Blacks Fork Lake
Sweetwater County, WyomingView mapDirections
Wyoming DEQ publishes the water-quality measurements for Blacks Fork Lake. Here is what has been measured.
- Limited data
Blacks Fork Lake in Sweetwater County, Wyoming has water-quality measurements published by Wyoming DEQ, shown here as reported. Water clarity: 8.5 ft visibility.
Blacks Fork Lake is a lake in Sweetwater County, Wyoming. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2016-07-05. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Blacks Fork Lake 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 Blacks Fork Lake
These are the measurements Wyoming DEQ publishes for Blacks Fork Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 8.5 ft. TSI 46.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 8.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| 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. | 46 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
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Fishing Blacks Fork Lake
Water Quality Trend: Improving
Based on 10 years of monitoring (2012–2025).
Water clarity
Improving9 years
Phosphorus
Improving-1.21 µg/L/yr10 years
Chlorophyll-a
Improving-0.2 µg/L/yr4 years
Nearby Lakes in Sweetwater County
Frequently asked questions about Blacks Fork Lake
Where is Blacks Fork Lake?
- Blacks Fork Lake is a lake in Sweetwater County, Wyoming. Its water-quality measurements are published by Wyoming DEQ and shown on this page as reported.
What is the water quality of Blacks Fork Lake?
- Blacks Fork Lake in Sweetwater County, Wyoming has water-quality measurements published by Wyoming DEQ, shown here as reported. Water clarity: 8.5 ft visibility.
Is Blacks Fork Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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Where this data comes from
13 measurements from 1 monitoring station, 2012–2016. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- UC Region of USBOR
UC_REGION_USBOR_WQX13 samples · 2012–2016
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.