Sam Rayburn Reservoir Water Level Today - 154.99 ft, 67.0% Full

Neches River · Texas - updated daily from official gauges

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

• Sam Rayburn Reservoir is 67.0% full - moderate on this site's capacity scale - as of September 8, 2026. Surface elevation 154.99 feet, storage 1,915,177 acre-feet (capacity basis 2,857,077 acre-feet), per Texas Water Development Board data.
• That elevation is its lowest September reading since 2011, and 4.24 feet above its record low of 150.75 ft (August 11, 1996, the lowest since the reservoir first filled), in a daily record going back to June 19, 1988 (TWDB's period of record for this reservoir).
• Storage is 78% of the September 8 average across 39 years of record.
• Sam Rayburn Reservoir is falling: elevation changed -0.17 ft over the past week, -1.30 ft over the past month, and -2.54 ft over the past year, per Texas Water Development Board data.

Sam Rayburn Reservoir has fallen 2.54 feet in twelve months, and now sits 4.24 feet above its record low.

Sam Rayburn Reservoir vs its record low

In the daily record used by this site (going back to June 19, 1988 (TWDB's period of record for this reservoir)), Sam Rayburn Reservoir's lowest surface elevation since it first filled (first near-full reading 1989) was 150.75 feet on August 11, 1996, when storage was 1,585,615 acre-feet. As of September 8, 2026, Sam Rayburn Reservoir is at 154.99 feet - 4.24 feet above that record. The record high in the same series was 175.22 ft on June 3, 2021.

Sam Rayburn Reservoir storage in context

Sam Rayburn Reservoir water level, past 12 months

67.0% full at the latest reading - across the past 12 months it ranged from 66.9% (February 2, 2026) to 75.0% (September 8, 2025). Percent full is storage against the 2,857,077-acre-foot capacity basis, not a share of the elevation plotted above.

Sam Rayburn Reservoir elevation, full record

67.0% full at the latest reading - across the storage record since January 2, 1965 it ranged from 0.0% (January 2, 1965) to 101.5% (March 31, 2004). Percent full is storage against the 2,857,077-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 Sam Rayburn Reservoir today?

As of September 8, 2026, Sam Rayburn Reservoir's surface elevation is 154.99 feet, with 1,915,177 acre-feet in storage - 67.0% of the 2,857,077 acre-foot capacity basis. Source: Water Data for Texas (TWDB) daily data.

How full is Sam Rayburn Reservoir?

Sam Rayburn Reservoir is 67.0% full as of September 8, 2026. Its storage is 78% of the September 8 average across its record since 1988. Source: Water Data for Texas (TWDB) daily data.

When was Sam Rayburn Reservoir last full?

Sam Rayburn Reservoir was last at or above 95% of its 2,857,077 acre-foot capacity basis on July 7, 2025. As of September 8, 2026 it is 67.0% full. Source: Water Data for Texas (TWDB) daily data.

Is Sam Rayburn Reservoir rising or falling?

Sam Rayburn Reservoir is falling: its elevation changed -0.17 feet over the week ending September 8, 2026, -1.30 ft over the past month, and -2.54 feet over the past year. Source: Water Data for Texas (TWDB) daily data.

What was Sam Rayburn Reservoir's lowest water level on record?

Sam Rayburn Reservoir's lowest surface elevation since it first filled (its first near-full reading in this series is from 1989) was 150.75 feet on August 11, 1996, per the daily record used by this site. As of September 8, 2026 the reservoir is 4.24 feet above that record low.

About this gauge

Sam Rayburn Reservoir is a Texas water-supply reservoir in the Neches River basin. Water Data for Texas publishes a conservation pool elevation of 164.4 ft and a conservation capacity of 2,857,077 acre-feet, with daily water level and storage recorded since 1965-01-02.

Operator

Texas Water Development Board (Water Data for Texas)

Station

sam-rayburn

Measurements

Daily water level and conservation storage

River

Neches River

State

Texas

Full pool reference

164.4 ft

Capacity basis

2,857,077 acre-feet (Water Data for Texas (TWDB) conservation capacity)

Period of record

June 19, 1988 (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.

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