Lake Alan Henry: 70.7% full as of 2026-10-10
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 | 2026-10-10 | 70.7 | 2,208.37 | 68,021 | 68,021 | 96,207 | 2,113 |
| Yesterday | 2026-10-09 | 70.7 | 2,208.39 | 68,063 | 68,063 | 96,207 | 2,114 |
| 2 days ago | 2026-10-08 | 70.8 | 2,208.42 | 68,127 | 68,127 | 96,207 | 2,116 |
| 1 week ago | 2026-10-03 | 71.1 | 2,208.56 | 68,423 | 68,423 | 96,207 | 2,123 |
| 1 month ago | 2026-09-10 | 72.1 | 2,209.00 | 69,362 | 69,362 | 96,207 | 2,144 |
| 3 months ago | 2026-07-10 | 76.7 | 2,211.04 | 73,828 | 73,828 | 96,207 | 2,239 |
| 6 months ago | 2026-04-10 | 82.4 | 2,213.41 | 79,276 | 79,276 | 96,207 | 2,357 |
| 1 year ago | 2025-10-10 | 91.1 | 2,216.83 | 87,685 | 87,685 | 96,207 | 2,576 |
*
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 | 2026-10-10 05:30 | 2,208.36 | 2,220.00 | -11.64 |
| 1 hour prior | 2026-10-10 04:30 | 2,208.36 | 2,220.00 | -11.64 |
| 2 hours prior | 2026-10-10 03:30 | 2,208.36 | 2,220.00 | -11.64 |
| 6 hours prior | 2026-10-09 23:30 | 2,208.37 | 2,220.00 | -11.63 |
| 12 hours prior | 2026-10-09 17:30 | 2,208.37 | 2,220.00 | -11.63 |
| 24 hours prior | 2026-10-09 05:30 | 2,208.39 | 2,220.00 | -11.61 |
| 48 hours prior | 2026-10-08 05:30 | 2,208.42 | 2,220.00 | -11.58 |
*
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
