Pat Mayse Lake water level today
On Oct 28, 2026, Pat Mayse Lake is at 448.60 ft, 88.4% full (2.40 ft below full pool). That is 2.9 points below normal for this date.
Source: Texas Water Development Board · storage 100,533 of 113,683 acre-ft · provisional data
Pat Mayse Lake percent full history
Percent full Normal range (10th–90th percentile, 1996–2025) Average
Pat Mayse Lake 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 2024, 2026. Black specks are cloud and shadow masks.
Records and key dates
- Record high
- 100.0%Jul 8, 1987
- Record low
- 65.3%Oct 15, 2006
- 12-month high
- 100.0%Jun 13, 2026
- 12-month low
- 87.0%Jan 22, 2026
- Last time full
- Aug 3, 2026
- Change in 1 year
- −0.77 ft−3.6 pts
About Pat Mayse Lake
- River basin
- Red
- Full pool (top of conservation pool)
- 451.00 ft
- Conservation capacity
- 113,683 acre-ft
- Surface area today
- 5,279 acres
- Dead pool elevation
- 415.00 ft
- Flood control reservoir
- Yes
- Data since
- Jul 8, 1987
Monthly average, last 10 years
Average percent full each month.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 88% | 88% | 89% | 91% | 93% | 98% | 100% | 98% | 93% | 90% | — | — |
| 2025 | 90% | 100% | 100% | 100% | 100% | 100% | 100% | 99% | 97% | 93% | 90% | 89% |
| 2024 | 91% | 95% | 99% | 100% | 100% | 100% | 100% | 97% | 94% | 90% | 88% | 88% |
| 2023 | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 99% | 96% | 93% | 92% | 91% |
| 2022 | 89% | 88% | 88% | 98% | 100% | 100% | 97% | 93% | 91% | 87% | 91% | 99% |
| 2021 | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 99% | 95% | 94% | 92% | 90% |
| 2020 | 100% | 100% | 100% | 100% | 100% | 100% | 99% | 99% | 100% | 100% | 100% | 100% |
| 2019 | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 99% | 96% | 96% | 98% | 100% |
| 2018 | 100% | 100% | 100% | 100% | 100% | 100% | 97% | — | — | 100% | 100% | 100% |
| 2017 | 88% | 89% | 89% | 97% | 100% | 100% | 100% | 100% | 100% | 99% | 97% | 97% |
Frequently asked questions
Is Pat Mayse Lake full?
Not quite. On Oct 28, 2026 Pat Mayse Lake was 88.4% full, 2.40 feet below its full pool elevation of 451.00 ft. It was last full on Aug 3, 2026.
What is the normal level of Pat Mayse Lake for this time of year?
Between 1996 and 2025, Pat Mayse Lake averaged 91.3% full around Oct 28, and 8 in 10 years it was between 83.1% and 100.0%. Today it is −2.9 percentage points below that average.
What is the lowest Pat Mayse Lake has been?
In the TWDB record, which starts in 1987, the lowest daily value was 65.3% on Oct 15, 2006. The highest was 100.0% on Jul 8, 1987.
How often is the Pat Mayse Lake 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 (113,683 acre-feet for Pat Mayse Lake). Water above the conservation pool is flood storage and is not counted, so a reservoir can show 100% while rising into its flood pool.