Lake Alan Henry: 75.0% full as of 2022-11-29

The elevation-storage rating curve used to produce the storage hydrograph is made of two segments: (1) the segment up to the conservation pool top (below the red line) is based on measured data, and (2) the segment in the flood pool (above the red line) is an extrapolation from the first segment and shouldn't be relied upon for flood storage information.

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 2022-11-29 75.0 2,210.28 72,142 72,142 96,207 2,200
Yesterday 2022-11-28 75.0 2,210.29 72,164 72,164 96,207 2,201
2 days ago 2022-11-27 75.0 2,210.27 72,120 72,120 96,207 2,200
1 week ago 2022-11-22 74.7 2,210.14 71,834 71,834 96,207 2,194
1 month ago 2022-10-29 75.9 2,210.69 73,048 73,048 96,207 2,220
3 months ago 2022-08-29 76.6 2,211.00 73,739 73,739 96,207 2,236
6 months ago 2022-05-29 81.9 2,213.19 78,759 78,759 96,207 2,347
1 year ago 2021-11-29 91.4 2,216.93 87,943 87,943 96,207 2,583
*

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 2022-11-29 18:30 2,210.27 2,220.00 -9.73
1 hour prior 2022-11-29 17:30 2,210.25 2,220.00 -9.75
2 hours prior 2022-11-29 16:30 2,210.29 2,220.00 -9.71
6 hours prior 2022-11-29 12:30 2,210.30 2,220.00 -9.70
12 hours prior 2022-11-29 06:30 2,210.29 2,220.00 -9.71
24 hours prior 2022-11-28 18:30 2,210.29 2,220.00 -9.71
48 hours prior 2022-11-27 18:30 2,210.28 2,220.00 -9.72
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1994-01-01
Gauge USGS:08079700
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)
1994-01-01 (source: USGS)
2005-07-01 (source: TWDB) : GIS Data
2017-08-01 (source: TWDB) : GIS Data

Lake Location