Grays Harbor County Lake Quality
Washington, 3 lakes, average grade B (Good)
Only 3 lakes in Grays Harbor 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. With an average grade of B, Grays Harbor County sits comfortably above the {{stateName}} median.
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. Nla Upper Lake (A) is the cleanest in the county.
Quick Answers for Grays Harbor County
Planning a trip? Check special fishing regulations for Nla Upper Lake — or check the official Washington fishing regulations.
All Lakes in Grays Harbor County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Nla Upper Lake | A | - | 12.4 µg/L |
| 2 | Nla Lower Lake | B | - | 38.9 µg/L |
| 3 | Nla Lake | C | 10.6 ft | 36011.4 µg/L |
Other Counties in Washington
See how Grays Harbor County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 34 states.
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Source: EPA National Aquatic Resource Surveys, 2026.