Reservoir · Arizona · United States · USGS NWIS
San Carlos Reservoir
1.3% full
Capacity
1,076.8 hm³
Volume stored
14 hm³
Coordinates
33.175°N, 110.528°W
Last updated
2026-09-30
Current fill
1.3%vs 7 days ago
+0.4%gaining
vs 1 year ago
+0.8%year-over-year
7-day trend
→stable
Data source: USGS National Water Information System (NWIS) — daily reservoir storage volume. Capacity is the design (normal full-pool) capacity from the US National Inventory of Dams (NID); fill % = current volume ÷ design capacity. Last reading: 2026-09-30.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 33.175, -110.528 · Open in Google Maps
About San Carlos Reservoir
As of September 30, 2026, San Carlos Reservoir is filled to 1.3% of its total capacity, holding roughly 14 hm³ of water out of a maximum 1,077 hm³. At this level the reservoir is critically low.
Over the most recent week on record the fill level has held broadly steady (+0.4 pts), and it sits close to where it was a year earlier.
Across the readings we hold for San Carlos Reservoir — 1461 data points between October 1, 2022 and September 30, 2026 — the level has ranged from a low of 0.0% (May 22, 2026) to a high of 60.6% (April 23, 2023). On average the reservoir is fullest around April and at its lowest around September.
It is operated by USGS primarily for multiple purposes. It lies within the Arizona basin at 33.175°N, 110.528°W.
Key facts
- Current fill level
- 1.3%
- Water stored
- 14 hm³
- Total capacity
- 1,077 hm³
- 7-day change
- ▲ 0.4 pts
- Year-on-year
- ▲ 0.8 pts
- Primary use
- Multipurpose
- River basin
- Arizona
- Operator
- USGS
- Coordinates
- 33.175°N, 110.528°W
- Last updated
- September 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Sep 2026 | 1.3% | 14 |
| 29 Sep 2026 | 1.1% | 12 |
| 28 Sep 2026 | 1.0% | 10 |
| 27 Sep 2026 | 1.0% | 10 |
| 26 Sep 2026 | 0.9% | 10 |
| 25 Sep 2026 | 0.9% | 10 |
| 24 Sep 2026 | 0.9% | 10 |
| 23 Sep 2026 | 0.9% | 9 |
| 22 Sep 2026 | 0.8% | 9 |
| 21 Sep 2026 | 0.8% | 8 |
| 20 Sep 2026 | 0.7% | 8 |
| 19 Sep 2026 | 0.5% | 6 |