Denver County Lake Quality
Colorado, 2 lakes, average grade D (Poor)
Only 2 lakes in Denver 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-wide average grade is D — water quality issues are persistent across most of the monitored basins. 1 lakes fall into the F bracket outright.
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 Bluff Lake (D); the most-stressed is Berkeley Lake (F).
Quick Answers for Denver County
Planning a trip? Check special fishing regulations for Bluff Lake — or check the official Colorado fishing regulations.
All Lakes in Denver County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Bluff Lake | D | 4.7 ft | - |
| 2 | Berkeley Lake | F | 1 ft | - |
Other Counties in Colorado
See how Denver County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 12 states.
Where to stay near Denver County
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Source: EPA National Aquatic Resource Surveys, 2026.