Lake Alan Henry: 73.0% full as of 2026-10-28

Historical Data

Date Percent Full Mean Water Level
(ft) 		Reservoir Storage
(acre-ft) 		Conservation Storage
(acre-ft) 		Conservation Capacity
(acre-ft) 		Surface Area
(acres)
Most recent 2026-10-28 73.0 2,209.39 70,201 70,201 96,207 2,161
1 day prior 2026-10-27 73.0 2,209.41 70,245 70,245 96,207 2,162
2 days prior 2026-10-26 73.1 2,209.43 70,288 70,288 96,207 2,163
1 week prior 2026-10-21 73.4 2,209.59 70,634 70,634 96,207 2,170
1 month prior 2026-09-28 71.5 2,208.73 68,785 68,785 96,207 2,131
3 months prior 2026-07-28 76.4 2,210.90 73,516 73,516 96,207 2,231
6 months prior 2026-04-28 81.4 2,212.99 78,290 78,290 96,207 2,338
1 year prior 2025-10-28 89.8 2,216.33 86,406 86,406 96,207 2,541
*

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 2026-10-28 23:30 2,209.38 2,220.00 -10.62
1 hour prior 2026-10-28 22:30 2,209.38 2,220.00 -10.62
2 hours prior 2026-10-28 21:30 2,209.38 2,220.00 -10.62
6 hours prior 2026-10-28 17:30 2,209.39 2,220.00 -10.61
12 hours prior 2026-10-28 11:30 2,209.39 2,220.00 -10.61
24 hours prior 2026-10-27 23:30 2,209.40 2,220.00 -10.60
48 hours prior 2026-10-26 23:30 2,209.43 2,220.00 -10.57
*

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