Cleveland County Lake Quality
Oklahoma, 7 lakes, average grade D (Nutrient-rich)
Cleveland County has 7 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. 3 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. On average, Cleveland 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 Lake Thunderbird (D); the most-stressed is Lake Thunderbird (D).
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Quick Answers for Cleveland County
Planning a trip? Check special fishing regulations for Lake Thunderbird — or check the official Oklahoma fishing regulations.
All Lakes in Cleveland County
7 lakes · 3 graded, 4 not rated3 graded lakes · 4 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | DLake ThunderbirdCleveland | D | 1.7 ft | 59 µg/L | 28.7 µg/L | No recent samples | ✓ Public |
| 2 | DThunderbird Lake Hog CreekCleveland | D | No recent samples | 33 µg/L | 17.8 µg/L | No recent samples | ✓ Public |
| 3 | DThunderbird Lake Fisherman'SCleveland | D | No recent samples | 31.5 µg/L | 21.4 µg/L | No recent samples | ✓ Public |
| NRLake Stanley DraperCleveland | NR | 4 ft | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRThunderbird Lake IndianhillsCleveland | NR | No recent samples | 68 µg/L | No recent samples | No recent samples | Not recorded | |
| NRReynolds LakeCleveland | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRLazy Day LakeCleveland | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded |
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 Cleveland 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.