Stevens County Lake Quality
Washington, 4 lakes, average grade C (Fair)
Stevens County has 4 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. Spokane Arm -Potential Discharge Location Lake (B) is the cleanest in the county.
Quick Answers for Stevens County
Planning a trip? Check special fishing regulations for Spokane Arm -Potential Discharge Location Lake — or check the official Washington fishing regulations.
All Lakes in Stevens County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Spokane Arm -Potential Discharge Location Lake | B | - | 20 µg/L |
| 2 | Nla Lake | B | 18.7 ft | 50000 µg/L |
| 3 | Nla Lake | D | 7.7 ft | 93000 µg/L |
Other Counties in Washington
See how Stevens 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 Stevens County
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Source: EPA National Aquatic Resource Surveys, 2026.