lake: 1.2 ft) and what you want from the lake. Carlyle Lake matches its peer on species count.
Source: EPA National Aquatic Resource Surveys, 2026.