San Carlos Reservoir behind Coolidge Dam at 211.2 acre-feet; Reuters says <1%

San Carlos — The latest U.S. Geological Survey reading for San Carlos Reservoir at Coolidge Dam shows stored water at 211.2 acre-feet, recorded at 6:30 a.m. MST on July 17, 2026. USGS also flags this as provisional data subject to revision and notes the station is a high data rate site where data are transmitted and updated hourly.

For residents and visitors, that “how much water is actually stored” number matters because drought reduces the amount of stored water that can buffer future dry spells. Drought.gov defines drought as a lack of precipitation over an extended period that results in a water shortage, and it says drought can disrupt ecosystems—including harming fish, wildlife, and plant species.

How “under 1%” gets explained (and where it comes from)

USGS does not publish a percent-full figure on the current-conditions snapshot. Instead, the USGS page reports reservoir storage in acre-feet—today’s value is 211.2 acre-feet as of 6:30 a.m. MST.

The “less than 1% full” framing comes from Reuters’ July 3, 2026 coverage, which described San Carlos Reservoir as less than 1% full after a record-low winter snowpack.

Why drought pressure shows up in stored water

In plain terms: when stored water is extremely low, there’s less reserve available to manage for later. Drought.gov describes drought impacts broadly, including effects on water quality and quantity and ecological harm—so low storage can mean more stressed conditions for both the natural system and the people who rely on it.

What locals and visitors should know about San Carlos Lake recreation

San Carlos Lake is formed by Coolidge Dam along the Gila River, and the Visit Arizona guide places it on San Carlos Apache Tribal Lands where tribal regulations are observed.

Visit Arizona says permits are required for all hiking, fishing and camping in the area. The same guide also gives practical access context: off Highway 70 south of the towns of San Carlos and Peridot, Coolidge Dam Road loops around the lake.

Because drought and reservoir levels can change quickly, people planning a trip should confirm current conditions and permit guidance before heading out.

Downstream irrigation planning: the reservoir’s role

Historically, the Coolidge Dam and San Carlos irrigation project was planned to support irrigation of 80,000 acres using a mix of natural flow from the Gila River and waters impounded by Coolidge Dam. That background helps explain why managers watch stored-water levels so closely during drought—reservoir storage is part of the system’s “captured” water supply.

This story is focused on the current storage measurement; it does not claim any specific, date-by-date delivery cutbacks unless an official action is announced.

What to watch next

To track whether storage is holding steady or dropping, start with the USGS current-conditions page for site 09469000, which shows the most recent instantaneous acre-feet value and timestamp. For trend context, USGS also provides continuous data graphs for the same monitoring location. For broader drought context across Arizona, Drought.gov is the central official reference readers can use to interpret changing water-supply conditions.

Sources

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