Jordanelle Reservoir
Wasatch County, UtahView mapDirections
Utah DWQ publishes the water-quality measurements for Jordanelle Reservoir. Here is what has been measured.
- Oligotrophic
Jordanelle Reservoir in Wasatch County, Utah has water-quality measurements published by Utah DWQ, shown here as reported. Water clarity: 8.2 ft visibility. Phosphorus: 20 µg/L. Chlorophyll-a (algae): 1.9 µg/L.
Jordanelle Reservoir is a cold, clear oligotrophic lake in Wasatch County, Utah. Overall water quality is declining over recent sampling years. Compared to the 15 other monitored lakes in Wasatch County, Jordanelle Reservoir ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DWQ, last sampled 2025-08-13. Methodology: how these readings are compared.
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Swimming conditions
Readings onlyModerate algae
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. Check local advisories before you swim.
Whether Jordanelle 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 Jordanelle Reservoir
These are the measurements Utah DWQ publishes for Jordanelle Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 8.2 ft. Phosphorus 20 µg/L. Chlorophyll-a 1.9 µg/L. TSI 44.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 8.2ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 20µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 1.9µg/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. | 44 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Jordanelle Reservoir
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Fishing Jordanelle Reservoir
Water Quality Trend: Worsening
Based on 14 years of monitoring (2012–2025).
Water clarity
Stable14 years
Phosphorus
Worsening+1.14 µg/L/yr6 years
Chlorophyll-a
Stable+0.01 µg/L/yr12 years
Reservoir Info (USACE NID)
Jordanelle Reservoir is a man-made reservoir impounded by the Jordanelle Dam (completed 1993), built primarily for water supply on the Provo; earth-type dam, 391 ft tall and 3,820 ft long.
- Normal storage
- 0 ac-ft
- Max storage
- 363,354 ac-ft
- Drainage area
- 261.19 sq mi
- Hazard class
- High
- Owner
- DEPARTMENT OF THE INTERIOR
Source: USACE National Inventory of Dams, NID ID UT10204 · Operator website
Nearby Lakes in Wasatch County
Frequently asked questions about Jordanelle Reservoir
Where is Jordanelle Reservoir?
- Jordanelle Reservoir is a lake in Wasatch County, Utah. Its water-quality measurements are published by Utah DWQ and shown on this page as reported.
What is the water quality of Jordanelle Reservoir?
- Jordanelle Reservoir in Wasatch County, Utah has water-quality measurements published by Utah DWQ, shown here as reported. Water clarity: 8.2 ft visibility. Phosphorus: 20 µg/L. Chlorophyll-a (algae): 1.9 µg/L.
Is Jordanelle Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Jordanelle Reservoir across LakeQuality
Depth, room, public access, and the state wake-sport rules
4 thermal springs within 6.6 mi, nearest Warm Ditch Spring
Species activity outlook by water temperature and season
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Where this data comes from
1,972 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_WQX1,972 samples · 2012–2025
Analytical methods
- Field Measurements
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- Metals in Water by ICP-AES
- 447.0 ~ EPA; Chlorophyll a and b in phytoplankton by HPLC/UV
- 10200 H ~ Chlorophyll a-b-c Determination
- Turbidiy determined in the field
- Turbidity by Nephelometry
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.