Granger Lake Water Level Today - 504.07 ft, 100.0% Full

Brazos River · Texas - updated daily from official gauges

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

• Granger Lake is 100.0% full - effectively full on this site's capacity scale - as of September 8, 2026. Surface elevation 504.07 feet, storage 51,822 acre-feet (capacity basis 51,822 acre-feet), per Texas Water Development Board data.
• That elevation is 5.67 feet above its record low of 498.40 ft (November 14, 2011), in a daily record going back to October 2, 1995 (TWDB's period of record for this reservoir).
• Storage is 103% of the September 8 average across 31 years of record.
• Granger Lake is falling: elevation changed -0.11 ft over the past week, -0.96 ft over the past month, and -0.14 ft over the past year, per Texas Water Development Board data.

Granger Lake is holding near the top of its operating range at 100.0% of capacity, -0.14 ft over the past twelve months.

Granger Lake operating range

Granger Lake is operated within a narrow band rather than drawn down and refilled over years. As of September 8, 2026 it sits 0.07 feet above its 504.0 ft full-pool reference. Over the past two years the daily record ranges from 502.99 ft (December 3, 2024) to 513.17 ft (July 9, 2025) - a band of 10.18 feet. The highest reading in the full record is 523.02 ft on July 27, 2007.

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.

Granger Lake storage in context

Granger Lake water level, past 12 months

100.0% full at the latest reading - across the past 12 months it ranged from 94.6% (October 24, 2025) to 100.0% (September 8, 2026). Percent full is storage against the 51,822-acre-foot capacity basis, not a share of the elevation plotted above.

Granger Lake elevation, full record

100.0% full at the latest reading - across the storage record since January 22, 1980 it ranged from 1.2% (January 22, 1980) to 111.2% (June 18, 2008). Percent full is storage against the 51,822-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 Granger Lake today?

As of September 8, 2026, Granger Lake's surface elevation is 504.07 feet, with 51,822 acre-feet in storage - 100.0% of the 51,822 acre-foot capacity basis. Source: Water Data for Texas (TWDB) daily data.

How full is Granger Lake?

Granger Lake is 100.0% full as of September 8, 2026. Its storage is 103% of the September 8 average across its record since 1995. Source: Water Data for Texas (TWDB) daily data.

When was Granger Lake last full?

Granger Lake was last at or above 95% of its 51,822 acre-foot capacity basis on September 8, 2026. As of September 8, 2026 it is 100.0% full. Source: Water Data for Texas (TWDB) daily data.

Is Granger Lake rising or falling?

Granger Lake is falling: its elevation changed -0.11 feet over the week ending September 8, 2026, -0.96 ft over the past month, and -0.14 feet over the past year. Source: Water Data for Texas (TWDB) daily data.

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

Granger Lake's lowest surface elevation in the daily record since October 2, 1995 was 498.40 feet on November 14, 2011, per the daily record used by this site. As of September 8, 2026 the reservoir is 5.67 feet above that record low.

About this gauge

Granger Lake is a Texas water-supply reservoir in the Brazos River basin. Water Data for Texas publishes a conservation pool elevation of 504.0 ft and a conservation capacity of 51,822 acre-feet, with daily water level and storage recorded since 1980-01-22.

Operator

Texas Water Development Board (Water Data for Texas)

Station

granger

Measurements

Daily water level and conservation storage

River

Brazos River

State

Texas

Full pool reference

504.0 ft

Capacity basis

51,822 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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