Cache County Lake Quality
Utah, 17 lakes, average grade C (Fair)
There are 17 graded lakes in Cache County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. The county average is C — the middle of the rubric, with one or two lakes pulling the average up or down depending on year.
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 Newton Reservoir (A); the most-stressed is Nla Lake (F).
Quick Answers for Cache County
Planning a trip? Check special fishing regulations for Newton Reservoir — or check the official Utah fishing regulations.
All Lakes in Cache County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Newton Reservoir | A | 15.4 ft | - |
| 2 | Newton Reservoir West of Parking Lot | A | 18 ft | - |
| 3 | Nla Lake | A | 12.5 ft | - |
| 4 | Hyrum Reservoir | B | 6.9 ft | - |
| 5 | Porcupine Reservoir | B | 8.5 ft | - |
| 6 | Nla Lake | B | 6.7 ft | - |
| 7 | Third Dam Lake | B | 4.3 ft | - |
| 8 | Cutler Reservoir | D | 1.2 ft | - |
| 9 | Cutler Reservoir | D | 1 ft | - |
| 10 | Nla Lake | F | 0.5 ft | - |
Other Counties in Utah
See how Cache 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 Cache County
Top-rated places to stay near Cache County
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Source: EPA National Aquatic Resource Surveys, 2026.