Crooked Creek Lake vs Keystone Lake
Water quality, depth, fish species, and recreation comparison.
Keystone Lake has a higher water quality grade (B, Good) than Crooked Creek Lake (C, Fair). Both are in Armstrong County, Pennsylvania.
Both Crooked Creek Lake and Keystone Lake sit in Pennsylvania. 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 — Crooked Creek Lake (C) versus Keystone 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.
Crooked Creek Lake
No clarity data.
Keystone Lake
No clarity data.
Side-by-Side Metrics
| Metric | Crooked Creek Lake | Keystone Lake |
|---|---|---|
| Overall Grade | C (Fair) | B (Good) Better |
| Water Clarity | No data | No data |
| Phosphorus | 23 µg/L | 12.5 µg/L Better |
| Chlorophyll-a (Algae) | 19.3 µg/L | 13.6 µg/L Better |
| Maximum Depth | - | - |
| Surface Area | 518 acres | 865 acres |
| Public Access | Unknown | Yes |
| Fish Species | 0 | 0 |
| Trophic State | Unknown | Unknown |
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.
Verdict
Keystone Lake wins on overall water quality with a Grade B versus Crooked Creek Lake's Grade C. For fishing diversity, Keystone Lake also leads with 0 species.
Source: EPA National Aquatic Resource Surveys, 2026.