Settlement Canyon Reservoir
Tooele County, UtahView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
↑ up from B at the last regrade
- Oligotrophic
- #1 of 4 in the county
- Limited data
Settlement Canyon Reservoir in Tooele County, Utah has a water quality grade of A (Excellent). Water clarity: 8.5 ft visibility. Phosphorus: 8.9 µg/L. Chlorophyll-a (algae): 1.6 µg/L.
- Clarity
- 8.5 ft
- Type
- Oligotrophic
- Phosphorus
- 8.9 µg/L
- Chlorophyll-a
- 1.6 µg/L
- Trend
- → Stable
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Watch Settlement Canyon Reservoir’s letter
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Settlement Canyon Reservoir is a cold, clear oligotrophic lake in Tooele County, Utah. Water quality is graded A based on 2 sampling years through 2024. Water clarity is improving over recent sampling years. Compared to the 3 other monitored lakes in Tooele County, Settlement Canyon Reservoir ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DWQ, last sampled 2024-09-03. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyLimited data
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 A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: A (Excellent)
Moderate clarity, visible to about 8.5 ft. Phosphorus 8.9 µg/L. Chlorophyll-a 1.6 µg/L. TSI 39. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8.5 ft | Not graded |
| Phosphorus | 8.9 µg/L | Good |
| Chlorophyll-a (Algae) | 1.6 µg/L | Good |
| Trophic State Index (TSI) | 39 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Fishing Settlement Canyon Reservoir
Water Quality Trend: → Stable
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.235 m/yr | 3 |
| Chlorophyll-a | ↓ Declining | +0.14 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Settlement Canyon Reservoir is a man-made reservoir impounded by the Settlement Canyon (completed 1966), built primarily for irrigation on the Settlement Creek; earth-type dam, 118 ft tall and 960 ft long.
- Normal storage
- 1,168 ac-ft
- Max storage
- 1,432 ac-ft
- Drainage area
- 17 sq mi
- Hazard class
- High
- Owner
- SETTLEMENT CANYON IRRIGATION COMPANY
Source: USACE National Inventory of Dams, NID ID UT00270 · Operator website
County Ranking
Ranked #1 of 4 lakes in Tooele County
Nearby Lakes in Tooele County
Frequently asked questions about Settlement Canyon Reservoir
Where is Settlement Canyon Reservoir?
- Settlement Canyon Reservoir is a lake in Tooele County, Utah. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Settlement Canyon Reservoir?
- Settlement Canyon Reservoir in Tooele County, Utah has a water quality grade of A (Excellent). Water clarity: 8.5 ft visibility. Phosphorus: 8.9 µg/L. Chlorophyll-a (algae): 1.6 µg/L.
Is Settlement Canyon Reservoir safe to swim in?
- The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Settlement Canyon Reservoir across LakeQuality
4 thermal springs within 20 mi, nearest Morgans Warm 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 A Lakes in Utah
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Where this data comes from
35 measurements from 1 monitoring station, 2012–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Utah Department Of Environmental Quality
UTAHDWQ_WQX35 samples · 2012–2024
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.