Lake Alan Henry: 76.2% full as of 2026-07-30
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 | 2026-07-30 | 76.2 | 2,210.82 | 73,337 | 73,337 | 96,207 | 2,227 |
| Yesterday | 2026-07-29 | 76.3 | 2,210.84 | 73,382 | 73,382 | 96,207 | 2,228 |
| 2 days ago | 2026-07-28 | 76.4 | 2,210.88 | 73,471 | 73,471 | 96,207 | 2,230 |
| 1 week ago | 2026-07-23 | 76.9 | 2,211.13 | 74,030 | 74,030 | 96,207 | 2,243 |
| 1 month ago | 2026-06-30 | 77.6 | 2,211.39 | 74,615 | 74,615 | 96,207 | 2,257 |
| 3 months ago | 2026-04-30 | 81.2 | 2,212.91 | 78,103 | 78,103 | 96,207 | 2,334 |
| 6 months ago | 2026-01-30 | 85.0 | 2,214.47 | 81,803 | 81,803 | 96,207 | 2,410 |
| 1 year ago | 2025-07-30 | 95.9 | 2,218.55 | 92,221 | 92,221 | 96,207 | 2,698 |
*
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 | 2026-07-30 15:30 | 2,210.80 | 2,220.00 | -9.20 |
| 1 hour prior | 2026-07-30 14:30 | 2,210.81 | 2,220.00 | -9.19 |
| 2 hours prior | 2026-07-30 13:30 | 2,210.81 | 2,220.00 | -9.19 |
| 6 hours prior | 2026-07-30 09:30 | 2,210.82 | 2,220.00 | -9.18 |
| 12 hours prior | 2026-07-30 03:30 | 2,210.82 | 2,220.00 | -9.18 |
| 24 hours prior | 2026-07-29 15:30 | 2,210.84 | 2,220.00 | -9.16 |
| 48 hours prior | 2026-07-28 15:30 | 2,210.88 | 2,220.00 | -9.12 |
*
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
