Lake Alan Henry: 75.0% full as of 2022-11-27

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)
Most recent 2022-11-27 75.0 2,210.27 72,120 72,120 96,207 2,200
1 day prior 2022-11-26 74.8 2,210.20 71,966 71,966 96,207 2,197
2 days prior 2022-11-25 74.6 2,210.13 71,813 71,813 96,207 2,193
1 week prior 2022-11-20 74.7 2,210.17 71,900 71,900 96,207 2,195
1 month prior 2022-10-27 75.1 2,210.34 72,274 72,274 96,207 2,203
3 months prior 2022-08-27 76.6 2,210.98 73,694 73,694 96,207 2,235
6 months prior 2022-05-27 82.0 2,213.25 78,900 78,900 96,207 2,350
1 year prior 2021-11-27 91.4 2,216.94 87,969 87,969 96,207 2,584
*

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 2022-11-28 01:30 2,210.29 2,220.00 -9.71
1 hour prior 2022-11-28 00:30 2,210.28 2,220.00 -9.72
2 hours prior 2022-11-27 23:30 2,210.29 2,220.00 -9.71
6 hours prior 2022-11-27 19:30 2,210.29 2,220.00 -9.71
12 hours prior 2022-11-27 13:30 2,210.28 2,220.00 -9.72
24 hours prior 2022-11-27 01:30 2,210.25 2,220.00 -9.75
48 hours prior 2022-11-26 01:30 2,210.16 2,220.00 -9.84
*

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