Timothy Lake is a cold, clear oligotrophic lake in Clackamas County, Oregon. Water quality is graded A based on 1 sampling years through 2025.
Source: EPA Water Quality Portal sampling records, Oregon DNR, last sampled 2025-10-07. 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: 1.2 µg/L. Trophic State Index: 32.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 1.2 µg/L | A |
| Trophic State Index (TSI) | 32 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
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Fishing Timothy Lake
Location
County Ranking
Ranked #1 of 1 lakes in Clackamas County
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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: 2025-10-07
Monitoring stations: 1