Arapahoe County Lake Quality
Colorado, 2 lakes, average grade (Not rated)
Only 2 lakes in Arapahoe 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'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 Cherry Creek Reservoir Top (—); the most-stressed is Cherry Creek Reservoir Top (—).
Quick Answers for Arapahoe County
Planning a trip? Check special fishing regulations for Cherry Creek Reservoir Top — or check the official Colorado fishing regulations.
All Lakes in Arapahoe County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Cherry Creek Reservoir Top | - | 59 µg/L | |
| 2 | Cherry Creek Reservoir Bottom | - | 76 µg/L |
Other Counties in Colorado
See how Arapahoe County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 36 states and 2 Canadian provinces.
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Source: EPA National Aquatic Resource Surveys, 2026.