Quail Creek Reservoir
Washington County, UtahView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
- Oligotrophic
- #3 of 10 in the county
- Limited data
Quail Creek Reservoir in Washington County, Utah has a water quality grade of A (Excellent). Water clarity: 14.6 ft visibility. Phosphorus: 6.1 µg/L. Chlorophyll-a (algae): 0.9 µg/L.
- Clarity
- 14.6 ft
- Type
- Oligotrophic
- Phosphorus
- 6.1 µg/L
- Chlorophyll-a
- 0.9 µg/L
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Watch Quail Creek Reservoir’s letter
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Quail Creek Reservoir is a cold, clear oligotrophic lake in Washington County, Utah. Water quality is graded A based on 2 sampling years through 2025. Compared to the 9 other monitored lakes in Washington County, Quail Creek Reservoir ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DWQ, last sampled 2025-08-20. Grade methodology: LakeQuality methodology.
What Quail Creek Reservoir is good for
From access and monitoring records, not editorial picks.
- Clear water14.6 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 14.6 ft. Phosphorus 6.1 µg/L. Chlorophyll-a 0.9 µg/L. TSI 33. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14.6 ft | Not graded |
| Phosphorus | 6.1 µg/L | Good |
| Chlorophyll-a (Algae) | 0.9 µg/L | Good |
| Trophic State Index (TSI) | 33 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Fishing Quail Creek Reservoir
Reservoir Info (USACE NID)
Quail Creek Reservoir is a man-made reservoir impounded by the Quail Creek (completed 1984), built primarily for irrigation on the Quail Creek & Pipeline; earth-type dam, 209 ft tall and 895 ft long.
- Normal storage
- 40,325 ac-ft
- Max storage
- 45,050 ac-ft
- Drainage area
- 78 sq mi
- Hazard class
- High
- Owner
- WASHINGTON COUNTY WATER CONSERVANCY DIST
Source: USACE National Inventory of Dams, NID ID UT00514 · Operator website
County Ranking
Ranked #3 of 10 lakes in Washington County
Nearby Lakes in Washington County
Frequently asked questions about Quail Creek Reservoir
Where is Quail Creek Reservoir?
- Quail Creek Reservoir is a lake in Washington County, Utah. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Quail Creek Reservoir?
- Quail Creek Reservoir in Washington County, Utah has a water quality grade of A (Excellent). Water clarity: 14.6 ft visibility. Phosphorus: 6.1 µg/L. Chlorophyll-a (algae): 0.9 µg/L.
Is Quail Creek Reservoir safe to swim in?
- The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Quail Creek Reservoir across LakeQuality
Depth, room, public access, and the state wake-sport rules
4 thermal springs within 6.7 mi, nearest Berry Springs
11.4 mi away · cable-pulled, no boat wake
Species activity outlook by water temperature and season
Where to stay at Utah's top lakes, each with its grade
Low nutrients, clear water. The letter is not a swimming clearance.
Utah's cleanest and most-polluted lakes, ranked
Planning a trip around Zion?
Quail Creek Reservoir is about 21 miles from Zion National Park. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Zion →More Utah Lake Rankings
Other Grade A Lakes in Utah
Oligotrophic Lakes in Utah
Where this data comes from
36 measurements from 2 monitoring stations, 2019–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Utah Department Of Environmental Quality
UTAHDWQ_WQX36 samples · 2019–2025
Analytical methods
- Field Measurements
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
Monitoring station identifiers (2)
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.