Lane County Lake Quality
Oregon, 3 lakes, average grade A (Excellent)
Lane County has 3 graded lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. The county's average grade is A — among the cleanest in {{stateName}}. 2 lakes pull an A on their own, and almost none fall into the D or F brackets.
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 Blue River Lake (A); the most-stressed is Siltcoos Lake (B).
Quick Answers for Lane County
Planning a trip? Check special fishing regulations for Blue River Lake — or check the official Oregon fishing regulations.
All Lakes in Lane County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Blue River Lake | A | - | 10 µg/L |
| 2 | Cougar Lake | A | - | - |
| 3 | Siltcoos Lake | B | - | - |
Other Counties in Oregon
See how Lane County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 27 states.
Where to stay near Lane County
Top-rated places to stay near Lane County
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Source: EPA National Aquatic Resource Surveys, 2026.