Morrow County Lake Quality
Oregon, 1 lakes, average grade C (Fair)
Morrow County has 1 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 average is C — the middle of the rubric, with one or two lakes pulling the average up or down depending on year.
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 Willow Creek Reservoir (C); the most-stressed is Willow Creek Reservoir (C).
Quick Answers for Morrow County
Planning a trip? Check special fishing regulations for Willow Creek Reservoir — or check the official Oregon fishing regulations.
All Lakes in Morrow County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Willow Creek Reservoir | C | 9.8 ft | - |
Other Counties in Oregon
See how Morrow 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 Morrow County
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Source: EPA National Aquatic Resource Surveys, 2026.