Somerville Lake Water Level Today - 237.06 ft, 93.1% Full

Brazos River · Texas - updated daily from official gauges

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

• Somerville Lake is 93.1% full - high on this site's capacity scale - as of September 8, 2026. Surface elevation 237.06 feet, storage 139,924 acre-feet (capacity basis 150,293 acre-feet), per Texas Water Development Board data.
• That elevation is its lowest September reading since 2023, and 9.45 feet above its record low of 227.61 ft (December 13, 2011), in a daily record going back to October 2, 1995 (TWDB's period of record for this reservoir).
• Storage is 106% of the September 8 average across 31 years of record.
• Somerville Lake is falling: elevation changed -0.29 ft over the past week, -1.07 ft over the past month, and -0.48 ft over the past year, per Texas Water Development Board data.

Somerville Lake is holding near the top of its operating range at 93.1% of capacity, -0.48 ft over the past twelve months.

Somerville Lake operating range

Somerville Lake is operated within a narrow band rather than drawn down and refilled over years. As of September 8, 2026 it sits 0.94 feet below its 238.0 ft full-pool reference. Over the past two years the daily record ranges from 234.09 ft (April 1, 2026) to 240.79 ft (June 20, 2026) - a band of 6.70 feet. The highest reading in the full record is 259.77 ft on May 29, 2016.

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.

Somerville Lake storage in context

Somerville Lake water level, past 12 months

93.1% full at the latest reading - across the past 12 months it ranged from 72.8% (April 1, 2026) to 100.0% (August 13, 2026). Percent full is storage against the 150,293-acre-foot capacity basis, not a share of the elevation plotted above.

Somerville Lake elevation, full record

93.1% full at the latest reading - across the storage record since February 2, 1966 it ranged from 0.0% (February 2, 1966) to 103.2% (June 27, 2003). Percent full is storage against the 150,293-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 Somerville Lake today?

As of September 8, 2026, Somerville Lake's surface elevation is 237.06 feet, with 139,924 acre-feet in storage - 93.1% of the 150,293 acre-foot capacity basis. Source: Water Data for Texas (TWDB) daily data.

How full is Somerville Lake?

Somerville Lake is 93.1% full as of September 8, 2026. Its storage is 106% of the September 8 average across its record since 1995. Source: Water Data for Texas (TWDB) daily data.

When was Somerville Lake last full?

Somerville Lake was last at or above 95% of its 150,293 acre-foot capacity basis on September 1, 2026. As of September 8, 2026 it is 93.1% full. Source: Water Data for Texas (TWDB) daily data.

Is Somerville Lake rising or falling?

Somerville Lake is falling: its elevation changed -0.29 feet over the week ending September 8, 2026, -1.07 ft over the past month, and -0.48 feet over the past year. Source: Water Data for Texas (TWDB) daily data.

What was Somerville Lake's lowest water level on record?

Somerville Lake's lowest surface elevation in the daily record since October 2, 1995 was 227.61 feet on December 13, 2011, per the daily record used by this site. As of September 8, 2026 the reservoir is 9.45 feet above that record low.

About this gauge

Somerville Lake is a Texas water-supply reservoir in the Brazos River basin. Water Data for Texas publishes a conservation pool elevation of 238.0 ft and a conservation capacity of 150,293 acre-feet, with daily water level and storage recorded since 1966-02-02.

Operator

Texas Water Development Board (Water Data for Texas)

Station

somerville

Measurements

Daily water level and conservation storage

River

Brazos River

State

Texas

Full pool reference

238.0 ft

Capacity basis

150,293 acre-feet (Water Data for Texas (TWDB) conservation capacity)

Period of record

October 2, 1995 (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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