Canyon Lake Water Level Today - 908.94 ft, 99.9% Full

Canyon Dam · Guadalupe River · Texas - updated daily from official gauges

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

• Canyon Lake is 99.9% full - effectively full on this site's capacity scale - as of September 8, 2026. Surface elevation 908.94 feet, storage 378,287 acre-feet (capacity basis 378,781 acre-feet), per Texas Water Development Board data.
• That elevation is its highest September reading since 2016, and 31.98 feet above its record low of 876.96 ft (May 26, 2025), in a daily record going back to October 1, 1988 (TWDB's period of record for this reservoir).
• Storage is 110% of the September 8 average across 38 years of record.
• Canyon Lake is falling: elevation changed -0.28 ft over the past week, -1.17 ft over the past month, and +16.81 ft over the past year, per Texas Water Development Board data.

Canyon Lake is holding near the top of its operating range at 99.9% of capacity, +16.81 ft over the past twelve months.

Canyon Lake operating range

Canyon Lake is operated within a narrow band rather than drawn down and refilled over years. As of September 8, 2026 it sits 0.06 feet below its 909.0 ft full-pool reference. Over the past two years the daily record ranges from 876.96 ft (May 26, 2025) to 910.19 ft (August 6, 2026) - a band of 33.23 feet. The highest reading in the full record is 949.01 ft on July 6, 2002.

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.

Canyon Lake storage in context

Canyon Lake water level, past 12 months

99.9% full at the latest reading - across the past 12 months it ranged from 58.3% (April 18, 2026) to 100.0% (September 6, 2026). Percent full is storage against the 378,781-acre-foot capacity basis, not a share of the elevation plotted above.

Canyon Lake elevation, full record

99.9% full at the latest reading - across the storage record since July 25, 1962 it ranged from 0.1% (July 25, 1962) to 100.0% (September 6, 2026). Percent full is storage against the 378,781-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 Canyon Lake today?

As of September 8, 2026, Canyon Lake's surface elevation is 908.94 feet, with 378,287 acre-feet in storage - 99.9% of the 378,781 acre-foot capacity basis. Source: Water Data for Texas (TWDB) daily data.

How full is Canyon Lake?

Canyon Lake is 99.9% full as of September 8, 2026. Its storage is 110% of the September 8 average across its record since 1988. Source: Water Data for Texas (TWDB) daily data.

When was Canyon Lake last full?

Canyon Lake was last at or above 95% of its 378,781 acre-foot capacity basis on September 8, 2026. As of September 8, 2026 it is 99.9% full. Source: Water Data for Texas (TWDB) daily data.

Is Canyon Lake rising or falling?

Canyon Lake is falling: its elevation changed -0.28 feet over the week ending September 8, 2026, -1.17 ft over the past month, and +16.81 feet over the past year. Source: Water Data for Texas (TWDB) daily data.

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

Canyon Lake's lowest surface elevation in the daily record since October 1, 1988 was 876.96 feet on May 26, 2025, per the daily record used by this site. As of September 8, 2026 the reservoir is 31.98 feet above that record low.

About this gauge

Canyon Lake on the Guadalupe River between Austin and San Antonio is a US Army Corps of Engineers flood-control and water-supply reservoir.

Operator

Texas Water Development Board (Water Data for Texas)

Station

canyon

Measurements

Daily water level and conservation storage

Dam

Canyon Dam

River

Guadalupe River

State

Texas

Coordinates

29.8688, -98.1989 (USGS NWIS site 08167700 (NAD83))

Full pool reference

909.0 ft

Capacity basis

378,781 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.

Other reservoirs tracked

Texas & Rio Grande: Lake Travis, Lake Buchanan, Amistad Reservoir, Falcon Lake, Elephant Butte Reservoir.
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