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LakeQuality
F

Bent County Lake Quality

Colorado, 1 lakes, average grade F (Very Poor)

Only 1 lakes in Bent 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.

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 John Martin Reservoir (F); the most-stressed is John Martin Reservoir (F).

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All Lakes in Bent County

RankLakeGradeClarityPhosphorus
1John Martin ReservoirF3.1 ft-

See how Bent County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 12 states.

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Source: EPA National Aquatic Resource Surveys, 2026.