Piedmont Reservoir D
Uinta County, Wyoming55 acresView 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.
- 23 ft max depth
- Limited data
Piedmont Reservoir D in Uinta County, Wyoming is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 17.3 µg/L. Surface area: 55 acres.
- Max depth
- ~23 ft est.
- Area
- 55 acres
- Phosphorus
- 17.3 µg/L
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Why Piedmont Reservoir D 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 Piedmont Reservoir D, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus, but not water clarity and algae (chlorophyll-a).
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 Wyoming DEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Piedmont Reservoir D is a 55-acre lake in Uinta County, Wyoming with an estimated average depth of about 23 feet.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2014-09-23. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Piedmont Reservoir D
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 17.3 µg/L. TSI 45.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 17.3 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~23 ft est. |
| Average Depth | ~14 ft est. |
| Surface Area | 55 acres |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Wyoming has not published bathymetry for Piedmont Reservoir D.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Fishing Piedmont Reservoir D
Reservoir Info (USACE NID)
Piedmont Reservoir D is a man-made reservoir impounded by the Piedmont (completed 1902), built primarily for irrigation on the Big Muddy Ck; earth-type dam, 34 ft tall and 549 ft long.
- Surface area
- 55 ac
- Normal storage
- 630 ac-ft
- Max storage
- 840 ac-ft
- Hazard class
- Low
- Owner
- GUILD FAMILY TRUST
Source: USACE National Inventory of Dams, NID ID WY01259 · Operator website · Matched by proximity (0.38 km)
Graded lakes near Piedmont Reservoir D
Piedmont Reservoir D has no grade, but these lakes within a short drive do.
Nearby Lakes in Uinta County
Frequently asked questions about Piedmont Reservoir D
Where is Piedmont Reservoir D?
- Piedmont Reservoir D is a lake in Uinta County, Wyoming. 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 Piedmont Reservoir D?
- Piedmont Reservoir D in Uinta County, Wyoming is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 17.3 µg/L. Surface area: 55 acres.
Is Piedmont Reservoir D safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Piedmont Reservoir D?
- No published bathymetric survey covers Piedmont Reservoir D, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 23 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 55 acres.
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Where this data comes from
3 measurements from 1 monitoring station, 2014. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- State of Wyoming Department of Environmental Quality Watershed Program
WYDEQ_WATERSHED3 samples · 2014
Analytical methods
- Total Phosphorus After Block Digestion
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
Lake size & watershed from HydroLAKES (HydroSHEDS)