Long Park Reservoir
Daggett County, UtahView mapDirections
Utah DWQ publishes the water-quality measurements for Long Park Reservoir. Here is what has been measured.
- 45 ft max depth
- Public access
- Limited data
Long Park Reservoir in Daggett County, Utah has water-quality measurements published by Utah DWQ, shown here as reported. Water clarity: 6.2 ft visibility. Phosphorus: 12.9 µg/L. Chlorophyll-a (algae): 6.1 µg/L.
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. Methodology: how these readings are compared.
What Long Park Reservoir is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Long Park Reservoir is safe to swim in today is a call for the Utah Division of Water Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Long Park Reservoir
These are the measurements Utah DWQ publishes for Long Park Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 6.2 ft. Phosphorus 12.9 µg/L. Chlorophyll-a 6.1 µg/L. TSI 47.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 6.2ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 12.9µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 6.1µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 47 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Long Park Reservoir
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~45 ft est.
Public access
Yes
Listed by Utah DWQ
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
Watershed (drainage) area
2 sq mi
HydroLAKES / HydroSHEDS
Surface area
183 acres
HydroLAKES / HydroSHEDS
Shoreline
2.7 mi
HydroLAKES / HydroSHEDS
Elevation
8,609 ft
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
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Stays near Long Park Reservoir
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Fishing Long Park Reservoir
Water quality readings over time
2 seasons of samples on record (2017–2023). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Stable2 years
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)
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. Its water-quality measurements are published by Utah DWQ and shown on this page as reported.
What is the water quality of Long Park Reservoir?
- Long Park Reservoir in Daggett County, Utah has water-quality measurements published by Utah DWQ, shown here as reported. 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?
- Nutrient and algae readings are 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.
Can I fish at Long Park Reservoir?
- Long Park Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Utah's fish and wildlife agency, so check its current regulations before you go.
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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from 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