Three Creeks Reservoir
Beaver County, UtahView mapDirections
Nutrients and algae sit mid-range for this region.
↓ down from B at the last regrade
- Mesotrophic
- Impaired · pH / acidity
- #3 of 7 in the county
- Limited data
Three Creeks Reservoir in Beaver County, Utah has a water quality grade of C (Fair). Water clarity: 6.6 ft visibility. Phosphorus: 32.5 µg/L. Chlorophyll-a (algae): 3.7 µg/L.
- Clarity
- 6.6 ft
- Type
- Mesotrophic
- Phosphorus
- 32.5 µg/L
- Chlorophyll-a
- 3.7 µg/L
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Watch Three Creeks Reservoir’s letter
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Three Creeks Reservoir is a mesotrophic lake in Beaver County, Utah. Water quality is graded C based on 1 sampling years through 2020. 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. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The C is nutrients and algae, 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.
Water Quality Grade: C (Fair)
Murky, only visible to about 6.6 ft. Phosphorus 32.5 µg/L. Chlorophyll-a 3.7 µg/L. TSI 49. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.6 ft | Not graded |
| Phosphorus | 32.5 µg/L | Fair |
| Chlorophyll-a (Algae) | 3.7 µg/L | Not graded |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
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
Source: EPA ATTAINS assessment unit UT-L-16030007-025_00 · Official waterbody report
County Ranking
Ranked #3 of 7 lakes in Beaver County
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. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Three Creeks Reservoir?
- Three Creeks Reservoir in Beaver County, Utah has a water quality grade of C (Fair). 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?
- The C is nutrients and algae, 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
2 thermal springs within 24.8 mi, nearest Sulphurdale
Species activity outlook by water temperature and season
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Moderate nutrients, good water quality
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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)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database