San Carlos Reservoir
San Carlos Reservoir in Gila County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 13059 acres.
- Area
- 13,059 acres
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Why San Carlos 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 San Carlos Reservoir, no water-quality sampling on record for this lake.
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 ADEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
San Carlos Reservoir is a 13,059-acre lake in Gila County, Arizona.
Source: EPA Water Quality Portal sampling records, ADEQ, last sampled recent years. Grade methodology: LakeQuality methodology.
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Swimming Safety
Not ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for San Carlos Reservoir
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Trophic State Index: undefined.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) |
Where to stay near San Carlos Reservoir
Compare lakeside cabins, hotels, and vacation rentals near San Carlos Reservoir in Gila County, Arizona — 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.
Top-rated places to stay near San Carlos Reservoir
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 13,059 acres |
No bathymetric survey has been published for San Carlos Reservoir, so its depth is not documented here.
Fishing San Carlos Reservoir
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Frequently asked questions about San Carlos Reservoir
Where is San Carlos Reservoir?
- San Carlos Reservoir is a lake in Gila County, Arizona. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for San Carlos Reservoir?
- San Carlos Reservoir in Gila County, Arizona is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 13059 acres.
Is San Carlos Reservoir safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. San Carlos Reservoir is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
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Where this data comes from
Measurements for San Carlos Reservoir come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.