Cullaby Lake is a productive, nutrient-rich eutrophic lake in Clatsop County, Oregon. Water quality is graded F based on 1 sampling years through 2025.
Source: EPA Water Quality Portal sampling records, Oregon DNR, last sampled 2025-10-15. 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: 36.8 µg/L. Trophic State Index: 66.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 36.8 µg/L | F |
| Trophic State Index (TSI) | 66 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Cullaby Lake
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Fishing Cullaby Lake
Location
County Ranking
Ranked #1 of 1 lakes in Clatsop 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: 2025-10-15
Monitoring stations: 1