Minersville Reservoir
Beaver County, UtahView mapDirections
Nutrients and algae sit mid-range for this region.
- Mesotrophic
- Impaired · Nutrients (phosphorus, nitrogen)
- #1 of 7 in the county
- Public access
- Limited data
Minersville Reservoir in Beaver County, Utah has a water quality grade of C (Fair). Water clarity: 2.6 ft visibility. Phosphorus: 99 µg/L. Chlorophyll-a (algae): 4.6 µg/L.
- Clarity
- 2.6 ft
- Type
- Mesotrophic
- Phosphorus
- 99 µg/L
- Chlorophyll-a
- 4.6 µg/L
- Trend
- ↑ Improving
- Public access
- Yes
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Watch Minersville Reservoir’s letter
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Minersville Reservoir is a mesotrophic lake in Beaver County, Utah. Water quality is graded C based on 2 sampling years through 2020. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 6 other monitored lakes in Beaver County, Minersville Reservoir ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DWQ, last sampled 2020-08-10. Grade methodology: LakeQuality methodology.
What Minersville Reservoir is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
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. Minersville Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen), oxygen depletion (low DO), pH / acidity, temperature. Check local advisories before you swim.
Water Quality Grade: C (Fair)
Very murky, less than 2.6 ft of visibility. Phosphorus 99 µg/L. Chlorophyll-a 4.6 µg/L. TSI 60. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.6 ft | Not graded |
| Phosphorus | 99 µg/L | Poor |
| Chlorophyll-a (Algae) | 4.6 µg/L | Good |
| Trophic State Index (TSI) | 60 | Mesotrophic |
Moderate nutrients, good water quality
Recreation & Access
- Minersville ReservoirPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Minersville Reservoir
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.233 m/yr | 2 |
Reservoir Info (USACE NID)
Minersville Reservoir is a man-made reservoir impounded by the Rocky Ford (Beaver) (completed 1914), built primarily for irrigation on the Beaver River; earth-type dam, 68 ft tall and 1,575 ft long.
- Normal storage
- 14,129 ac-ft
- Max storage
- 38,733 ac-ft
- Drainage area
- 531 sq mi
- Hazard class
- High
- Owner
- ROCKY FORD IRRIGATION COMPANY
Source: USACE National Inventory of Dams, NID ID UT00259 · Operator website · Matched by proximity (0.12 km)
EPA Impairment Status
Minersville Reservoir is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit UT-L-16030007-011_00 · Official waterbody report
County Ranking
Ranked #1 of 7 lakes in Beaver County
Nearby Lakes in Beaver County
Frequently asked questions about Minersville Reservoir
Where is Minersville Reservoir?
- Minersville 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 Minersville Reservoir?
- Minersville Reservoir in Beaver County, Utah has a water quality grade of C (Fair). Water clarity: 2.6 ft visibility. Phosphorus: 99 µg/L. Chlorophyll-a (algae): 4.6 µg/L.
Is Minersville Reservoir safe to swim in?
- The C is nutrients and algae, not a swimming clearance. Minersville Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen), oxygen depletion (low DO), pH / acidity, temperature. Check local advisories before you swim.
Are there boat ramps on Minersville Reservoir?
- Minersville Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Minersville Reservoir. Public access is listed as yes.
Explore Minersville Reservoir across LakeQuality
4 thermal springs within 5.7 mi, nearest Dotsons (Radium) Warm Spring
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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Other Grade C Lakes in Utah
Mesotrophic Lakes in Utah
Where this data comes from
20 measurements from 1 monitoring station, 2014–2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Utah Department Of Environmental Quality
UTAHDWQ_WQX20 samples · 2014–2020
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
Named boat-access points from the USGS National Boat Ramps inventory