Clackamas County Lake Quality
Oregon, 1 lakes, average grade A (Excellent)
Only 1 lakes in Clackamas 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, Clackamas County lakes grade an A. That puts it near the top of the {{stateName}} county ranking.
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. Timothy Lake (A) is the cleanest in the county.
Quick Answers for Clackamas County
Planning a trip? Check special fishing regulations for Timothy Lake — or check the official Oregon fishing regulations.
All Lakes in Clackamas County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Timothy Lake | A | - | - |
Other Counties in Oregon
See how Clackamas County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 27 states.
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Source: EPA National Aquatic Resource Surveys, 2026.