A And M Reservoir
Sweetwater County, Wyoming6 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.
- Limited data
A And M Reservoir in Sweetwater County, Wyoming is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 30 µg/L. Surface area: 6 acres.
- Area
- 6 acres
- Phosphorus
- 30 µg/L
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Watch A And M Reservoir’s letter
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Why A And M 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 A And M 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.
A And M Reservoir is a 6-acre lake in Sweetwater County, Wyoming.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2013-09-09. 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 A And M Reservoir
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 | 6 acres |
No bathymetric survey has been published for A And M Reservoir, so its depth is not documented here.
Fishing A And M Reservoir
Reservoir Info (USACE NID)
A And M Reservoir is a man-made reservoir impounded by the A & M (completed 1978), built primarily for fish and wildlife pond on the A & M Draw; earth-type dam, 31 ft tall and 344 ft long.
- Surface area
- 6 ac
- Normal storage
- 31 ac-ft
- Max storage
- 126 ac-ft
- Drainage area
- 1 sq mi
- Hazard class
- Low
- Owner
- USDI BLM
Source: USACE National Inventory of Dams, NID ID WY02496 · Operator website · Matched by proximity (0.07 km)
Graded lakes near A And M Reservoir
A And M Reservoir has no grade, but these lakes within a short drive do.
Nearby Lakes in Sweetwater County
Frequently asked questions about A And M Reservoir
Where is A And M Reservoir?
- A And M Reservoir is a lake in Sweetwater 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 A And M Reservoir?
- A And M Reservoir in Sweetwater County, Wyoming is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 30 µg/L. Surface area: 6 acres.
Is A And M Reservoir safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore A And M Reservoir across LakeQuality
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Where this data comes from
3 measurements from 1 monitoring station, 2013. 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 · 2013
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.