Lake Bob Sandlin: 90.5% full as of 2026-09-11
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 | 2026-09-11 | 90.5 | 335.40 | 184,913 | 174,182 | 192,417 | 8,478 |
| Yesterday | 2026-09-10 | 90.6 | 335.41 | 184,998 | 174,267 | 192,417 | 8,480 |
| 2 days ago | 2026-09-09 | 90.7 | 335.43 | 185,168 | 174,437 | 192,417 | 8,484 |
| 1 week ago | 2026-09-04 | 91.1 | 335.52 | 185,932 | 175,201 | 192,417 | 8,501 |
| 1 month ago | 2026-08-11 | 93.7 | 336.12 | 191,068 | 180,337 | 192,417 | 8,618 |
| 3 months ago | 2026-06-11 | 96.6 | 336.75 | 196,536 | 185,805 | 192,417 | 8,742 |
| 6 months ago | 2026-03-11 | 94.7 | 336.34 | 192,969 | 182,238 | 192,417 | 8,662 |
| 1 year ago | 2025-09-11 | 97.4 | 336.93 | 198,113 | 187,382 | 192,417 | 8,777 |
*
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 | 2026-09-11 22:00 | 335.38 | 337.50 | -2.12 |
| 1 hour prior | 2026-09-11 21:00 | 335.38 | 337.50 | -2.12 |
| 2 hours prior | 2026-09-11 20:00 | 335.38 | 337.50 | -2.12 |
| 6 hours prior | 2026-09-11 16:00 | 335.38 | 337.50 | -2.12 |
| 12 hours prior | 2026-09-11 10:00 | 335.40 | 337.50 | -2.10 |
| 24 hours prior | 2026-09-10 22:00 | 335.40 | 337.50 | -2.10 |
| 48 hours prior | 2026-09-09 22:00 | 335.43 | 337.50 | -2.07 |
*
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
