Somerville Lake: 93.4% full as of 2026-09-06

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 2026-09-06 93.4 237.10 140,356 140,356 150,293 10,832
Yesterday 2026-09-05 93.4 237.10 140,356 140,356 150,293 10,832
2 days ago 2026-09-04 93.6 237.13 140,682 140,682 150,293 10,845
1 week ago 2026-08-30 96.3 237.50 144,723 144,723 150,293 11,009
1 month ago 2026-08-06 100.0 238.37 154,491 150,293 150,293 - n.a. -
3 months ago 2026-06-06 100.0 238.41 154,949 150,293 150,293 - n.a. -
6 months ago 2026-03-06 77.9 234.87 117,121 117,121 150,293 9,997
1 year ago 2025-09-06 96.9 237.58 145,606 145,606 150,293 11,047
*

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 2026-09-06 00:00 237.10 238.00 -0.90 below flood pool
1 hour prior 2026-09-05 23:00 237.09 238.00 -0.91 below flood pool
2 hours prior 2026-09-05 22:00 237.10 238.00 -0.90 below flood pool
6 hours prior 2026-09-05 18:00 237.07 238.00 -0.93 below flood pool
12 hours prior 2026-09-05 12:00 237.11 238.00 -0.89 below flood pool
24 hours prior 2026-09-05 00:00 237.11 238.00 -0.89 below flood pool
48 hours prior 2026-09-04 00:00 237.16 238.00 -0.84 below flood pool
*

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