Lake Alan Henry: 74.5% full as of 2026-08-15
Historical Data
| Date | Percent Full |
Mean Water Level (ft) |
Reservoir Storage (acre-ft) |
Conservation Storage (acre-ft) |
Conservation Capacity (acre-ft) |
Surface Area (acres) |
|
|---|---|---|---|---|---|---|---|
| Today | 2026-08-15 | 74.5 | 2,210.08 | 71,703 | 71,703 | 96,207 | 2,191 |
| Yesterday | 2026-08-14 | 74.6 | 2,210.12 | 71,791 | 71,791 | 96,207 | 2,193 |
| 2 days ago | 2026-08-13 | 74.7 | 2,210.17 | 71,900 | 71,900 | 96,207 | 2,195 |
| 1 week ago | 2026-08-08 | 75.3 | 2,210.40 | 72,406 | 72,406 | 96,207 | 2,206 |
| 1 month ago | 2026-07-15 | 76.7 | 2,211.04 | 73,828 | 73,828 | 96,207 | 2,239 |
| 3 months ago | 2026-05-15 | 80.2 | 2,212.52 | 77,197 | 77,197 | 96,207 | 2,314 |
| 6 months ago | 2026-02-15 | 84.8 | 2,214.39 | 81,610 | 81,610 | 96,207 | 2,406 |
| 1 year ago | 2025-08-15 | 94.8 | 2,218.16 | 91,174 | 91,174 | 96,207 | 2,670 |
*
Percent Full is based on Conservation Storage and Conservation Capacity and doesn't account for storage in flood pool.
**
Values above, including today's are averaged conditions. For near real-time instantaneous water level, see table below or the interactive map viewer.
Most Recent Instantaneous Water Level
| Date/time |
Water Level (ft) |
Conservation Pool Elevation (ft) |
Height Above Conservation Pool (ft) |
|
|---|---|---|---|---|
| Most recent | 2026-08-15 19:30 | 2,210.07 | 2,220.00 | -9.93 |
| 1 hour prior | 2026-08-15 18:30 | 2,210.05 | 2,220.00 | -9.95 |
| 2 hours prior | 2026-08-15 17:30 | 2,210.06 | 2,220.00 | -9.94 |
| 6 hours prior | 2026-08-15 13:30 | 2,210.07 | 2,220.00 | -9.93 |
| 12 hours prior | 2026-08-15 07:30 | 2,210.08 | 2,220.00 | -9.92 |
| 24 hours prior | 2026-08-14 19:30 | 2,210.11 | 2,220.00 | -9.89 |
| 48 hours prior | 2026-08-13 19:30 | 2,210.14 | 2,220.00 | -9.86 |
*
Data is provisional and subject to revision.
Additional Information
| Impoundment date | 1994-01-01 |
| Vertical datum | NGVD29 |
| Service spillway crest elevation | 2,220.00 ft above NGVD29 |
| Emergency spillway crest elevation | 2,240.00 ft above NGVD29 |
| Maximum design elevation | 2,245.00 ft above NGVD29 |
| Top of dam elevation | 2,263.00 ft above NGVD29 |
| Conservation pool elevation | 2,220.00 ft above NGVD29 |
| Data download (CSV) | period of record, last one year, last 30 days |
Elevation-Area-Capacity Curves
1993-10-01 (source: USGS)
2005-07-01 (source: TWDB)
: GIS Data
2017-08-01 (source: TWDB)
: GIS Data
|
|
| Data Source | USGS:08079700 |
| USGS Monitoring Location | USGS:08079700 |
Lake Location
