Harmon County Lake Quality
Oklahoma, 1 lakes, average grade (Not rated)
Only 1 lakes in Harmon 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.
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 Hall Lake (—); the most-stressed is Hall Lake (—).
Quick Answers for Harmon County
Planning a trip? Check special fishing regulations for Hall Lake — or check the official Oklahoma fishing regulations.
All Lakes in Harmon County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Hall Lake | 2.4 ft | - |
Other Counties in Oklahoma
See how Harmon County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 36 states and 2 Canadian provinces.
Where to stay near Harmon County
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Source: EPA National Aquatic Resource Surveys, 2026.