Galesville Reservoir is a cold, clear oligotrophic lake in Douglas County, Oregon. Water quality is graded A based on 1 sampling years through 2025. Compared to the 2 other monitored lakes in Douglas County, Galesville Reservoir ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Oregon DNR, last sampled 2025-09-30. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
No clarity data. Chlorophyll-a: 1.4 µg/L. Trophic State Index: 34.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 1.4 µg/L | A |
| Trophic State Index (TSI) | 34 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Galesville Reservoir
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Fishing Galesville Reservoir
Location
County Ranking
Ranked #1 of 3 lakes in Douglas County
Nearby Lakes in Douglas County
Explore Galesville Reservoir across LakeGrade
More Oregon Lake Rankings
Other Grade A Lakes in Oregon
Oligotrophic 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: 2025-09-30
Monitoring stations: 1