Pilot Butte Reservoir Lpd
Fremont County, Wyoming900 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.
- Public access
- Limited data
Pilot Butte Reservoir Lpd in Fremont County, Wyoming is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 30 µg/L. Surface area: 900 acres.
- Area
- 900 acres
- Phosphorus
- 30 µg/L
- Trend
- ↓ Declining
- Public access
- Yes
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Why Pilot Butte Reservoir Lpd 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 Pilot Butte Reservoir Lpd, 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.
Pilot Butte Reservoir Lpd is a 900-acre lake in Fremont County, Wyoming. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2014-09-08. 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 Pilot Butte Reservoir Lpd
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 30 µg/L. TSI 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 30 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 900 acres |
| Public Access | Yes |
No bathymetric survey has been published for Pilot Butte Reservoir Lpd, so its depth is not documented here.
Fishing Pilot Butte Reservoir Lpd
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↓ Declining | +10 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Pilot Butte Reservoir Lpd is a man-made reservoir impounded by the Pilot Butte Embankment 3 (completed 1926), built primarily for irrigation on the Wyoming Canal; earth-type dam, 12 ft tall and 3,400 ft long.
- Surface area
- 900 ac
- Normal storage
- 33,700 ac-ft
- Max storage
- 36,900 ac-ft
- Drainage area
- 9 sq mi
- Hazard class
- High
- Owner
- BUREAU OF RECLAMATION
Source: USACE National Inventory of Dams, NID ID WY01381 · Operator website · Matched by proximity (0.61 km)
Graded lakes near Pilot Butte Reservoir Lpd
Pilot Butte Reservoir Lpd has no grade, but these lakes within a short drive do.
Nearby Lakes in Fremont County
Frequently asked questions about Pilot Butte Reservoir Lpd
Where is Pilot Butte Reservoir Lpd?
- Pilot Butte Reservoir Lpd is a lake in Fremont 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 Pilot Butte Reservoir Lpd?
- Pilot Butte Reservoir Lpd in Fremont County, Wyoming is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 30 µg/L. Surface area: 900 acres.
Is Pilot Butte Reservoir Lpd safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Pilot Butte Reservoir Lpd across LakeQuality
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Where this data comes from
5 measurements from 1 monitoring station, 2013–2014. 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_WATERSHED5 samples · 2013–2014
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.