Somerville Lake: 100.0% full as of 2026-08-12
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 | 2026-08-12 | 100.0 | 238.03 | 150,631 | 150,293 | 150,293 | - n.a. - |
| Yesterday | 2026-08-11 | 100.0 | 238.05 | 150,856 | 150,293 | 150,293 | - n.a. - |
| 2 days ago | 2026-08-10 | 100.0 | 238.08 | 151,194 | 150,293 | 150,293 | - n.a. - |
| 1 week ago | 2026-08-05 | 100.0 | 238.50 | 155,983 | 150,293 | 150,293 | - n.a. - |
| 1 month ago | 2026-07-12 | 100.0 | 238.97 | 161,445 | 150,293 | 150,293 | - n.a. - |
| 3 months ago | 2026-05-12 | 90.6 | 236.71 | 136,163 | 136,163 | 150,293 | 10,674 |
| 6 months ago | 2026-02-12 | 78.5 | 234.96 | 118,022 | 118,022 | 150,293 | 10,034 |
| 1 year ago | 2025-08-12 | 100.0 | 238.02 | 150,518 | 150,293 | 150,293 | - n.a. - |
*
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 | 2026-08-12 19:00 | 238.00 | 238.00 | 0.00 |
| 1 hour prior | 2026-08-12 18:00 | 238.01 | 238.00 | 0.01 |
| 2 hours prior | 2026-08-12 17:00 | 238.01 | 238.00 | 0.01 |
| 6 hours prior | 2026-08-12 13:00 | 238.02 | 238.00 | 0.02 |
| 12 hours prior | 2026-08-12 07:00 | 238.03 | 238.00 | 0.03 |
| 24 hours prior | 2026-08-11 19:00 | 238.03 | 238.00 | 0.03 |
| 48 hours prior | 2026-08-10 19:00 | 238.07 | 238.00 | 0.07 |
*
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
