Somerville Lake: 87.1% full as of 2026-10-25
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 | 2026-10-25 | 87.1 | 236.21 | 130,869 | 130,869 | 150,293 | 10,506 |
| Yesterday | 2026-10-24 | 87.4 | 236.25 | 131,290 | 131,290 | 150,293 | 10,519 |
| 2 days ago | 2026-10-23 | 87.7 | 236.30 | 131,816 | 131,816 | 150,293 | 10,535 |
| 1 week ago | 2026-10-18 | 89.1 | 236.50 | 133,929 | 133,929 | 150,293 | 10,600 |
| 1 month ago | 2026-09-25 | 90.8 | 236.74 | 136,484 | 136,484 | 150,293 | 10,686 |
| 3 months ago | 2026-07-25 | 100.0 | 239.79 | 171,234 | 150,293 | 150,293 | - n.a. - |
| 6 months ago | 2026-04-25 | 78.7 | 234.99 | 118,323 | 118,323 | 150,293 | 10,046 |
| 1 year ago | 2025-10-25 | 84.4 | 235.83 | 126,902 | 126,902 | 150,293 | 10,374 |
*
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 | 2026-10-25 19:00 | 236.18 | 238.00 | -1.82 |
| 1 hour prior | 2026-10-25 18:00 | 236.18 | 238.00 | -1.82 |
| 2 hours prior | 2026-10-25 17:00 | 236.19 | 238.00 | -1.81 |
| 6 hours prior | 2026-10-25 13:00 | 236.19 | 238.00 | -1.81 |
| 12 hours prior | 2026-10-25 07:00 | 236.22 | 238.00 | -1.78 |
| 24 hours prior | 2026-10-24 19:00 | 236.23 | 238.00 | -1.77 |
| 48 hours prior | 2026-10-23 19:00 | 236.28 | 238.00 | -1.72 |
*
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
