Scofield Reservoir
Carbon County, Utah2,810 acresView mapDirections
Nutrients and algae run above the regional average.
↓ down from B at the last regrade
- Eutrophic
- Impaired · Algal growth
- #4 of 4 in the county
- Limited data
Scofield Reservoir in Carbon County, Utah has a water quality grade of D (Nutrient-rich). Water clarity: 12.5 ft visibility. Phosphorus: 26.3 µg/L. Chlorophyll-a (algae): 7.6 µg/L. Surface area: 2810 acres.
- Clarity
- 12.5 ft
- Area
- 2,810 acres
- Type
- Eutrophic
- Phosphorus
- 26.3 µg/L
- Chlorophyll-a
- 7.6 µg/L
- Trend
- ↑ Improving
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Stays near Scofield Reservoir
Compare lakeside cabins, hotels, and vacation rentals near Scofield Reservoir in Carbon County, Utah — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Scofield Reservoir are listed below.
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Watch Scofield Reservoir’s letter
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Scofield Reservoir is a 2,810-acre productive, nutrient-rich eutrophic lake in Carbon County, Utah. Water quality is graded D based on 2 sampling years through 2020. Overall water quality is improving over recent sampling years. Compared to the 3 other monitored lakes in Carbon County, Scofield Reservoir ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DWQ, last sampled 2020-09-10. Grade methodology: LakeQuality methodology.
What Scofield Reservoir is good for
From access and monitoring records, not editorial picks.
- Clear water12.5 ft of visibility
- Big water2,810 acres
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 D is nutrients and algae, not a swimming clearance. Scofield Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, nutrients (phosphorus, nitrogen), oxygen depletion (low DO), pH / acidity. Check local advisories before you swim.
Water Quality Grade: D (Nutrient-rich)
Good clarity, visible to about 12.5 ft. Phosphorus 26.3 µg/L. Chlorophyll-a 7.6 µg/L. TSI 48. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 12.5 ft | Not graded |
| Phosphorus | 26.3 µg/L | Fair |
| Chlorophyll-a (Algae) | 7.6 µg/L | Poor |
| Trophic State Index (TSI) | 48 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 2,810 acres |
No bathymetric survey has been published for Scofield Reservoir, so its depth is not documented here.
Fishing Scofield Reservoir
Water Quality Trend: ↑ Improving
Based on 10 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.299 m/yr | 10 |
| Phosphorus | ↓ Declining | +8.42 µg/L/yr | 4 |
| Chlorophyll-a | ↑ Improving | -3.09 µg/L/yr | 5 |
Reservoir Info (USACE NID)
Scofield Reservoir is a man-made reservoir impounded by the Scofield Dam (completed 1946), built primarily for irrigation on the Price River; earth-type dam, 125 ft tall and 575 ft long.
- Surface area
- 2,810 ac
- Normal storage
- 73,600 ac-ft
- Max storage
- 73,600 ac-ft
- Drainage area
- 156.18 sq mi
- Hazard class
- High
- Owner
- BUREAU OF RECLAMATION
Source: USACE National Inventory of Dams, NID ID UT10133 · Operator website
EPA Impairment Status
Scofield Reservoir is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit UT-L-14060007-005_00 · Official waterbody report
County Ranking
Ranked #4 of 4 lakes in Carbon County
Nearby Lakes in Carbon County
Frequently asked questions about Scofield Reservoir
Where is Scofield Reservoir?
- Scofield Reservoir is a lake in Carbon County, Utah. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Scofield Reservoir?
- Scofield Reservoir in Carbon County, Utah has a water quality grade of D (Nutrient-rich). Water clarity: 12.5 ft visibility. Phosphorus: 26.3 µg/L. Chlorophyll-a (algae): 7.6 µg/L. Surface area: 2810 acres.
Is Scofield Reservoir safe to swim in?
- The D is nutrients and algae, not a swimming clearance. Scofield Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, nutrients (phosphorus, nitrogen), oxygen depletion (low DO), pH / acidity. Check local advisories before you swim.
Explore Scofield Reservoir across LakeQuality
More Utah Lake Rankings
Other Grade D Lakes in Utah
Eutrophic Lakes in Utah
Where this data comes from
85 measurements from 1 monitoring station, 2013–2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Utah Department Of Environmental Quality
UTAHDWQ_WQX85 samples · 2013–2020
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