Reservoir · Arizona · United States · USGS NWIS
San Carlos Reservoir
0.1% full
Capacity
1,076.8 hm³
Volume stored
1 hm³
Coordinates
33.175°N, 110.528°W
Last updated
2026-08-12
Current fill
0.1%vs 7 days ago
+0.1%gaining
vs 1 year ago
-2.7%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: 2026-08-12.
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 August 12, 2026, San Carlos Reservoir is filled to 0.1% of its total capacity, holding roughly 1 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 (+0.1 pts), and it is 2.7 points below its level on the same date a year earlier.
Across the readings we hold for San Carlos Reservoir — 1460 data points between August 14, 2022 and August 12, 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 October.
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
- 0.1%
- Water stored
- 1 hm³
- Total capacity
- 1,077 hm³
- 7-day change
- ▲ 0.1 pts
- Year-on-year
- ▼ 2.7 pts
- Primary use
- Multipurpose
- River basin
- Arizona
- Operator
- USGS
- Coordinates
- 33.175°N, 110.528°W
- Last updated
- August 12, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 12 Aug 2026 | 0.1% | 1 |
| 11 Aug 2026 | 0.1% | 1 |
| 10 Aug 2026 | 0.1% | 1 |
| 9 Aug 2026 | 0.0% | 0 |
| 8 Aug 2026 | 0.0% | 0 |
| 7 Aug 2026 | 0.0% | 0 |
| 6 Aug 2026 | 0.0% | 0 |
| 5 Aug 2026 | 0.0% | 0 |
| 4 Aug 2026 | 0.0% | 0 |
| 3 Aug 2026 | 0.0% | 0 |
| 2 Aug 2026 | 0.0% | 0 |
| 1 Aug 2026 | 0.0% | 0 |
Frequently asked questions
What is the current water level of San Carlos Reservoir?
As of August 12, 2026, San Carlos Reservoir is at 0.1% of its capacity, holding approximately 1 hm³ of water, according to USGS NWIS data.
Is San Carlos Reservoir reservoir full?
No. As of August 12, 2026, San Carlos Reservoir is critically low at 0.1% of its capacity, so it is not full.
Is the water level at San Carlos Reservoir rising or falling?
The level at San Carlos Reservoir has been broadly stable over the latest week on record (+0.1 points).
How much water can San Carlos Reservoir hold?
San Carlos Reservoir has a total capacity of 1,077 hm³.
Where is San Carlos Reservoir reservoir located?
San Carlos Reservoir is located in Arizona, United States, within the Arizona basin (coordinates 33.175°N, 110.528°W).
What is San Carlos Reservoir used for?
San Carlos Reservoir is used primarily for multiple purposes, and is managed by USGS.