Gunnison County Lake Quality
Colorado, 2 lakes, average grade B (Good)
Only 2 lakes in Gunnison 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. With an average grade of B, Gunnison County sits comfortably above the {{stateName}} median.
Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Blue Mesa Reservoir (B) is the cleanest in the county.
Quick Answers for Gunnison County
Planning a trip? Check special fishing regulations for Blue Mesa Reservoir — or check the official Colorado fishing regulations.
All Lakes in Gunnison County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Blue Mesa Reservoir | B | 11.5 ft | 35 µg/L |
Other Counties in Colorado
See how Gunnison 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 Gunnison County
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Source: EPA National Aquatic Resource Surveys, 2026.