Manning Creek Lake
Piute County, UtahView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- Impaired · Algal growth
- Limited data
Manning Creek Lake in Piute County, Utah is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 59 µg/L. Chlorophyll-a (algae): 1.9 µg/L.
- Phosphorus
- 59 µg/L
- Chlorophyll-a
- 1.9 µg/L
- Trend
- ↑ Improving
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Watch Manning Creek Lake’s letter
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Why Manning Creek Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Manning Creek Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus and algae (chlorophyll-a), but not water clarity.
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by Utah DWQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Manning Creek Lake is a lake in Piute County, Utah. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, Utah DWQ, last sampled 2020-09-02. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Manning Creek Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, nutrients (phosphorus, nitrogen), pH / acidity. Check local advisories before you swim.
Water quality measurements for Manning Creek Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 59 µg/L. Chlorophyll-a 1.9 µg/L. TSI 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 59 µg/L | Not graded |
| Chlorophyll-a (Algae) | 1.9 µg/L | Not graded |
| Trophic State Index (TSI) | 50 | Mesotrophic |
Moderate nutrients, good water quality
Fishing Manning Creek Lake
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.058 m/yr | 2 |
Reservoir Info (USACE NID)
Manning Creek Lake is a man-made reservoir impounded by the Manning Meadow (completed 1970), built primarily for irrigation on the Manning Creek; earth-type dam, 85 ft tall and 315 ft long.
- Normal storage
- 1,000 ac-ft
- Max storage
- 1,369 ac-ft
- Drainage area
- 2 sq mi
- Hazard class
- Significant
- Owner
- DIVISION OF WILDLIFE RESOURCES
Source: USACE National Inventory of Dams, NID ID UT00195 · Operator website · Matched by proximity (0.61 km)
EPA Impairment Status
Manning Creek Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit UT-L-16030003-006_00 · Official waterbody report · Matched by proximity (0.51 km)
Graded lakes near Manning Creek Lake
Manning Creek Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Piute County
Frequently asked questions about Manning Creek Lake
Where is Manning Creek Lake?
- Manning Creek Lake is a lake in Piute County, Utah. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Manning Creek Lake?
- Manning Creek Lake in Piute County, Utah is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 59 µg/L. Chlorophyll-a (algae): 1.9 µg/L.
Is Manning Creek Lake safe to swim in?
- The letter is not a swimming clearance. Manning Creek Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, nutrients (phosphorus, nitrogen), pH / acidity. Check local advisories before you swim.
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Where this data comes from
3 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Utah Department Of Environmental Quality
UTAHDWQ_WQX3 samples · 2020
Analytical methods
- 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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database