Upper Enterprise Reservoir
Washington County, UtahView mapDirections
Utah DWQ publishes the water-quality measurements for Upper Enterprise Reservoir. Here is what has been measured.
- Mesotrophic
- Impaired · Oxygen depletion (low DO)
- Limited data
Upper Enterprise Reservoir in Washington County, Utah has water-quality measurements published by Utah DWQ, shown here as reported. Water clarity: 5.2 ft visibility. Phosphorus: 35 µg/L. Chlorophyll-a (algae): 6.4 µg/L.
Upper Enterprise Reservoir is a mesotrophic lake in Washington County, Utah. Overall water quality is declining over recent sampling years. Compared to the 9 other monitored lakes in Washington County, Upper Enterprise Reservoir ranks #7 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DWQ, last sampled 2021-06-23. Methodology: how these readings are compared.
For a place on the water, look through cabin and lake-house rentals near Upper Enterprise Reservoir on Vrbo. For a hotel or motel room, Booking.com and Expedia both search around the lake.
What Upper Enterprise Reservoir is good for
From access and monitoring records, not editorial picks.
- Camping1 public campground nearby
Swimming conditions
Readings onlyLimited data
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Upper Enterprise 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.
Whether Upper Enterprise 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 Upper Enterprise Reservoir
These are the measurements Utah DWQ publishes for Upper Enterprise 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 5.2 ft. Phosphorus 35 µg/L. Chlorophyll-a 6.4 µg/L. TSI 52.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 5.2ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 35µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 6.4µg/L | Fair GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 52 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Upper Enterprise Reservoir
Answers come straight from the public measurements and survey records on this page.
Recreation & Access
Public campgrounds near Upper Enterprise Reservoir
- Honeycomb Rocks Campground0.4 km
Nearest public campgrounds in the USGS National Map inventory, within about 3 miles. An empty list means USGS records no campground that close, which is not the same as camping being unavailable. Where the source gives an official reservation link, it is used; the cabin and hotel search does not cover campsites. More camping lakes
Stays via Stay22
Stays near Upper Enterprise Reservoir
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Top-rated places to stay near Upper Enterprise Reservoir
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Fishing Upper Enterprise Reservoir
Water Quality Trend: Worsening
Based on 7 years of monitoring (2012–2021).
Water clarity
Improving6 years
Phosphorus
Worsening+1.3 µg/L/yr3 years
Chlorophyll-a
Worsening+0.31 µg/L/yr3 years
Reservoir Info (USACE NID)
Upper Enterprise Reservoir is a man-made reservoir impounded by the Enterprise (Upper) (completed 1912), built primarily for irrigation on the Little Pine Creek; earth-type dam, 91 ft tall and 190 ft long.
- Normal storage
- 8,690 ac-ft
- Max storage
- 12,300 ac-ft
- Drainage area
- 29.1 sq mi
- Hazard class
- High
- Owner
- ENTERPRISE RESERVOIR & CANAL COMPANY
Source: USACE National Inventory of Dams, NID ID UT00309 · Operator website · Matched by proximity (0.3 km)
EPA Impairment Status
Upper Enterprise Reservoir is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life.
Source: EPA ATTAINS assessment unit UT-L-16030006-002_00 · Official waterbody report
Nearby Lakes in Washington County
Frequently asked questions about Upper Enterprise Reservoir
Where is Upper Enterprise Reservoir?
- Upper Enterprise Reservoir is a lake in Washington County, Utah. Its water-quality measurements are published by Utah DWQ and shown on this page as reported.
What is the water quality of Upper Enterprise Reservoir?
- Upper Enterprise Reservoir in Washington County, Utah has water-quality measurements published by Utah DWQ, shown here as reported. Water clarity: 5.2 ft visibility. Phosphorus: 35 µg/L. Chlorophyll-a (algae): 6.4 µg/L.
Is Upper Enterprise Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Upper Enterprise 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.
Are there campgrounds on Upper Enterprise Reservoir?
- Upper Enterprise Reservoir has 1 public campground from USGS The National Map within 5 km, including Honeycomb Rocks Campground. This is a location join, not a booking. Cabins and hotels are listed separately; campsite reservations use the official link when the source provides one.
Explore Upper Enterprise Reservoir across LakeQuality
2 thermal springs within 16.4 mi, nearest Veyo Hot Spring
Species activity outlook by water temperature and season
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Where this data comes from
72 measurements from 1 monitoring station, 2013–2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Utah Department Of Environmental Quality
UTAHDWQ_WQX72 samples · 2013–2021
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
Impairment status from EPA ATTAINS 303(d) database
Public campgrounds from USGS The National Map Structures, within about 3 miles