Stillhouse Hollow Lake Water Level Today - 621.34 ft, 98.2% Full

Brazos River · Texas - updated daily from official gauges

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

• Stillhouse Hollow Lake is 98.2% full - effectively full on this site's capacity scale - as of September 8, 2026. Surface elevation 621.34 feet, storage 225,584 acre-feet (capacity basis 229,796 acre-feet), per Texas Water Development Board data.
• That elevation is its lowest September reading since 2023, and 21.34 feet above its record low of 600.00 ft (September 8, 1999), in a daily record going back to October 1, 1988 (TWDB's period of record for this reservoir).
• Storage is 106% of the September 8 average across 37 years of record.
• Stillhouse Hollow Lake is falling: elevation changed -0.15 ft over the past week, -0.77 ft over the past month, and -1.04 ft over the past year, per Texas Water Development Board data.

Stillhouse Hollow Lake is holding near the top of its operating range at 98.2% of capacity, -1.04 ft over the past twelve months.

Stillhouse Hollow Lake operating range

Stillhouse Hollow Lake is operated within a narrow band rather than drawn down and refilled over years. As of September 8, 2026 it sits 0.66 feet below its 622.0 ft full-pool reference. Over the past two years the daily record ranges from 617.71 ft (April 30, 2025) to 631.92 ft (July 15, 2025) - a band of 14.21 feet. The highest reading in the full record is 663.99 ft on July 17, 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.

Stillhouse Hollow Lake storage in context

Stillhouse Hollow Lake water level, past 12 months

98.2% full at the latest reading - across the past 12 months it ranged from 92.7% (April 1, 2026) to 100.0% (August 12, 2026). Percent full is storage against the 229,796-acre-foot capacity basis, not a share of the elevation plotted above.

Stillhouse Hollow Lake elevation, full record

98.2% full at the latest reading - across the storage record since September 2, 1966 it ranged from 0.0% (September 2, 1966) to 101.3% (November 30, 2015). Percent full is storage against the 229,796-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 Stillhouse Hollow Lake today?

As of September 8, 2026, Stillhouse Hollow Lake's surface elevation is 621.34 feet, with 225,584 acre-feet in storage - 98.2% of the 229,796 acre-foot capacity basis. Source: Water Data for Texas (TWDB) daily data.

How full is Stillhouse Hollow Lake?

Stillhouse Hollow Lake is 98.2% full as of September 8, 2026. Its storage is 106% of the September 8 average across its record since 1988. Source: Water Data for Texas (TWDB) daily data.

When was Stillhouse Hollow Lake last full?

Stillhouse Hollow Lake was last at or above 95% of its 229,796 acre-foot capacity basis on September 8, 2026. As of September 8, 2026 it is 98.2% full. Source: Water Data for Texas (TWDB) daily data.

Is Stillhouse Hollow Lake rising or falling?

Stillhouse Hollow Lake is falling: its elevation changed -0.15 feet over the week ending September 8, 2026, -0.77 ft over the past month, and -1.04 feet over the past year. Source: Water Data for Texas (TWDB) daily data.

What was Stillhouse Hollow Lake's lowest water level on record?

Stillhouse Hollow Lake's lowest surface elevation in the daily record since October 1, 1988 was 600.00 feet on September 8, 1999, per the daily record used by this site. As of September 8, 2026 the reservoir is 21.34 feet above that record low.

About this gauge

Stillhouse Hollow Lake is a Texas water-supply reservoir in the Brazos River basin. Water Data for Texas publishes a conservation pool elevation of 622.0 ft and a conservation capacity of 229,796 acre-feet, with daily water level and storage recorded since 1966-09-02.

Operator

Texas Water Development Board (Water Data for Texas)

Station

stillhouse-hollow

Measurements

Daily water level and conservation storage

River

Brazos River

State

Texas

Full pool reference

622.0 ft

Capacity basis

229,796 acre-feet (Water Data for Texas (TWDB) conservation capacity)

Period of record

October 1, 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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