Rio Grande County Lake Quality
Colorado, 1 lakes, average grade D (Poor)
Only 1 lakes in Rio Grande 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 grade is D — water quality issues are persistent across most of the monitored basins. 0 lakes fall into the F bracket outright.
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 Beaver Creek Reservoir (D); the most-stressed is Beaver Creek Reservoir (D).
Quick Answers for Rio Grande County
Planning a trip? Check special fishing regulations for Beaver Creek Reservoir — or check the official Colorado fishing regulations.
All Lakes in Rio Grande County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Beaver Creek Reservoir | D | 6.2 ft | - |
Other Counties in Colorado
See how Rio Grande 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 Rio Grande County
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Source: EPA National Aquatic Resource Surveys, 2026.