Lake Bob Sandlin Water Level Today - 335.45 ft, 90.7% Full

Cypress Creek · Texas - updated daily from official gauges

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

• Lake Bob Sandlin is 90.7% full - high on this site's capacity scale - as of September 8, 2026. Surface elevation 335.45 feet, storage 174,606 acre-feet (capacity basis 192,417 acre-feet), per Texas Water Development Board data.
• That elevation is its lowest September reading since 2014, and 8.74 feet above its record low of 326.71 ft (December 19, 2006), in a daily record going back to October 2, 1987 (TWDB's period of record for this reservoir).
• Storage is 96% of the September 8 average across 38 years of record.
• Lake Bob Sandlin is falling: elevation changed -0.15 ft over the past week, -0.72 ft over the past month, and -1.54 ft over the past year, per Texas Water Development Board data.

Lake Bob Sandlin is holding near the top of its operating range at 90.7% of capacity, -1.54 ft over the past twelve months.

Lake Bob Sandlin operating range

Lake Bob Sandlin is operated within a narrow band rather than drawn down and refilled over years. As of September 8, 2026 it sits 2.05 feet below its 337.5 ft full-pool reference. Over the past two years the daily record ranges from 335.45 ft (September 8, 2026) to 338.48 ft (May 7, 2025) - a band of 3.03 feet. The highest reading in the full record is 339.43 ft on December 28, 2015.

Storage above the full-pool reference is flood control space, not supply. A reservoir reading at or near 100% of its conservation capacity is being operated normally - it is not a surplus, and the operator may release water to hold that space.

Lake Bob Sandlin storage in context

Lake Bob Sandlin water level, past 12 months

90.7% full at the latest reading - across the past 12 months it ranged from 90.7% (September 8, 2026) to 97.7% (September 8, 2025). Percent full is storage against the 192,417-acre-foot capacity basis, not a share of the elevation plotted above.

Lake Bob Sandlin elevation, full record

90.7% full at the latest reading - across the storage record since August 9, 1977 it ranged from 0.3% (August 9, 1977) to 110.9% (July 22, 2000). Percent full is storage against the 192,417-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 Lake Bob Sandlin today?

As of September 8, 2026, Lake Bob Sandlin's surface elevation is 335.45 feet, with 174,606 acre-feet in storage - 90.7% of the 192,417 acre-foot capacity basis. Source: Water Data for Texas (TWDB) daily data.

How full is Lake Bob Sandlin?

Lake Bob Sandlin is 90.7% full as of September 8, 2026. Its storage is 96% of the September 8 average across its record since 1987. Source: Water Data for Texas (TWDB) daily data.

When was Lake Bob Sandlin last full?

Lake Bob Sandlin was last at or above 95% of its 192,417 acre-foot capacity basis on July 28, 2026. As of September 8, 2026 it is 90.7% full. Source: Water Data for Texas (TWDB) daily data.

Is Lake Bob Sandlin rising or falling?

Lake Bob Sandlin is falling: its elevation changed -0.15 feet over the week ending September 8, 2026, -0.72 ft over the past month, and -1.54 feet over the past year. Source: Water Data for Texas (TWDB) daily data.

What was Lake Bob Sandlin's lowest water level on record?

Lake Bob Sandlin's lowest surface elevation in the daily record since October 2, 1987 was 326.71 feet on December 19, 2006, per the daily record used by this site. As of September 8, 2026 the reservoir is 8.74 feet above that record low.

About this gauge

Lake Bob Sandlin is a Texas water-supply reservoir in the Cypress Creek basin. Water Data for Texas publishes a conservation pool elevation of 337.5 ft and a conservation capacity of 192,417 acre-feet, with daily water level and storage recorded since 1977-08-09.

Operator

Texas Water Development Board (Water Data for Texas)

Station

bob-sandlin

Measurements

Daily water level and conservation storage

River

Cypress Creek

State

Texas

Full pool reference

337.5 ft

Capacity basis

192,417 acre-feet (Water Data for Texas (TWDB) conservation capacity)

Period of record

October 2, 1987 (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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