Twin Butte Reservoir
Albany County, WyomingView 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
Twin Butte Reservoir in Albany County, Wyoming is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 65 µg/L.
- Phosphorus
- 65 µg/L
- Trend
- ↑ Improving
- Public access
- Yes
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Watch Twin Butte Reservoir’s letter
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Why Twin Butte Reservoir 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 Twin Butte Reservoir, 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.
Twin Butte Reservoir is a lake in Albany County, Wyoming. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2014-09-17. 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 Twin Butte Reservoir
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 65 µg/L. TSI 64.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 65 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 64 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Fishing Twin Butte Reservoir
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -7.25 µg/L/yr | 3 |
Graded lakes near Twin Butte Reservoir
Twin Butte Reservoir has no grade, but these lakes within a short drive do.
Nearby Lakes in Albany County
Frequently asked questions about Twin Butte Reservoir
Where is Twin Butte Reservoir?
- Twin Butte Reservoir is a lake in Albany 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 Twin Butte Reservoir?
- Twin Butte Reservoir in Albany County, Wyoming is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 65 µg/L.
Is Twin Butte Reservoir safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Twin Butte Reservoir across LakeQuality
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Where this data comes from
6 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_WATERSHED6 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.