Long Park Reservoir
Daggett County, UtahView mapDirections
Not enough samples to grade — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. No letter yet. Here is what we do have.
- 45 ft max depth
- Public access
- Limited data
Long Park Reservoir in Daggett County, Utah is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 6.2 ft visibility. Phosphorus: 12.9 µg/L. Chlorophyll-a (algae): 6.1 µg/L.
- Clarity
- 6.2 ft
- Max depth
- ~45 ft est.
- Phosphorus
- 12.9 µg/L
- Chlorophyll-a
- 6.1 µg/L
- Trend
- → Stable
- Public access
- Yes
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Watch Long Park Reservoir’s letter
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Why Long Park Reservoir has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Long Park Reservoir, the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by Utah DWQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Long Park Reservoir is a lake in Daggett County, Utah with an estimated average depth of about 45 feet. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, Utah DWQ, last sampled 2023-08-15. Grade methodology: LakeQuality methodology.
What Long Park Reservoir is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Long Park Reservoir
These readings exist but are not enough for an A–F grade — see why.
Murky, only visible to about 6.2 ft. Phosphorus 12.9 µg/L. Chlorophyll-a 6.1 µg/L. TSI 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.2 ft | Not graded |
| Phosphorus | 12.9 µg/L | Not graded |
| Chlorophyll-a (Algae) | 6.1 µg/L | Not graded |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~45 ft est. |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Utah has not published bathymetry for Long Park Reservoir.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Recreation & Access
- Long Park ReservoirPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Long Park Reservoir
Water Quality Trend: → Stable
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.017 m/yr | 2 |
Reservoir Info (USACE NID)
Long Park Reservoir is a man-made reservoir impounded by the Long Park (Daggett) (completed 1980), built primarily for irrigation on the Sheep Creek; earth-type dam, 112 ft tall and 860 ft long.
- Normal storage
- 13,700 ac-ft
- Max storage
- 16,658 ac-ft
- Drainage area
- 2 sq mi
- Hazard class
- High
- Owner
- SHEEP CREEK IRRIGATION COMPANY
Source: USACE National Inventory of Dams, NID ID UT00365 · Operator website · Matched by proximity (0.42 km)
Graded lakes near Long Park Reservoir
Long Park Reservoir has no grade, but these lakes within a short drive do.
Nearby Lakes in Daggett County
Frequently asked questions about Long Park Reservoir
Where is Long Park Reservoir?
- Long Park Reservoir is a lake in Daggett County, Utah. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Long Park Reservoir?
- Long Park Reservoir in Daggett County, Utah is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 6.2 ft visibility. Phosphorus: 12.9 µg/L. Chlorophyll-a (algae): 6.1 µg/L.
Is Long Park Reservoir safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Long Park Reservoir?
- No published bathymetric survey covers Long Park Reservoir, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 45 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Are there boat ramps on Long Park Reservoir?
- Long Park Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Long Park Reservoir. Public access is listed as yes.
Explore Long Park Reservoir across LakeQuality
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Where this data comes from
22 measurements from 1 monitoring station, 2017–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Utah Department Of Environmental Quality
UTAHDWQ_WQX22 samples · 2017–2023
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory