Umatilla County Lake Quality
Oregon, 3 lakes, measured by Oregon DEQ
Umatilla County has 3 monitored 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. 1 of those lake carry recent nutrient and algae readings. The county-level summary describes that subset, not every water body listed. The monitored lakes here are mostly shallow, productive basins where summer algae is common; each lake page shows its own readings beside the EPA condition class.
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. Cold Springs Reservoir has the lowest nutrient and algae readings in the county.
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Quick Answers for Umatilla County
Planning a trip? Check special fishing regulations for Cold Springs Reservoir — or check the official Oregon fishing regulations.
All Lakes in Umatilla County
3 lakes · 1 ranked on readings, 2 without enough sampling1 lake ranked on readings · 2 without enough sampling, hidden
| # | Lake | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|
| 1 | Cold Springs ReservoirUmatilla | No recent samples | No recent samples | 126 µg/L | No recent samples | ✓ Public |
| Mckay LakeUmatilla | 3.3 ft | 121.5 µg/L | 49.4 µg/L | No recent samples | ✓ Public | |
| Langdon LakeUmatilla | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded |
NR = no nutrient or algae reading on record. The measurements are published as the authority reports them. Where the data comes from.
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Source: the Oregon Department of Environmental Quality. See data sources.