Lake Jacksonville Water Level Today - 421.52 ft, 97.8% Full

Neches River · Texas - updated daily from official gauges

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

• Lake Jacksonville is 97.8% full - effectively full on this site's capacity scale - as of September 8, 2026. Surface elevation 421.52 feet, storage 25,117 acre-feet (capacity basis 25,670 acre-feet), per Texas Water Development Board data.
• That elevation is its lowest September reading since 2023, and 5.16 feet above its record low of 416.36 ft (November 18, 2011), in a daily record going back to May 14, 1999 (TWDB's period of record for this reservoir).
• Storage is 98% of the September 8 average across 28 years of record.
• Lake Jacksonville is rising: elevation changed +0.65 ft over the past week, +0.00 ft over the past month, and -0.60 ft over the past year, per Texas Water Development Board data.

Lake Jacksonville is holding near the top of its operating range at 97.8% of capacity, -0.60 ft over the past twelve months.

Lake Jacksonville operating range

Lake Jacksonville is operated within a narrow band rather than drawn down and refilled over years. As of September 8, 2026 it sits 0.48 feet below its 422.0 ft full-pool reference. Over the past two years the daily record ranges from 420.87 ft (September 1, 2026) to 423.37 ft (May 1, 2025) - a band of 2.50 feet. The highest reading in the full record is 424.36 ft on July 6, 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.

Lake Jacksonville storage in context

Lake Jacksonville water level, past 12 months

97.8% full at the latest reading - across the past 12 months it ranged from 95.0% (September 1, 2026) to 100.0% (July 22, 2026). Percent full is storage against the 25,670-acre-foot capacity basis, not a share of the elevation plotted above.

Lake Jacksonville elevation, full record

97.8% full at the latest reading - across the storage record since May 14, 1999 it ranged from 76.5% (November 18, 2011) to 119.2% (June 8, 2005). Percent full is storage against the 25,670-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 Jacksonville today?

As of September 8, 2026, Lake Jacksonville's surface elevation is 421.52 feet, with 25,117 acre-feet in storage - 97.8% of the 25,670 acre-foot capacity basis. Source: Water Data for Texas (TWDB) daily data.

How full is Lake Jacksonville?

Lake Jacksonville is 97.8% full as of September 8, 2026. Its storage is 98% of the September 8 average across its record since 1999. Source: Water Data for Texas (TWDB) daily data.

When was Lake Jacksonville last full?

Lake Jacksonville was last at or above 95% of its 25,670 acre-foot capacity basis on September 8, 2026. As of September 8, 2026 it is 97.8% full. Source: Water Data for Texas (TWDB) daily data.

Is Lake Jacksonville rising or falling?

Lake Jacksonville is rising: its elevation changed +0.65 feet over the week ending September 8, 2026, +0.00 ft over the past month, and -0.60 feet over the past year. Source: Water Data for Texas (TWDB) daily data.

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

Lake Jacksonville's lowest surface elevation in the daily record since May 14, 1999 was 416.36 feet on November 18, 2011, per the daily record used by this site. As of September 8, 2026 the reservoir is 5.16 feet above that record low.

About this gauge

Lake Jacksonville is a Texas water-supply reservoir in the Neches River basin. Water Data for Texas publishes a conservation pool elevation of 422.0 ft and a conservation capacity of 25,670 acre-feet, with daily water level and storage recorded since 1999-05-14.

Operator

Texas Water Development Board (Water Data for Texas)

Station

jacksonville

Measurements

Daily water level and conservation storage

River

Neches River

State

Texas

Full pool reference

422.0 ft

Capacity basis

25,670 acre-feet (Water Data for Texas (TWDB) conservation capacity)

Period of record

May 14, 1999 (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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