Lake Arlington Water Level Today - 544.33 ft, 73.7% Full

Trinity River · Texas - updated daily from official gauges

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

• Lake Arlington is 73.7% full - moderate on this site's capacity scale - as of September 8, 2026. Surface elevation 544.33 feet, storage 29,600 acre-feet (capacity basis 40,157 acre-feet), per Texas Water Development Board data.
• That elevation is 6.33 feet above its record low of 538.00 ft (August 30, 1988), in a daily record going back to January 3, 1988 (TWDB's period of record for this reservoir).
• Storage is 100% of the September 8 average across 35 years of record.
• Lake Arlington is falling: elevation changed -0.37 ft over the past week, -0.68 ft over the past month, and -3.46 ft over the past year, per Texas Water Development Board data.

Lake Arlington has fallen 3.46 feet in twelve months, and now sits 6.33 feet above its record low.

Lake Arlington vs its record low

In the daily record used by this site (going back to January 3, 1988 (TWDB's period of record for this reservoir)), Lake Arlington's lowest surface elevation was 538.00 feet on August 30, 1988, when storage was 18,180 acre-feet. As of September 8, 2026, Lake Arlington is at 544.33 feet - 6.33 feet above that record. The record high in the same series was 562.00 ft on May 18, 1989.

Lake Arlington storage in context

Lake Arlington water level, past 12 months

73.7% full at the latest reading - across the past 12 months it ranged from 73.7% (September 8, 2026) to 100.0% (June 11, 2026). Percent full is storage against the 40,157-acre-foot capacity basis, not a share of the elevation plotted above.

Lake Arlington elevation, full record

73.7% full at the latest reading - across the storage record since April 2, 1957 it ranged from 1.8% (April 2, 1957) to 100.0% (June 11, 2026). Percent full is storage against the 40,157-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 Arlington today?

As of September 8, 2026, Lake Arlington's surface elevation is 544.33 feet, with 29,600 acre-feet in storage - 73.7% of the 40,157 acre-foot capacity basis. Source: Water Data for Texas (TWDB) daily data.

How full is Lake Arlington?

Lake Arlington is 73.7% full as of September 8, 2026. Its storage is 100% of the September 8 average across its record since 1988. Source: Water Data for Texas (TWDB) daily data.

When was Lake Arlington last full?

Lake Arlington was last at or above 95% of its 40,157 acre-foot capacity basis on June 25, 2026. As of September 8, 2026 it is 73.7% full. Source: Water Data for Texas (TWDB) daily data.

Is Lake Arlington rising or falling?

Lake Arlington is falling: its elevation changed -0.37 feet over the week ending September 8, 2026, -0.68 ft over the past month, and -3.46 feet over the past year. Source: Water Data for Texas (TWDB) daily data.

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

Lake Arlington's lowest surface elevation in the daily record since January 3, 1988 was 538.00 feet on August 30, 1988, per the daily record used by this site. As of September 8, 2026 the reservoir is 6.33 feet above that record low.

About this gauge

Lake Arlington is a Texas water-supply reservoir in the Trinity River basin. Water Data for Texas publishes a conservation pool elevation of 550.0 ft and a conservation capacity of 40,157 acre-feet, with daily water level and storage recorded since 1957-04-02.

Operator

Texas Water Development Board (Water Data for Texas)

Station

arlington

Measurements

Daily water level and conservation storage

River

Trinity River

State

Texas

Full pool reference

550.0 ft

Capacity basis

40,157 acre-feet (Water Data for Texas (TWDB) conservation capacity)

Period of record

January 3, 1988 (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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