Boysen Reservoir Transitional Embayment
Fremont County, WyomingView mapDirections
Wyoming DEQ publishes the water-quality measurements for Boysen Reservoir Transitional Embayment. Here is what has been measured.
- Oligotrophic
Boysen Reservoir Transitional Embayment in Fremont County, Wyoming has water-quality measurements published by Wyoming DEQ, shown here as reported. Water clarity: 11 ft visibility. Phosphorus: 10 µg/L.
Boysen Reservoir Transitional Embayment is a cold, clear oligotrophic lake in Fremont County, Wyoming. Overall water quality is declining over recent sampling years. Compared to the 17 other monitored lakes in Fremont County, Boysen Reservoir Transitional Embayment ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2023-10-10. Methodology: how these readings are compared.
What Boysen Reservoir Transitional Embayment is good for
From access and monitoring records, not editorial picks.
- Clear water11 ft of visibility
Swimming conditions
Readings onlyLow algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Boysen Reservoir Transitional Embayment is safe to swim in today is a call for the Wyoming Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Boysen Reservoir Transitional Embayment
These are the measurements Wyoming DEQ publishes for Boysen Reservoir Transitional Embayment, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 11 ft. Phosphorus 10 µg/L. TSI 40.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 11ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 10µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 40 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Boysen Reservoir Transitional Embayment
Answers come straight from the public measurements and survey records on this page.
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Fishing Boysen Reservoir Transitional Embayment
Water Quality Trend: Worsening
Based on 4 years of monitoring (2020–2023).
Water clarity
Worsening4 years
Phosphorus
Worsening+1.5 µg/L/yr4 years
Nearby Lakes in Fremont County
Frequently asked questions about Boysen Reservoir Transitional Embayment
Where is Boysen Reservoir Transitional Embayment?
- Boysen Reservoir Transitional Embayment is a lake in Fremont County, Wyoming. Its water-quality measurements are published by Wyoming DEQ and shown on this page as reported.
What is the water quality of Boysen Reservoir Transitional Embayment?
- Boysen Reservoir Transitional Embayment in Fremont County, Wyoming has water-quality measurements published by Wyoming DEQ, shown here as reported. Water clarity: 11 ft visibility. Phosphorus: 10 µg/L.
Is Boysen Reservoir Transitional Embayment safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Boysen Reservoir Transitional Embayment across LakeQuality
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Where this data comes from
48 measurements from 1 monitoring station, 2020–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- State of Wyoming Department of Environmental Quality Watershed Program
WYDEQ_WATERSHED48 samples · 2020–2023
Analytical methods
- Secchi
- Total Phosphorus After Block Digestion
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.