Grapevine Lake Water Level Today - 533.24 ft, 93.1% Full

Trinity River · Texas - updated daily from official gauges

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

• Grapevine Lake is 93.1% full - high on this site's capacity scale - as of September 8, 2026. Surface elevation 533.24 feet, storage 151,812 acre-feet (capacity basis 163,064 acre-feet), per Texas Water Development Board data.
• That elevation is its lowest September reading since 2023, and 11.46 feet above its record low of 521.78 ft (December 28, 2006), in a daily record going back to October 27, 1989 (TWDB's period of record for this reservoir).
• Storage is 103% of the September 8 average across 37 years of record.
• Grapevine Lake is falling: elevation changed -0.31 ft over the past week, -1.30 ft over the past month, and -1.48 ft over the past year, per Texas Water Development Board data.

Grapevine Lake is holding near the top of its operating range at 93.1% of capacity, -1.48 ft over the past twelve months.

Grapevine Lake operating range

Grapevine Lake is operated within a narrow band rather than drawn down and refilled over years. As of September 8, 2026 it sits 1.76 feet below its 535.0 ft full-pool reference. Over the past two years the daily record ranges from 532.77 ft (October 30, 2024) to 542.03 ft (May 10, 2025) - a band of 9.26 feet. The highest reading in the full record is 562.98 ft on June 20, 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.

Grapevine Lake storage in context

Grapevine Lake water level, past 12 months

93.1% full at the latest reading - across the past 12 months it ranged from 93.1% (September 8, 2026) to 100.0% (July 29, 2026). Percent full is storage against the 163,064-acre-foot capacity basis, not a share of the elevation plotted above.

Grapevine Lake elevation, full record

93.1% full at the latest reading - across the storage record since July 2, 1952 it ranged from 0.0% (July 2, 1952) to 101.0% (June 24, 2011). Percent full is storage against the 163,064-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 Grapevine Lake today?

As of September 8, 2026, Grapevine Lake's surface elevation is 533.24 feet, with 151,812 acre-feet in storage - 93.1% of the 163,064 acre-foot capacity basis. Source: Water Data for Texas (TWDB) daily data.

How full is Grapevine Lake?

Grapevine Lake is 93.1% full as of September 8, 2026. Its storage is 103% of the September 8 average across its record since 1989. Source: Water Data for Texas (TWDB) daily data.

When was Grapevine Lake last full?

Grapevine Lake was last at or above 95% of its 163,064 acre-foot capacity basis on August 28, 2026. As of September 8, 2026 it is 93.1% full. Source: Water Data for Texas (TWDB) daily data.

Is Grapevine Lake rising or falling?

Grapevine Lake is falling: its elevation changed -0.31 feet over the week ending September 8, 2026, -1.30 ft over the past month, and -1.48 feet over the past year. Source: Water Data for Texas (TWDB) daily data.

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

Grapevine Lake's lowest surface elevation in the daily record since October 27, 1989 was 521.78 feet on December 28, 2006, per the daily record used by this site. As of September 8, 2026 the reservoir is 11.46 feet above that record low.

About this gauge

Grapevine Lake is a Texas water-supply reservoir in the Trinity River basin. Water Data for Texas publishes a conservation pool elevation of 535.0 ft and a conservation capacity of 163,064 acre-feet, with daily water level and storage recorded since 1952-07-02.

Operator

Texas Water Development Board (Water Data for Texas)

Station

grapevine

Measurements

Daily water level and conservation storage

River

Trinity River

State

Texas

Full pool reference

535.0 ft

Capacity basis

163,064 acre-feet (Water Data for Texas (TWDB) conservation capacity)

Period of record

October 27, 1989 (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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