Three Creeks Reservoir
Beaver County, UtahView mapDirections
Utah DWQ publishes the water-quality measurements for Three Creeks Reservoir. Here is what has been measured.
- Mesotrophic
- Impaired · pH / acidity
- Limited data
Three Creeks Reservoir in Beaver County, Utah has water-quality measurements published by Utah DWQ, shown here as reported. Water clarity: 6.6 ft visibility. Phosphorus: 32.5 µg/L. Chlorophyll-a (algae): 3.7 µg/L.
Three Creeks Reservoir is a mesotrophic lake in Beaver County, Utah. Compared to the 6 other monitored lakes in Beaver County, Three Creeks Reservoir ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DWQ, last sampled 2020-06-23. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLimited data
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. Three Creeks Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for pH / acidity. Check local advisories before you swim.
Whether Three Creeks Reservoir is safe to swim in today is a call for the Utah Division of Water Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Three Creeks Reservoir
These are the measurements Utah DWQ publishes for Three Creeks Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 6.6 ft. Phosphorus 32.5 µg/L. Chlorophyll-a 3.7 µg/L. TSI 49.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 6.6ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 32.5µg/L | Fair GoodFairPoor |
| Chlorophyll-a (algae) | 3.7µg/L | Measured, not scored 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. | 49 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
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Answers come straight from the public measurements and survey records on this page.
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Fishing Three Creeks Reservoir
Reservoir Info (USACE NID)
Three Creeks Reservoir is a man-made reservoir impounded by the Three Creeks (Beaver) (completed 1949), built primarily for irrigation on the Beaver River; earth-type dam, 105 ft tall and 347 ft long.
- Normal storage
- 2,024 ac-ft
- Max storage
- 2,430 ac-ft
- Drainage area
- 12 sq mi
- Hazard class
- High
- Owner
- KENT`S LAKE IRRIGATION COMPANY
Source: USACE National Inventory of Dams, NID ID UT00298 · Operator website · Matched by proximity (0.26 km)
EPA Impairment Status
Three Creeks Reservoir is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life.
Source: EPA ATTAINS assessment unit UT-L-16030007-025_00 · Official waterbody report
Nearby Lakes in Beaver County
Frequently asked questions about Three Creeks Reservoir
Where is Three Creeks Reservoir?
- Three Creeks Reservoir is a lake in Beaver County, Utah. Its water-quality measurements are published by Utah DWQ and shown on this page as reported.
What is the water quality of Three Creeks Reservoir?
- Three Creeks Reservoir in Beaver County, Utah has water-quality measurements published by Utah DWQ, shown here as reported. Water clarity: 6.6 ft visibility. Phosphorus: 32.5 µg/L. Chlorophyll-a (algae): 3.7 µg/L.
Is Three Creeks Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Three Creeks Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for pH / acidity. Check local advisories before you swim.
Explore Three Creeks Reservoir across LakeQuality
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Where this data comes from
8 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Utah Department Of Environmental Quality
UTAHDWQ_WQX8 samples · 2020
Analytical methods
- Field Measurements
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database