Guernsey Reservoir is a productive, nutrient-rich eutrophic lake in Platte County, Wyoming. Water quality is graded C based on 2 sampling years through 2018. Compared to the 14 other monitored lakes in Platte County, Guernsey Reservoir ranks #10 for water quality.
Source: EPA Water Quality Portal sampling records, Wyoming DNR, last sampled 2018-09-05. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Murky, only visible to about 4.9 ft. Phosphorus level: 20 µg/L. Trophic State Index: 51.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.9 ft | D |
| Phosphorus | 20 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 51 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Guernsey Reservoir
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Fishing Guernsey Reservoir
Location
County Ranking
Ranked #10 of 15 lakes in Platte County
Cleaner Lakes Within 30 Miles
Guernsey Reservoir holds Grade C. 2 nearby lakes hold higher grades.
- BGlendo Reservoir Lacustrine LittoralPlatte County · 14.2 mi · Higher grade (C → B)
- BGlendo Reservoir Lacustrine EmbaymentPlatte County · 14.4 mi · Higher grade (C → B)
Nearby Lakes in Platte County
Explore Guernsey Reservoir across LakeGrade
More Wyoming Lake Rankings
Other Grade C Lakes in Wyoming
Eutrophic 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: 2018-09-05
Monitoring stations: 3