Ross Lake is a cold, clear oligotrophic lake in Whatcom County, Washington. Water quality is graded A based on 2 sampling years through 2023. Compared to the 3 other monitored lakes in Whatcom County, Ross Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Washington DNR, last sampled 2023-06-28. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Crystal clear, you can see 18.8 ft down. Phosphorus level: 4.5 µg/L. Trophic State Index: 30.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 18.8 ft | A |
| Phosphorus | 4.5 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 30 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Ross Lake
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Fishing Ross Lake
Location
County Ranking
Ranked #1 of 4 lakes in Whatcom County
Nearby Lakes in Whatcom County
Explore Ross Lake across LakeGrade
More Washington Lake Rankings
Other Grade A Lakes in Washington
Oligotrophic Lakes in Washington
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: 2023-06-28
Monitoring stations: 1