Rock Lake is a mesotrophic lake in Platte County, Wyoming. Water quality is graded B based on 2 sampling years through 2015. Compared to the 14 other monitored lakes in Platte County, Rock Lake ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, Wyoming DNR, last sampled 2015-09-03. Grade methodology: LakeGrade methodology.
Watch Rock Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Murky, only visible to about 3.8 ft. Phosphorus level: 12.5 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.8 ft | D |
| Phosphorus | 12.5 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Rock Lake
Compare lakeside cabins, hotels, and vacation rentals near Rock Lake in Platte County, Wyoming — 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 Rock Lake
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 Rock Lake?
Get lake water-quality report cards plus the best cabin & lodging deals near Rock Lake — straight to your inbox. No spam, unsubscribe anytime.
Fishing Rock Lake
Location
County Ranking
Ranked #4 of 15 lakes in Platte County
Cleaner Lakes Within 30 Miles
Rock Lake holds Grade B. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Platte County
Explore Rock Lake across LakeGrade
More Wyoming Lake Rankings
Other Grade B Lakes in Wyoming
Mesotrophic Lakes in Wyoming
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: 2015-09-03
Monitoring stations: 1