Tooele County Lake Quality
Utah, 9 lakes, average grade C (Fair)
Tooele County has 9 graded lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. The county average is C — the middle of the rubric, with one or two lakes pulling the average up or down depending on year.
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. Settlement Canyon Reservoir (B) is the cleanest in the county.
Quick Answers for Tooele County
Planning a trip? Check special fishing regulations for Settlement Canyon Reservoir — or check the official Utah fishing regulations.
All Lakes in Tooele County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Settlement Canyon Reservoir | B | 8.5 ft | - |
| 2 | Grantsville Reservoir | B | 5.9 ft | - |
| 3 | Nla Lake | D | 1.2 ft | - |
Other Counties in Utah
See how Tooele 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 Tooele County
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Source: EPA National Aquatic Resource Surveys, 2026.