Lake Alan Henry: 75.0% full as of 2026-08-11
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 | 2026-08-11 | 75.0 | 2,210.28 | 72,142 | 72,142 | 96,207 | 2,200 |
| Yesterday | 2026-08-10 | 75.1 | 2,210.32 | 72,230 | 72,230 | 96,207 | 2,202 |
| 2 days ago | 2026-08-09 | 75.2 | 2,210.36 | 72,318 | 72,318 | 96,207 | 2,204 |
| 1 week ago | 2026-08-04 | 75.7 | 2,210.57 | 72,782 | 72,782 | 96,207 | 2,214 |
| 1 month ago | 2026-07-11 | 76.6 | 2,211.00 | 73,739 | 73,739 | 96,207 | 2,236 |
| 3 months ago | 2026-05-11 | 80.5 | 2,212.63 | 77,452 | 77,452 | 96,207 | 2,320 |
| 6 months ago | 2026-02-11 | 84.7 | 2,214.32 | 81,442 | 81,442 | 96,207 | 2,402 |
| 1 year ago | 2025-08-11 | 94.6 | 2,218.10 | 91,014 | 91,014 | 96,207 | 2,666 |
*
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 | 2026-08-11 16:30 | 2,210.26 | 2,220.00 | -9.74 |
| 1 hour prior | 2026-08-11 15:30 | 2,210.27 | 2,220.00 | -9.73 |
| 2 hours prior | 2026-08-11 14:30 | 2,210.25 | 2,220.00 | -9.75 |
| 6 hours prior | 2026-08-11 10:30 | 2,210.28 | 2,220.00 | -9.72 |
| 12 hours prior | 2026-08-11 04:30 | 2,210.28 | 2,220.00 | -9.72 |
| 24 hours prior | 2026-08-10 16:30 | 2,210.32 | 2,220.00 | -9.68 |
| 48 hours prior | 2026-08-09 16:30 | 2,210.35 | 2,220.00 | -9.65 |
*
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
