Monticello Reservoir water level today
On Oct 28, 2026, Monticello Reservoir is at 334.43 ft, 71.4% full (5.57 ft below full pool). That is 21.0 points below normal for this date.
Lowest on record (since 1998)Near normal
Source: Texas Water Development Board · storage 24,806 of 34,740 acre-ft · provisional data
Monticello Reservoir percent full history
Percent full Normal range (10th–90th percentile, 1996–2025) Average
Monticello Reservoir from space
The same area near the lowest and the highest level since 2016, on clear days. Compare the shoreline and the coves.
Imagery: NASA GIBS, Harmonized Landsat Sentinel-2 (HLS). Landsat 8/9 courtesy of NASA/USGS; contains modified Copernicus Sentinel data 2017, 2021. Black specks are cloud and shadow masks.
Records and key dates
- Record high
- 100.0%Jul 10, 1998
- Record low
- 71.4%Oct 27, 2026
- 12-month high
- 82.3%Jun 23, 2026
- 12-month low
- 71.4%Oct 27, 2026
- Last time full
- Feb 25, 2018
- Change in 1 year
- −1.70 ft−7.8 pts
About Monticello Reservoir
- River basin
- Cypress
- Full pool (top of conservation pool)
- 340.00 ft
- Conservation capacity
- 34,740 acre-ft
- Surface area today
- 1,530 acres
- Dead pool elevation
- 0.00 ft
- Flood control reservoir
- No
- Data since
- Jul 10, 1998
Monthly average, last 10 years
Average percent full each month.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 78% | 79% | 79% | 80% | 81% | 82% | 81% | 78% | 75% | 72% | — | — |
| 2025 | 84% | 87% | 88% | 87% | 88% | 88% | 85% | 82% | 82% | 80% | 78% | 79% |
| 2024 | 83% | 87% | 87% | 88% | 87% | 88% | 86% | 85% | 83% | 80% | 80% | 80% |
| 2023 | 83% | 86% | 85% | 85% | 85% | 86% | 85% | 82% | 79% | 78% | 79% | 79% |
| 2022 | 78% | 79% | 80% | 83% | 84% | 83% | 80% | 78% | 79% | 76% | 77% | 81% |
| 2021 | 87% | 88% | 87% | 86% | 90% | 87% | 85% | 83% | 81% | 79% | 77% | 77% |
| 2020 | 84% | 88% | 88% | 88% | 88% | 86% | 86% | 83% | 83% | 82% | 81% | 81% |
| 2019 | 88% | 87% | 87% | 89% | 89% | 88% | 86% | 83% | 81% | 81% | 81% | 81% |
| 2018 | 92% | 89% | 90% | 88% | 86% | 84% | 82% | 80% | 80% | 84% | 87% | 87% |
| 2017 | 99% | 100% | 100% | 100% | 99% | 100% | 100% | 100% | 99% | 99% | 100% | 98% |
Frequently asked questions
Is Monticello Reservoir full?
Not quite. On Oct 28, 2026 Monticello Reservoir was 71.4% full, 5.57 feet below its full pool elevation of 340.00 ft. It was last full on Feb 25, 2018.
What is the normal level of Monticello Reservoir for this time of year?
Between 1996 and 2025, Monticello Reservoir averaged 92.4% full around Oct 28, and 8 in 10 years it was between 78.3% and 100.0%. Today it is −21.0 percentage points below that average.
What is the lowest Monticello Reservoir has been?
In the TWDB record, which starts in 1998, the lowest daily value was 71.4% on Oct 27, 2026. The highest was 100.0% on Jul 10, 1998.
How often is the Monticello Reservoir water level updated?
TWDB publishes one reading per day for each reservoir. We check for new data every 2 hours and show the date of the reading next to the level. Recent values are provisional.
What does percent full mean?
It is the water stored in the conservation pool divided by the conservation capacity (34,740 acre-feet for Monticello Reservoir). Water above the conservation pool is flood storage and is not counted, so a reservoir can show 100% while rising into its flood pool.