Grant County Lake Quality
New Mexico, 3 lakes, average grade D (Poor)
Only 3 lakes in Grant 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. On average, Grant 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 Nla Lake (C); the most-stressed is Lake Roberts (F).
Quick Answers for Grant County
Planning a trip? Check special fishing regulations for Nla Lake — or check the official New Mexico fishing regulations.
All Lakes in Grant County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Nla Lake | C | 9.8 ft | 91.2 µg/L |
| 2 | Bear Canyon Reservoir Deep | C | 3.3 ft | - |
| 3 | Lake Roberts | F | 5.7 ft | - |
Other Counties in New Mexico
See how Grant 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 Grant County
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Source: EPA National Aquatic Resource Surveys, 2026.