Red Creek Reservoir
Duchesne County, UtahView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
- Mesotrophic
- #4 of 9 in the county
- Limited data
Red Creek Reservoir in Duchesne County, Utah has a water quality grade of A (Excellent). Water clarity: 14.4 ft visibility. Phosphorus: 26.5 µg/L. Chlorophyll-a (algae): 2.9 µg/L.
- Clarity
- 14.4 ft
- Type
- Mesotrophic
- Phosphorus
- 26.5 µg/L
- Chlorophyll-a
- 2.9 µg/L
- Trend
- ↓ Declining
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Watch Red Creek Reservoir’s letter
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Red Creek Reservoir is a mesotrophic lake in Duchesne County, Utah. Water quality is graded A based on 2 sampling years through 2023. Overall water quality is declining over recent sampling years. Compared to the 8 other monitored lakes in Duchesne County, Red Creek Reservoir ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DWQ, last sampled 2023-09-07. Grade methodology: LakeQuality methodology.
What Red Creek Reservoir is good for
From access and monitoring records, not editorial picks.
- Clear water14.4 ft of visibility
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 A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: A (Excellent)
Good clarity, visible to about 14.4 ft. Phosphorus 26.5 µg/L. Chlorophyll-a 2.9 µg/L. TSI 44. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14.4 ft | Not graded |
| Phosphorus | 26.5 µg/L | Good |
| Chlorophyll-a (Algae) | 2.9 µg/L | Good |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Fishing Red Creek Reservoir
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.3 m/yr | 2 |
Reservoir Info (USACE NID)
Red Creek Reservoir is a man-made reservoir impounded by the Red Creek (Duchesne) (completed 1960), built primarily for irrigation on the Red Creek; earth-type dam, 107 ft tall and 1,750 ft long.
- Normal storage
- 5,720 ac-ft
- Max storage
- 6,565 ac-ft
- Drainage area
- 22 sq mi
- Hazard class
- High
- Owner
- RED CREEK IRRIGATION COMPANY
Source: USACE National Inventory of Dams, NID ID UT00254 · Operator website · Matched by proximity (0.24 km)
County Ranking
Ranked #4 of 9 lakes in Duchesne County
Nearby Lakes in Duchesne County
Frequently asked questions about Red Creek Reservoir
Where is Red Creek Reservoir?
- Red Creek Reservoir is a lake in Duchesne County, Utah. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Red Creek Reservoir?
- Red Creek Reservoir in Duchesne County, Utah has a water quality grade of A (Excellent). Water clarity: 14.4 ft visibility. Phosphorus: 26.5 µg/L. Chlorophyll-a (algae): 2.9 µg/L.
Is Red Creek Reservoir safe to swim in?
- The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
How deep is Red Creek Reservoir?
- The available depth estimate for Red Creek Reservoir is shallower than its measured water clarity, which cannot be right, so no depth is shown.
Explore Red Creek Reservoir across LakeQuality
9.9 mi away · recorded at 79°F
Species activity outlook by water temperature and season
Where to stay at Utah's top lakes, each with its grade
Moderate nutrients, good water quality
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Where this data comes from
29 measurements from 1 monitoring station, 2017–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Utah Department Of Environmental Quality
UTAHDWQ_WQX29 samples · 2017–2023
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
Lake size & watershed from HydroLAKES (HydroSHEDS)