Lake Marble Falls Water Level Today - 736.45 ft, 95.6% 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 Marble Falls is 95.6% full - effectively full on this site's capacity scale - as of September 8, 2026. Surface elevation 736.45 feet, storage 7,263 acre-feet (capacity basis 7,597 acre-feet), per Texas Water Development Board data.
• That elevation is 53.67 feet above its record low of 682.78 ft (April 29, 1999), in a daily record going back to January 1, 1966 (TWDB's period of record for this reservoir).
• Storage is 103% of the September 8 average across 51 years of record.
• Lake Marble Falls is falling: elevation changed -0.06 ft over the past week, +0.20 ft over the past month, and +0.03 ft over the past year, per Texas Water Development Board data.

Lake Marble Falls is holding near the top of its operating range at 95.6% of capacity, +0.03 ft over the past twelve months.

Lake Marble Falls operating range

Lake Marble Falls is operated within a narrow band rather than drawn down and refilled over years. As of September 8, 2026 it sits 0.55 feet below its 737.0 ft full-pool reference. Over the past two years the daily record ranges from 735.60 ft (July 20, 2026) to 737.06 ft (July 5, 2025) - a band of 1.46 feet. The highest reading in the full record is 820.98 ft on October 16, 1995.

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 Marble Falls storage in context

Lake Marble Falls water level, past 12 months

95.6% full at the latest reading - across the past 12 months it ranged from 89.0% (July 20, 2026) to 97.6% (August 20, 2026). Percent full is storage against the 7,597-acre-foot capacity basis, not a share of the elevation plotted above.

Lake Marble Falls elevation, full record

95.6% full at the latest reading - across the storage record since January 1, 1966 it ranged from 0.0% (April 29, 1999) to 100.0% (July 5, 2025). Percent full is storage against the 7,597-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 Marble Falls today?

As of September 8, 2026, Lake Marble Falls's surface elevation is 736.45 feet, with 7,263 acre-feet in storage - 95.6% of the 7,597 acre-foot capacity basis. Source: Water Data for Texas (TWDB) daily data.

How full is Lake Marble Falls?

Lake Marble Falls is 95.6% full as of September 8, 2026. Its storage is 103% of the September 8 average across its record since 1966. Source: Water Data for Texas (TWDB) daily data.

When was Lake Marble Falls last full?

Lake Marble Falls was last at or above 95% of its 7,597 acre-foot capacity basis on September 8, 2026. As of September 8, 2026 it is 95.6% full. Source: Water Data for Texas (TWDB) daily data.

Is Lake Marble Falls rising or falling?

Lake Marble Falls is falling: its elevation changed -0.06 feet over the week ending September 8, 2026, +0.20 ft over the past month, and +0.03 feet over the past year. Source: Water Data for Texas (TWDB) daily data.

What was Lake Marble Falls's lowest water level on record?

Lake Marble Falls's lowest surface elevation in the daily record since January 1, 1966 was 682.78 feet on April 29, 1999, per the daily record used by this site. As of September 8, 2026 the reservoir is 53.67 feet above that record low.

About this gauge

Lake Marble Falls is a Texas water-supply reservoir in the Colorado River (Texas) basin. Water Data for Texas publishes a conservation pool elevation of 737.0 ft and a conservation capacity of 7,597 acre-feet, with daily water level and storage recorded since 1966-01-01.

Operator

Texas Water Development Board (Water Data for Texas)

Station

marble-falls

Measurements

Daily water level and conservation storage

River

Colorado River (Texas)

State

Texas

Full pool reference

737.0 ft

Capacity basis

7,597 acre-feet (Water Data for Texas (TWDB) conservation capacity)

Period of record

January 1, 1966 (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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