Monticello Reservoir Water Level Today - 335.34 ft, 75.5% Full

Cypress Creek · Texas - updated daily from official gauges

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

• Monticello Reservoir is 75.5% full - high on this site's capacity scale - as of September 8, 2026. Surface elevation 335.34 feet, storage 26,224 acre-feet (capacity basis 34,740 acre-feet), per Texas Water Development Board data.
• That elevation is its lowest September reading in a record going back to 1998, and 0.00 feet above its record low of 335.34 ft (September 8, 2026), in a daily record going back to July 10, 1998 (TWDB's period of record for this reservoir).
• Storage is 80% of the September 8 average across 28 years of record.
• Monticello Reservoir is falling: elevation changed -0.09 ft over the past week, -0.67 ft over the past month, and -1.47 ft over the past year, per Texas Water Development Board data.

Monticello Reservoir is within 0.00 feet of the lowest surface elevation in its daily record, set on September 8, 2026.

Monticello Reservoir vs its record low

In the daily record used by this site (going back to July 10, 1998 (TWDB's period of record for this reservoir)), Monticello Reservoir's lowest surface elevation was 335.34 feet on September 8, 2026, when storage was 26,224 acre-feet. As of September 8, 2026, Monticello Reservoir is at 335.34 feet - 0.00 feet above that record. The record high in the same series was 342.74 ft on December 28, 2015.

Monticello Reservoir storage in context

Monticello Reservoir water level, past 12 months

75.5% full at the latest reading - across the past 12 months it ranged from 75.5% (September 8, 2026) to 82.6% (September 8, 2025). Percent full is storage against the 34,740-acre-foot capacity basis, not a share of the elevation plotted above.

Monticello Reservoir elevation, full record

75.5% full at the latest reading - across the storage record since July 10, 1998 it ranged from 75.5% (September 8, 2026) to 100.0% (February 25, 2018). Percent full is storage against the 34,740-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 Monticello Reservoir today?

As of September 8, 2026, Monticello Reservoir's surface elevation is 335.34 feet, with 26,224 acre-feet in storage - 75.5% of the 34,740 acre-foot capacity basis. Source: Water Data for Texas (TWDB) daily data.

How full is Monticello Reservoir?

Monticello Reservoir is 75.5% full as of September 8, 2026. Its storage is 80% of the September 8 average across its record since 1998. Source: Water Data for Texas (TWDB) daily data.

When was Monticello Reservoir last full?

Monticello Reservoir was last at or above 95% of its 34,740 acre-foot capacity basis on June 5, 2024. As of September 8, 2026 it is 75.5% full. Source: Water Data for Texas (TWDB) daily data.

Is Monticello Reservoir rising or falling?

Monticello Reservoir is falling: its elevation changed -0.09 feet over the week ending September 8, 2026, -0.67 ft over the past month, and -1.47 feet over the past year. Source: Water Data for Texas (TWDB) daily data.

What was Monticello Reservoir's lowest water level on record?

Monticello Reservoir's lowest surface elevation in the daily record since July 10, 1998 was 335.34 feet on September 8, 2026, per the daily record used by this site. As of September 8, 2026 the reservoir is 0.00 feet above that record low.

About this gauge

Monticello Reservoir is a Texas water-supply reservoir in the Cypress Creek basin. Water Data for Texas publishes a conservation pool elevation of 340.0 ft and a conservation capacity of 34,740 acre-feet, with daily water level and storage recorded since 1998-07-10.

Operator

Texas Water Development Board (Water Data for Texas)

Station

monticello

Measurements

Daily water level and conservation storage

River

Cypress Creek

State

Texas

Full pool reference

340.0 ft

Capacity basis

34,740 acre-feet (Water Data for Texas (TWDB) conservation capacity)

Period of record

July 10, 1998 (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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