Angostura Dam
Angostura Dam in Unknown, Mexico has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1.3 m visibility. Phosphorus: 89.3 µg/L. Chlorophyll-a (algae): 2.7 µg/L.
- Clarity
- 1.3 m
Why Angostura Dam has no A–F grade
Angostura Dam in Mexico is published with the authority's own measurements, not a LakeQuality letter. official authority class; not a LakeQuality A–F letter Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).
A letter on the LakeQuality scale would be an invention, not an official class. Everything below that has been measured is still reported on this page.
Monitoring: the National Water Commission of Mexico (CONAGUA), via UNEP GEMS/Water.
Angostura Dam is a lake in Unknown County, Mexico.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2020-08-23. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Angostura Dam
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Murky, only visible to about 4.3 ft. Phosphorus level: 89.3 µg/L. Chlorophyll-a: 2.7 µg/L. Trophic State Index: 55.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.3 m | Not graded |
| Phosphorus | 89.3 µg/L | Not graded |
| Chlorophyll-a (Algae) | 2.7 µg/L | Not graded |
| Trophic State Index (TSI) | 55 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Angostura Dam
Compare lakeside cabins, hotels, and vacation rentals near Angostura Dam in Unknown, Mexico — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
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Fishing Angostura Dam
Frequently asked questions about Angostura Dam
What is the water quality of Angostura Dam?
- Angostura Dam in Unknown, Mexico has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1.3 m visibility. Phosphorus: 89.3 µg/L. Chlorophyll-a (algae): 2.7 µg/L.
Is Angostura Dam safe to swim in?
- Angostura Dam has official nutrient and clarity measurements, not a bacteria swim class and not a safety clearance. Algal blooms, currents, and depth are not covered. Always check local notices before swimming.
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Where this data comes from
96 measurements from 5 monitoring stations, 2016–2020. Retrieved from UNEP GEMS/Water GFQA (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Comisión Nacional del Agua
comisionnacionaldelagua96 samples · —
Analytical methods
- GEMStat OPEN / CC BY 4.0
Monitoring station identifiers (5)
MEX03308MEX03309MEX03310MEX03311MEX03312
Authority classifications are stored separately from LakeQuality A–F letters and are never blended. See methodology and data sources.
Data Sources
Water quality data from the EPA Water Quality Portal
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2020-08-23
Monitoring stations: 5