Deschutes River Arm Lake is a productive, nutrient-rich eutrophic lake in Jefferson County, Oregon. Water quality is graded B based on 2 sampling years through 2025. Compared to the 14 other monitored lakes in Jefferson County, Deschutes River Arm Lake ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, Oregon DNR, last sampled 2025-09-10. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Murky, only visible to about 4.6 ft. Chlorophyll-a: 4.4 µg/L. Trophic State Index: 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.6 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 4.4 µg/L | A |
| Trophic State Index (TSI) | 50 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Deschutes River Arm Lake
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Fishing Deschutes River Arm Lake
Location
County Ranking
Ranked #4 of 15 lakes in Jefferson County
Nearby Lakes in Jefferson County
Explore Deschutes River Arm Lake across LakeGrade
More Oregon Lake Rankings
Other Grade B Lakes in Oregon
Eutrophic 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: 2025-09-10
Monitoring stations: 1