Caddo County Lake Quality
Oklahoma, 3 lakes, average grade D (Nutrient-rich)
Caddo County has 3 monitored 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. 1 of those lake carry an A–F grade. The county-level summary describes that subset, not every water body listed. On average, Caddo County lakes grade D, with phosphorus loading and reduced clarity showing up across most of the dataset.
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 Ft. Cobb Lake (D); the most-stressed is Ft. Cobb Lake (D).
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Quick Answers for Caddo County
Planning a trip? Check special fishing regulations for Ft. Cobb Lake — or check the official Oklahoma fishing regulations.
All Lakes in Caddo County
3 lakes · 1 graded, 2 not rated1 graded lake · 2 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | DFt. Cobb LakeCaddo | D | No recent samples | 220 µg/L | No recent samples | No recent samples | Not recorded |
| NRFort Cobb ReservoirCaddo | NR | 1.8 ft | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRLake ChickashaCaddo | NR | 1.5 ft | 70 µg/L | No recent samples | No recent samples | ✓ Public |
NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
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Other Counties in Oklahoma
See how Caddo County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..
Source: EPA National Aquatic Resource Surveys, 2026.