Lake Alan Henry: 100.0% full as of 2020-05-31

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 2020-05-31 100.0 2,221.53 100,574 96,207 96,207 - n.a. -
1 day prior 2020-05-30 100.0 2,221.67 100,982 96,207 96,207 - n.a. -
2 days prior 2020-05-29 100.0 2,221.83 101,450 96,207 96,207 - n.a. -
1 week prior 2020-05-24 100.0 2,221.59 100,749 96,207 96,207 - n.a. -
1 month prior 2020-04-30 97.8 2,219.22 94,044 94,044 96,207 2,745
3 months prior 2020-02-29 92.6 2,217.38 89,113 89,113 96,207 2,615
6 months prior 2019-11-30 94.7 2,218.14 91,120 91,120 96,207 2,669
1 year prior 2019-05-31 96.0 2,218.61 92,383 92,383 96,207 2,702
*

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 2020-05-31 23:30 2,221.47 2,220.00 1.47 into flood pool
1 hour prior 2020-05-31 22:30 2,221.47 2,220.00 1.47 into flood pool
2 hours prior 2020-05-31 21:30 2,221.48 2,220.00 1.48 into flood pool
6 hours prior 2020-05-31 17:30 2,221.50 2,220.00 1.50 into flood pool
12 hours prior 2020-05-31 11:30 2,221.54 2,220.00 1.54 into flood pool
24 hours prior 2020-05-30 23:30 2,221.59 2,220.00 1.59 into flood pool
48 hours prior 2020-05-29 23:30 2,221.75 2,220.00 1.75 into flood pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1994-01-01
Vertical datum NGVD29
Gauge USGS:08079700
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