Park County Lake Quality
Colorado, 2 lakes, average grade B (Good)
Only 2 lakes in Park County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. The county-wide average lands at B — solid water quality with most lakes carrying clear summer transparency and low-to-moderate phosphorus.
The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Antero Reservoir (B); the most-stressed is Antero Reservoir (B).
Quick Answers for Park County
Planning a trip? Check special fishing regulations for Antero Reservoir — or check the official Colorado fishing regulations.
All Lakes in Park County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Antero Reservoir | B | 14.8 ft | - |
| 2 | Elevenmile Reservoir | B | 13.1 ft | - |
Other Counties in Colorado
See how Park County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 12 states.
Where to stay near Park County
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Source: EPA National Aquatic Resource Surveys, 2026.