Marengo County Lake Quality
Alabama, 3 lakes, average grade D (Poor)
Marengo County has 3 graded 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. On average, Marengo 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 Cofc Lake (C); the most-stressed is Nla Lake (D).
Quick Answers for Marengo County
Planning a trip? Check special fishing regulations for Cofc Lake — or check the official Alabama fishing regulations.
All Lakes in Marengo County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Cofc Lake | C | 2 ft | 32.5 µg/L |
| 2 | Nla Lake | D | 2 ft | 100.4 µg/L |
| 3 | Nla Lake | D | 5.1 ft | 52 µg/L |
Other Counties in Alabama
See how Marengo 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 Marengo County
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Source: EPA National Aquatic Resource Surveys, 2026.