Canadian County Lake Quality
Oklahoma, 4 lakes, average grade F (Very Poor)
Only 4 lakes in Canadian 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 average is F — the most-stressed bracket in our rubric. Most monitored lakes here show persistent nutrient loading and algal pressure.
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 Lake (D) is the cleanest in the county.
Quick Answers for Canadian County
Planning a trip? Check special fishing regulations for Nla Lake — or check the official Oklahoma fishing regulations.
All Lakes in Canadian County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Nla Lake | D | 0.9 ft | 172049.2 µg/L |
| 2 | Nla Lake | F | 0.7 ft | 245280.7 µg/L |
| 3 | Nla Lake | F | 1.1 ft | 104 µg/L |
| 4 | Nla Lake | F | 0.5 ft | 640.4 µg/L |
Other Counties in Oklahoma
See how Canadian County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 34 states.
Where to stay near Canadian County
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Source: EPA National Aquatic Resource Surveys, 2026.