Lake Alan Henry: 96.6% full as of 2020-08-11

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 2020-08-11 96.6 2,218.81 92,924 92,924 96,207 2,716
1 day prior 2020-08-10 96.7 2,218.84 93,006 93,006 96,207 2,718
2 days prior 2020-08-09 96.8 2,218.89 93,142 93,142 96,207 2,722
1 week prior 2020-08-04 97.4 2,219.08 93,660 93,660 96,207 2,735
1 month prior 2020-07-11 99.6 2,219.87 95,843 95,843 96,207 2,791
3 months prior 2020-05-11 95.7 2,218.51 92,113 92,113 96,207 2,695
6 months prior 2020-02-11 93.2 2,217.58 89,637 89,637 96,207 2,629
1 year prior 2019-08-11 92.7 2,217.42 89,217 89,217 96,207 2,618
*

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 2020-08-11 11:30 2,218.81 2,220.00 -1.19 below flood pool
1 hour prior 2020-08-11 10:30 2,218.79 2,220.00 -1.21 below flood pool
2 hours prior 2020-08-11 09:30 2,218.82 2,220.00 -1.18 below flood pool
6 hours prior 2020-08-11 05:30 2,218.81 2,220.00 -1.19 below flood pool
12 hours prior 2020-08-10 23:30 2,218.82 2,220.00 -1.18 below flood pool
24 hours prior 2020-08-10 11:30 2,218.85 2,220.00 -1.15 below flood pool
48 hours prior 2020-08-09 11:30 2,218.89 2,220.00 -1.11 below 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