Dmad Reservoir N of Cut
Millard County, UtahView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
↑ up from C at the last regrade
- Mesotrophic
- #1 of 3 in the county
- Limited data
Dmad Reservoir N of Cut in Millard County, Utah has a water quality grade of A (Excellent). Water clarity: 0.7 ft visibility. Phosphorus: 41 µg/L. Chlorophyll-a (algae): 4.3 µg/L.
- Clarity
- 0.7 ft
- Type
- Mesotrophic
- Phosphorus
- 41 µg/L
- Chlorophyll-a
- 4.3 µg/L
- Trend
- ↓ Declining
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Watch Dmad Reservoir N of Cut’s letter
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Dmad Reservoir N of Cut is a mesotrophic lake in Millard County, Utah. Water quality is graded A based on 1 sampling years through 2020. Overall water quality is declining over recent sampling years. Compared to the 2 other monitored lakes in Millard County, Dmad Reservoir N of Cut ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DWQ, last sampled 2020-08-05. 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 A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: A (Excellent)
Very murky, less than 0.7 ft of visibility. Phosphorus 41 µg/L. Chlorophyll-a 4.3 µg/L. TSI 62. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.7 ft | Not graded |
| Phosphorus | 41 µg/L | Not graded |
| Chlorophyll-a (Algae) | 4.3 µg/L | Good |
| Trophic State Index (TSI) | 62 | Mesotrophic |
Moderate nutrients, good water quality
Fishing Dmad Reservoir N of Cut
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.133 m/yr | 2 |
Reservoir Info (USACE NID)
Dmad Reservoir N of Cut is a man-made reservoir impounded by the Dmad (completed 1959), built primarily for irrigation on the Sevier River; earth-type dam, 37 ft tall and 1,200 ft long.
- Normal storage
- 7,735 ac-ft
- Max storage
- 21,887 ac-ft
- Drainage area
- 7,270 sq mi
- Hazard class
- High
- Owner
- DMAD COMPANY
Source: USACE National Inventory of Dams, NID ID UT00080 · Operator website · Matched by proximity (0.79 km)
County Ranking
Ranked #1 of 3 lakes in Millard County
Nearby Lakes in Millard County
Frequently asked questions about Dmad Reservoir N of Cut
Where is Dmad Reservoir N of Cut?
- Dmad Reservoir N of Cut is a lake in Millard County, Utah. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Dmad Reservoir N of Cut?
- Dmad Reservoir N of Cut in Millard County, Utah has a water quality grade of A (Excellent). Water clarity: 0.7 ft visibility. Phosphorus: 41 µg/L. Chlorophyll-a (algae): 4.3 µg/L.
Is Dmad Reservoir N of Cut safe to swim in?
- The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Dmad Reservoir N of Cut across LakeQuality
2 thermal springs within 22.8 mi, nearest Baker (Abraham, Crater) Hot Springs
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
14 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_WQX14 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.