Somerville Lake: 90.2% full as of 2026-09-29
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 | 2026-09-29 | 90.2 | 236.65 | 135,524 | 135,524 | 150,293 | 10,652 |
| Yesterday | 2026-09-28 | 90.3 | 236.67 | 135,737 | 135,737 | 150,293 | 10,659 |
| 2 days ago | 2026-09-27 | 90.5 | 236.70 | 136,056 | 136,056 | 150,293 | 10,670 |
| 1 week ago | 2026-09-22 | 91.2 | 236.79 | 137,018 | 137,018 | 150,293 | 10,705 |
| 1 month ago | 2026-08-29 | 96.8 | 237.57 | 145,496 | 145,496 | 150,293 | 11,042 |
| 3 months ago | 2026-06-29 | 100.0 | 239.55 | 168,335 | 150,293 | 150,293 | - n.a. - |
| 6 months ago | 2026-03-29 | 74.2 | 234.30 | 111,495 | 111,495 | 150,293 | 9,738 |
| 1 year ago | 2025-09-29 | 93.5 | 237.12 | 140,573 | 140,573 | 150,293 | 10,841 |
*
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 | 2026-09-29 19:00 | 236.65 | 238.00 | -1.35 |
| 1 hour prior | 2026-09-29 18:00 | 236.58 | 238.00 | -1.42 |
| 2 hours prior | 2026-09-29 17:00 | 236.64 | 238.00 | -1.36 |
| 6 hours prior | 2026-09-29 13:00 | 236.65 | 238.00 | -1.35 |
| 12 hours prior | 2026-09-29 07:00 | 236.65 | 238.00 | -1.35 |
| 24 hours prior | 2026-09-28 19:00 | 236.65 | 238.00 | -1.35 |
| 48 hours prior | 2026-09-27 19:00 | 236.69 | 238.00 | -1.31 |
*
Data is provisional and subject to revision.
Additional Information
| Impoundment date | 1967-01-01 |
| Vertical datum | NGVD29 |
| Dead pool elevation | 206.00 ft above NGVD29 |
| Emergency spillway crest elevation | 258.00 ft above NGVD29 |
| Flood pool elevation | 258.00 ft above NGVD29 |
| Maximum design elevation | 274.50 ft above NGVD29 |
| Top of dam elevation | 280.00 ft above NGVD29 |
| Conservation pool elevation | 238.00 ft above NGVD29 |
| Data download (CSV) | period of record, last one year, last 30 days |
Elevation-Area-Capacity Curves
1967-01-01 (source: USGS)
2003-07-01 (source: TWDB)
: GIS Data
2012-04-01 (source: TWDB)
: GIS Data
|
|
| Data Source | USGS:08109900 |
| USGS Monitoring Location | USGS:08109900 |
Lake Location
