Jordanelle Reservoir
Wasatch County, UtahView mapDirections
Nutrients and algae sit mid-range for this region.
↓ down from B at the last regrade
- Oligotrophic
- #2 of 16 in the county
Jordanelle Reservoir in Wasatch County, Utah has a water quality grade of C (Fair). Water clarity: 8.2 ft visibility. Phosphorus: 20 µg/L. Chlorophyll-a (algae): 1.9 µg/L.
- Clarity
- 8.2 ft
- Type
- Oligotrophic
- Phosphorus
- 20 µg/L
- Chlorophyll-a
- 1.9 µg/L
- Trend
- ↓ Declining
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Watch Jordanelle Reservoir’s letter
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Jordanelle Reservoir is a cold, clear oligotrophic lake in Wasatch County, Utah. Water quality is graded C based on 2 sampling years through 2025. 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. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyModerate
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 C is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: C (Fair)
Moderate clarity, visible to about 8.2 ft. Phosphorus 20 µg/L. Chlorophyll-a 1.9 µg/L. TSI 44. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8.2 ft | Not graded |
| Phosphorus | 20 µg/L | Good |
| Chlorophyll-a (Algae) | 1.9 µg/L | Fair |
| Trophic State Index (TSI) | 44 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Fishing Jordanelle Reservoir
Water Quality Trend: ↓ Declining
Based on 14 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.046 m/yr | 14 |
| Phosphorus | ↓ Declining | +1.14 µg/L/yr | 6 |
| Chlorophyll-a | → Stable | +0.01 µg/L/yr | 12 |
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
County Ranking
Ranked #2 of 16 lakes in Wasatch County
Nearby Lakes in Wasatch County
Frequently asked questions about Jordanelle Reservoir
Where is Jordanelle Reservoir?
- Jordanelle Reservoir is a lake in Wasatch County, Utah. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Jordanelle Reservoir?
- Jordanelle Reservoir in Wasatch County, Utah has a water quality grade of C (Fair). Water clarity: 8.2 ft visibility. Phosphorus: 20 µg/L. Chlorophyll-a (algae): 1.9 µg/L.
Is Jordanelle Reservoir safe to swim in?
- The C is nutrients and algae, 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
Where to stay at Utah's top lakes, each with its grade
Low nutrients, clear water. The letter is not a swimming clearance.
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Other Grade C Lakes in Utah
Oligotrophic Lakes in Utah
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)
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.