Amistad Reservoir Water Level Today - 1,056.57 ft, 39.1% Full

Amistad Dam · Rio Grande · Texas / Coahuila (US–Mexico) - updated daily from official gauges

Western Reservoir Conditions·Daily·No. 47·Tuesday, September 8, 2026·Latest reading September 7, 2026

• Amistad Reservoir is 39.1% full - low on this site's capacity scale - as of September 7, 2026. Surface elevation 1,056.57 feet, storage 709,446 acre-feet (capacity basis 1,813,408 acre-feet), per Texas Water Development Board data.
• That elevation is 12.96 feet above its record low of 1,043.61 ft (September 29, 2023, the lowest since the reservoir first filled), in a daily record going back to June 1, 1968 (TWDB's period of record for this reservoir).
• Storage is 54% of the September 7 average across 59 years of record.
• Amistad Reservoir is falling: elevation changed -0.12 ft over the past week, -0.33 ft over the past month, and -0.46 ft over the past year, per Texas Water Development Board data.

Amistad Reservoir has held roughly steady over the past twelve months (-0.46 ft in surface elevation).

Amistad Reservoir vs its record low

In the daily record used by this site (going back to June 1, 1968 (TWDB's period of record for this reservoir)), Amistad Reservoir's lowest surface elevation since it first filled (first near-full reading 1972) was 1,043.61 feet on September 29, 2023, when storage was 619,464 acre-feet. As of September 7, 2026, Amistad Reservoir is at 1,056.57 feet - 12.96 feet above that record. The record high in the same series was 1,129.99 ft on October 28, 1974.

Amistad Reservoir storage in context

Amistad Reservoir water level, past 12 months

39.1% full at the latest reading - across the past 12 months it ranged from 29.2% (June 14, 2026) to 39.3% (August 30, 2026). Percent full is storage against the 1,813,408-acre-foot capacity basis, not a share of the elevation plotted above.

Amistad Reservoir elevation, full record

39.1% full at the latest reading - across the storage record since June 1, 1968 it ranged from 0.1% (June 1, 1968) to 101.5% (April 12, 2011). Percent full is storage against the 1,813,408-acre-foot capacity basis, not a share of the elevation plotted above. Every percentage here is measured against today's capacity basis; a reservoir's surveyed capacity changes as sediment accumulates behind the dam, so early-record percentages are indicative rather than exact.

Last 14 daily readings

Frequently asked questions

What is the water level of Amistad Reservoir today?

As of September 7, 2026, Amistad Reservoir's surface elevation is 1,056.57 feet, with 709,446 acre-feet in storage - 39.1% of the 1,813,408 acre-foot capacity basis. Source: Water Data for Texas (TWDB) daily data.

How full is Amistad Reservoir?

Amistad Reservoir is 39.1% full as of September 7, 2026. Its storage is 54% of the September 7 average across its record since 1968. Source: Water Data for Texas (TWDB) daily data.

When was Amistad Reservoir last full?

Amistad Reservoir was last at or above 95% of its 1,813,408 acre-foot capacity basis on June 16, 2011. As of September 7, 2026 it is 39.1% full. Source: Water Data for Texas (TWDB) daily data.

Is Amistad Reservoir rising or falling?

Amistad Reservoir is falling: its elevation changed -0.12 feet over the week ending September 7, 2026, -0.33 ft over the past month, and -0.46 feet over the past year. Source: Water Data for Texas (TWDB) daily data.

What was Amistad Reservoir's lowest water level on record?

Amistad Reservoir's lowest surface elevation since it first filled (its first near-full reading in this series is from 1972) was 1,043.61 feet on September 29, 2023, per the daily record used by this site. As of September 7, 2026 the reservoir is 12.96 feet above that record low.

About this gauge

Amistad Reservoir on the Rio Grande near Del Rio is operated by the International Boundary and Water Commission and shared by the United States and Mexico.

Operator

Texas Water Development Board (Water Data for Texas)

Station

amistad

Measurements

Daily water level and conservation storage

Dam

Amistad Dam

River

Rio Grande

State

Texas / Coahuila (US–Mexico)

Coordinates

29.4502, -101.0587 (USGS NWIS site 08450700 (NAD83))

Full pool reference

1,117.0 ft

Capacity basis

1,813,408 acre-feet (Water Data for Texas (TWDB) conservation capacity)

Period of record

June 1, 1968 (TWDB's period of record for this reservoir)

Status

Provisional - subject to revision by the reporting agency

Update cadence

Daily

TWDB reports conservation storage against a conservation capacity that is restated as new volumetric surveys are completed, so a percent-full figure here can change without the water level changing. TWDB's methodology page is linked in the notes below.

Download the daily CSV (date, elevation ft, storage AF) or see all data downloads.

Other reservoirs tracked

Texas & Rio Grande: Lake Travis, Lake Buchanan, Canyon Lake, Falcon Lake, Elephant Butte Reservoir.
Also: Lake Mead, Lake Powell, Lake Mohave, Lake Havasu, Flaming Gorge Reservoir, Blue Mesa Reservoir, Navajo Reservoir, Shasta Lake, Lake Oroville, Folsom Lake, Lake Berryessa, New Melones Lake, Trinity Lake, Don Pedro Reservoir, San Luis Reservoir.