Wide Hollow Reservoir
Garfield County, UtahView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
- Mesotrophic
- Impaired · Oxygen depletion (low DO)
- #1 of 10 in the county
- Public access
Wide Hollow Reservoir in Garfield County, Utah has a water quality grade of A (Excellent). Water clarity: 13.8 ft visibility. Phosphorus: 36.5 µg/L. Chlorophyll-a (algae): 3.4 µg/L.
- Clarity
- 13.8 ft
- Type
- Mesotrophic
- Phosphorus
- 36.5 µg/L
- Chlorophyll-a
- 3.4 µg/L
- Trend
- ↓ Declining
- Public access
- Yes
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Watch Wide Hollow Reservoir’s letter
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Wide Hollow Reservoir is a mesotrophic lake in Garfield County, Utah. Water quality is graded A based on 2 sampling years through 2025. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 9 other monitored lakes in Garfield County, Wide Hollow Reservoir ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DWQ, last sampled 2025-09-02. Grade methodology: LakeQuality methodology.
What Wide Hollow Reservoir is good for
From access and monitoring records, not editorial picks.
- Clear water13.8 ft of visibility
- Boat launch1 documented ramp
Swimming Safety
Grade onlyLow algae
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. Wide Hollow Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for oxygen depletion (low DO), pH / acidity, temperature. Check local advisories before you swim.
Water Quality Grade: A (Excellent)
Good clarity, visible to about 13.8 ft. Phosphorus 36.5 µg/L. Chlorophyll-a 3.4 µg/L. TSI 46. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 13.8 ft | Not graded |
| Phosphorus | 36.5 µg/L | Good |
| Chlorophyll-a (Algae) | 3.4 µg/L | Good |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Wide Hollow ReservoirPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Wide Hollow Reservoir
Water Quality Trend: ↓ Declining
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.092 m/yr | 6 |
| Phosphorus | ↓ Declining | +4.38 µg/L/yr | 2 |
| Chlorophyll-a | ↓ Declining | +0.16 µg/L/yr | 4 |
Reservoir Info (USACE NID)
Wide Hollow Reservoir is a man-made reservoir impounded by the Wide Hollow (completed 1954), built primarily for irrigation on the Escalante River--Offstream; earth-type dam, 51 ft tall and 2,300 ft long.
- Normal storage
- 2,722 ac-ft
- Max storage
- 3,701 ac-ft
- Drainage area
- 10 sq mi
- Hazard class
- High
- Owner
- NEW ESCALANTE IRRIGATION COMPANY
Source: USACE National Inventory of Dams, NID ID UT00325 · Operator website
EPA Impairment Status
Wide Hollow Reservoir is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit UT-L-14070005-011_00 · Official waterbody report
County Ranking
Ranked #1 of 10 lakes in Garfield County
Nearby Lakes in Garfield County
Frequently asked questions about Wide Hollow Reservoir
Where is Wide Hollow Reservoir?
- Wide Hollow Reservoir is a lake in Garfield County, Utah. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Wide Hollow Reservoir?
- Wide Hollow Reservoir in Garfield County, Utah has a water quality grade of A (Excellent). Water clarity: 13.8 ft visibility. Phosphorus: 36.5 µg/L. Chlorophyll-a (algae): 3.4 µg/L.
Is Wide Hollow Reservoir safe to swim in?
- The A is nutrients and algae, not a swimming clearance. Wide Hollow Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for oxygen depletion (low DO), pH / acidity, temperature. Check local advisories before you swim.
How deep is Wide Hollow Reservoir?
- The available depth estimate for Wide Hollow Reservoir is shallower than its measured water clarity, which cannot be right, so no depth is shown.
Are there boat ramps on Wide Hollow Reservoir?
- Wide Hollow Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Wide Hollow Reservoir. Public access is listed as yes.
Explore Wide Hollow Reservoir across LakeQuality
2 documented falls within 12.1 mi, nearest Upper Calf Creek Falls
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
Utah's cleanest and most-polluted lakes, ranked
Planning a trip around Bryce Canyon?
Wide Hollow Reservoir is about 33 miles from Bryce Canyon 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 Bryce Canyon →More Utah Lake Rankings
Other Grade A Lakes in Utah
Mesotrophic Lakes in Utah
Where this data comes from
51 measurements from 1 monitoring station, 2012–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Utah Department Of Environmental Quality
UTAHDWQ_WQX51 samples · 2012–2025
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory