Lake Bob Sandlin: 90.0% full as of 2026-09-17
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 | 2026-09-17 | 90.0 | 335.28 | 183,897 | 173,166 | 192,417 | 8,454 |
| Yesterday | 2026-09-16 | 90.0 | 335.29 | 183,982 | 173,251 | 192,417 | 8,456 |
| 2 days ago | 2026-09-15 | 90.1 | 335.31 | 184,151 | 173,420 | 192,417 | 8,460 |
| 1 week ago | 2026-09-10 | 90.6 | 335.41 | 184,998 | 174,267 | 192,417 | 8,480 |
| 1 month ago | 2026-08-17 | 93.0 | 335.95 | 189,606 | 178,875 | 192,417 | 8,585 |
| 3 months ago | 2026-06-17 | 96.7 | 336.79 | 196,886 | 186,155 | 192,417 | 8,750 |
| 6 months ago | 2026-03-17 | 94.3 | 336.25 | 192,190 | 181,459 | 192,417 | 8,644 |
| 1 year ago | 2025-09-17 | 97.0 | 336.85 | 197,412 | 186,681 | 192,417 | 8,761 |
*
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 | 2026-09-17 00:00 | 335.28 | 337.50 | -2.22 |
| 1 hour prior | 2026-09-16 23:00 | 335.28 | 337.50 | -2.22 |
| 2 hours prior | 2026-09-16 22:00 | 335.28 | 337.50 | -2.22 |
| 6 hours prior | 2026-09-16 18:00 | 335.29 | 337.50 | -2.21 |
| 12 hours prior | 2026-09-16 12:00 | 335.29 | 337.50 | -2.21 |
| 24 hours prior | 2026-09-16 00:00 | 335.30 | 337.50 | -2.20 |
| 48 hours prior | 2026-09-15 00:00 | 335.33 | 337.50 | -2.17 |
*
Data is provisional and subject to revision.
Additional Information
| Impoundment date | 1978-01-01 |
| Vertical datum | NGVD29 |
| Dead pool elevation | 300.00 ft above NGVD29 |
| Service spillway crest elevation | 316.50 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
|
|
| Data Source | USGS:07344489 |
| USGS Monitoring Location | USGS:07344489 |
Lake Location
