Liberty County Lake Quality
Montana, 1 lakes, average grade F (Very Poor)
Only 1 lakes in Liberty 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 (F) is the cleanest in the county.
Quick Answers for Liberty County
Planning a trip? Check special fishing regulations for Nla Lake — or check the official Montana fishing regulations.
All Lakes in Liberty County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Nla Lake | F | - | 738000 µg/L |
Other Counties in Montana
See how Liberty 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 Liberty County
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Source: EPA National Aquatic Resource Surveys, 2026.