Grapevine Lake water level today
On Oct 28, 2026, Grapevine Lake is at 532.58 ft, 90.6% full (2.42 ft below full pool). That is 3.8 points above normal for this date.
Source: Texas Water Development Board · storage 147,747 of 163,064 acre-ft · provisional data
Grapevine Lake percent full history
Percent full Normal range (10th–90th percentile, 1996–2025) Average
Records and key dates
- Record high
- 100.0%Mar 12, 1990
- Record low
- 54.8%Dec 19, 2006
- 12-month high
- 100.0%Nov 20, 2025
- 12-month low
- 89.2%Sep 30, 2026
- Last time full
- Jul 29, 2026
- Change in 1 year
- −2.25 ft−8.7 pts
About Grapevine Lake
- River basin
- Trinity
- Full pool (top of conservation pool)
- 535.00 ft
- Conservation capacity
- 163,064 acre-ft
- Surface area today
- 6,104 acres
- Dead pool elevation
- 475.00 ft
- Flood control reservoir
- Yes
- Water supply for
- Dallas
- Data since
- Oct 27, 1989
Monthly average, last 10 years
Average percent full each month.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 98% | 99% | 100% | 100% | 100% | 100% | 100% | 97% | 92% | 92% | — | — |
| 2025 | 99% | 100% | 100% | 100% | 100% | 100% | 100% | 98% | 98% | 96% | 99% | 99% |
| 2024 | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 97% | 93% | 93% | 95% |
| 2023 | 100% | 100% | 100% | 100% | 100% | 99% | 94% | 90% | 84% | 84% | 96% | 96% |
| 2022 | 95% | 95% | 95% | 99% | 100% | 100% | 98% | 96% | 99% | 97% | 100% | 100% |
| 2021 | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 99% | 96% | 96% | 96% |
| 2020 | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 99% | 100% | 98% | 98% | 98% |
| 2019 | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 97% | 92% | 98% | 100% |
| 2018 | 97% | 98% | 100% | 100% | 100% | 97% | 92% | 88% | 92% | 100% | 100% | 100% |
| 2017 | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 99% | 98% | 97% | 97% |
Frequently asked questions
Is Grapevine Lake full?
Not quite. On Oct 28, 2026 Grapevine Lake was 90.6% full, 2.42 feet below its full pool elevation of 535.00 ft. It was last full on Jul 29, 2026.
What is the normal level of Grapevine Lake for this time of year?
Between 1996 and 2025, Grapevine Lake averaged 86.8% full around Oct 28, and 8 in 10 years it was between 64.6% and 100.0%. Today it is +3.8 percentage points above that average.
What is the lowest Grapevine Lake has been?
In the TWDB record, which starts in 1989, the lowest daily value was 54.8% on Dec 19, 2006. The highest was 100.0% on Mar 12, 1990.
How often is the Grapevine 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 (163,064 acre-feet for Grapevine 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.