Lake L. B. Johnson Water Level Today - 824.81 ft, 98.9% Full

Colorado River (Texas) · Texas - updated daily from official gauges

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

• Lake L. B. Johnson is 98.9% full - effectively full on this site's capacity scale - as of September 8, 2026. Surface elevation 824.81 feet, storage 111,557 acre-feet (capacity basis 112,778 acre-feet), per Texas Water Development Board data.
• That elevation is 31.01 feet above its record low of 793.80 ft (November 16, 1970), in a daily record going back to August 1, 1951 (TWDB's period of record for this reservoir).
• Storage is 102% of the September 8 average across 76 years of record.
• Lake L. B. Johnson is rising: elevation changed +0.07 ft over the past week, +0.08 ft over the past month, and +0.06 ft over the past year, per Texas Water Development Board data.

Lake L. B. Johnson is holding near the top of its operating range at 98.9% of capacity, +0.06 ft over the past twelve months.

Lake L. B. Johnson operating range

Lake L. B. Johnson is operated within a narrow band rather than drawn down and refilled over years. As of September 8, 2026 it sits 0.19 feet below its 825.0 ft full-pool reference. Over the past two years the daily record ranges from 823.75 ft (July 17, 2026) to 824.90 ft (April 24, 2026) - a band of 1.15 feet. The highest reading in the full record is 828.00 ft on September 11, 1952.

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 L. B. Johnson storage in context

Lake L. B. Johnson water level, past 12 months

98.9% full at the latest reading - across the past 12 months it ranged from 92.9% (July 17, 2026) to 99.4% (June 3, 2026). Percent full is storage against the 112,778-acre-foot capacity basis, not a share of the elevation plotted above.

Lake L. B. Johnson elevation, full record

98.9% full at the latest reading - across the storage record since August 1, 1951 it ranged from 0.5% (November 16, 1970) to 100.0% (October 16, 2018). Percent full is storage against the 112,778-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 L. B. Johnson today?

As of September 8, 2026, Lake L. B. Johnson's surface elevation is 824.81 feet, with 111,557 acre-feet in storage - 98.9% of the 112,778 acre-foot capacity basis. Source: Water Data for Texas (TWDB) daily data.

How full is Lake L. B. Johnson?

Lake L. B. Johnson is 98.9% full as of September 8, 2026. Its storage is 102% of the September 8 average across its record since 1951. Source: Water Data for Texas (TWDB) daily data.

When was Lake L. B. Johnson last full?

Lake L. B. Johnson was last at or above 95% of its 112,778 acre-foot capacity basis on September 8, 2026. As of September 8, 2026 it is 98.9% full. Source: Water Data for Texas (TWDB) daily data.

Is Lake L. B. Johnson rising or falling?

Lake L. B. Johnson is rising: its elevation changed +0.07 feet over the week ending September 8, 2026, +0.08 ft over the past month, and +0.06 feet over the past year. Source: Water Data for Texas (TWDB) daily data.

What was Lake L. B. Johnson's lowest water level on record?

Lake L. B. Johnson's lowest surface elevation in the daily record since August 1, 1951 was 793.80 feet on November 16, 1970, per the daily record used by this site. As of September 8, 2026 the reservoir is 31.01 feet above that record low.

About this gauge

Lake L. B. Johnson is a Texas water-supply reservoir in the Colorado River (Texas) basin. Water Data for Texas publishes a conservation pool elevation of 825.0 ft and a conservation capacity of 112,778 acre-feet, with daily water level and storage recorded since 1951-08-01.

Operator

Texas Water Development Board (Water Data for Texas)

Station

lyndon-b-johnson

Measurements

Daily water level and conservation storage

River

Colorado River (Texas)

State

Texas

Full pool reference

825.0 ft

Capacity basis

112,778 acre-feet (Water Data for Texas (TWDB) conservation capacity)

Period of record

August 1, 1951 (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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