Lake Bob Sandlin: 97.7% full as of 2019-08-21

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 2019-08-21 97.7 336.99 198,640 187,909 192,417 8,789
1 day prior 2019-08-20 97.7 337.00 198,728 187,997 192,417 8,791
2 days prior 2019-08-19 97.8 337.03 198,992 188,261 192,417 8,796
1 week prior 2019-08-14 98.3 337.14 199,961 189,230 192,417 8,818
1 month prior 2019-07-21 99.8 337.45 202,704 191,973 192,417 8,879
3 months prior 2019-05-21 100.0 337.95 207,167 192,417 192,417 - n.a. -
6 months prior 2019-02-21 100.0 338.09 208,426 192,417 192,417 - n.a. -
1 year prior 2018-08-21 94.7 336.34 192,969 182,238 192,417 8,662
*

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 2019-08-21 22:00 336.98 337.50 -0.52 below flood pool
1 hour prior 2019-08-21 21:00 336.98 337.50 -0.52 below flood pool
2 hours prior 2019-08-21 20:00 336.98 337.50 -0.52 below flood pool
6 hours prior 2019-08-21 16:00 336.98 337.50 -0.52 below flood pool
12 hours prior 2019-08-21 10:00 336.99 337.50 -0.51 below flood pool
24 hours prior 2019-08-20 22:00 336.99 337.50 -0.51 below flood pool
48 hours prior 2019-08-19 22:00 337.02 337.50 -0.48 below flood pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1978-01-01
Vertical datum NGVD29
Gauge USGS:07344489
Dead pool elevation 300.00 ft above NGVD29
Service spillway crest elevation 316.50 ft above NGVD29
Top of flood gate elevation 339.00 ft above NGVD29
Emergency spillway crest elevation 341.30 ft above NGVD29
Maximum design elevation 345.60 ft above NGVD29
Top of dam elevation 349.00 ft above NGVD29
Conservation pool elevation 337.50 ft above NGVD29
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

1978-01-01 (source: usgs)
2000-10-01 (source: usgs)
2008-11-01 (source: twdb) : GIS Data
2018-02-01 (source: twdb) : GIS Data

Lake Location