Cold Springs Reservoir is a highly nutrient-loaded hypereutrophic lake in Umatilla County, Oregon. Water quality is graded F based on 1 sampling years through 2025. Compared to the 3 other monitored lakes in Umatilla County, Cold Springs Reservoir ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, Oregon DNR, last sampled 2025-09-03. Grade methodology: LakeGrade methodology.
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Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
No clarity data. Chlorophyll-a: 126 µg/L. Trophic State Index: 78.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 126 µg/L | F |
| Trophic State Index (TSI) | 78 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Cold Springs Reservoir
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Fishing Cold Springs Reservoir
Location
County Ranking
Ranked #4 of 4 lakes in Umatilla County
Nearby Lakes in Umatilla County
Explore Cold Springs Reservoir across LakeGrade
More Oregon Lake Rankings
Other Grade F Lakes in Oregon
Hypereutrophic Lakes in Oregon
More records, surveys & data sources
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2025-09-03
Monitoring stations: 1