Siltcoos Lake is a mesotrophic lake in Lane County, Oregon. Water quality is graded B based on 1 sampling years through 2025. Compared to the 2 other monitored lakes in Lane County, Siltcoos Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Oregon DNR, last sampled 2025-10-16. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
No clarity data. Chlorophyll-a: 6.4 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 6.4 µg/L | B |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Siltcoos Lake
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Fishing Siltcoos Lake
Location
County Ranking
Ranked #3 of 3 lakes in Lane County
Nearby Lakes in Lane County
Explore Siltcoos Lake across LakeGrade
More Oregon Lake Rankings
Other Grade B Lakes in Oregon
Mesotrophic 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: 2025-10-16
Monitoring stations: 1