Somerville Lake: 95.3% full as of 2026-09-01
Historical Data
| Date | Percent Full |
Mean Water Level (ft) |
Reservoir Storage (acre-ft) |
Conservation Storage (acre-ft) |
Conservation Capacity (acre-ft) |
Surface Area (acres) |
|
|---|---|---|---|---|---|---|---|
| Most recent | 2026-09-01 | 95.3 | 237.37 | 143,297 | 143,297 | 150,293 | 10,949 |
| 1 day prior | 2026-08-31 | 95.8 | 237.43 | 143,954 | 143,954 | 150,293 | 10,976 |
| 2 days prior | 2026-08-30 | 96.3 | 237.50 | 144,723 | 144,723 | 150,293 | 11,009 |
| 1 week prior | 2026-08-25 | 97.8 | 237.70 | 146,935 | 146,935 | 150,293 | 11,107 |
| 1 month prior | 2026-08-01 | 100.0 | 239.02 | 162,032 | 150,293 | 150,293 | - n.a. - |
| 3 months prior | 2026-06-01 | 100.0 | 238.36 | 154,377 | 150,293 | 150,293 | - n.a. - |
| 6 months prior | 2026-03-01 | 78.1 | 234.90 | 117,421 | 117,421 | 150,293 | 10,010 |
| 1 year prior | 2025-09-01 | 97.4 | 237.65 | 146,381 | 146,381 | 150,293 | 11,082 |
*
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 | 2026-09-02 00:00 | 237.31 | 238.00 | -0.69 |
| 1 hour prior | 2026-09-01 23:00 | 237.30 | 238.00 | -0.70 |
| 2 hours prior | 2026-09-01 22:00 | 237.32 | 238.00 | -0.68 |
| 6 hours prior | 2026-09-01 18:00 | 237.32 | 238.00 | -0.68 |
| 12 hours prior | 2026-09-01 12:00 | 237.36 | 238.00 | -0.64 |
| 24 hours prior | 2026-09-01 00:00 | 237.40 | 238.00 | -0.60 |
| 48 hours prior | 2026-08-31 00:00 | 237.47 | 238.00 | -0.53 |
*
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
