Custer County Lake Quality
Oklahoma, 2 lakes, average grade (Not rated)
Only 2 lakes in Custer 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 Foss Reservoir (—); the most-stressed is Foss Reservoir (—).
Quick Answers for Custer County
Planning a trip? Check special fishing regulations for Foss Reservoir — or check the official Oklahoma fishing regulations.
All Lakes in Custer County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Foss Reservoir | 3.9 ft | - | |
| 2 | Chickasha Lake | - | - |
Other Counties in Oklahoma
See how Custer 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 Custer County
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Source: EPA National Aquatic Resource Surveys, 2026.