San Juan County Lake Quality
Utah, 18 lakes, average grade B (Good)
There are 18 graded lakes in San Juan County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. 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 Recapture Reservoir (B); the most-stressed is Lake Powell Hite Midchannel (F).
Quick Answers for San Juan County
Planning a trip? Check special fishing regulations for Recapture Reservoir — or check the official Utah fishing regulations.
All Lakes in San Juan County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Recapture Reservoir | B | 8.9 ft | - |
| 2 | Dark Canyon Lake | B | 7.2 ft | - |
| 3 | Lake Powell Hite Midchannel | F | 1.3 ft | - |
| 4 | Lake Powell Mid Channel Midway Between Trachyte Creek And Twomile Canyon | F | 0.1 ft | - |
Other Counties in Utah
See how San Juan County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 34 states.
Where to stay near San Juan County
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Source: EPA National Aquatic Resource Surveys, 2026.