Rimrock Reservoir is a cold, clear oligotrophic lake in Yakima County, Washington. Water quality is graded A based on 2 sampling years through 2023. Compared to the 3 other monitored lakes in Yakima County, Rimrock Reservoir ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Washington DNR, last sampled 2023-07-27. Grade methodology: LakeGrade methodology.
Watch Rimrock Reservoir water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
No clarity data. Phosphorus level: 15 µg/L. Chlorophyll-a: 1.8 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 15 µg/L | A |
| Chlorophyll-a (Algae) | 1.8 µg/L | A |
| Trophic State Index (TSI) | 40 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Rimrock Reservoir
Compare lakeside cabins, hotels, and vacation rentals near Rimrock Reservoir in Yakima County, Washington — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Rimrock Reservoir
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Rimrock Reservoir?
Get lake water-quality report cards plus the best cabin & lodging deals near Rimrock Reservoir — straight to your inbox. No spam, unsubscribe anytime.
Fishing Rimrock Reservoir
Location
County Ranking
Ranked #1 of 4 lakes in Yakima County
Nearby Lakes in Yakima County
Explore Rimrock Reservoir 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: 2023-07-27
Monitoring stations: 1