Somerville Lake: 72.8% full as of 2026-04-01

The elevation-storage rating curve used to produce the storage hydrograph is made of two segments: (1) the segment up to the conservation pool top (below the red line) is based on measured data, and (2) the segment in the flood pool (above the red line) is an extrapolation from the first segment and shouldn't be relied upon for flood storage information.

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 2026-04-01 72.8 234.09 109,460 109,460 150,293 9,646
Yesterday 2026-03-31 73.0 234.11 109,653 109,653 150,293 9,654
2 days ago 2026-03-30 73.5 234.20 110,523 110,523 150,293 9,693
1 week ago 2026-03-25 76.6 234.67 115,130 115,130 150,293 9,910
1 month ago 2026-03-01 78.1 234.90 117,421 117,421 150,293 10,010
3 months ago 2026-01-01 79.2 235.06 119,028 119,028 150,293 10,073
6 months ago 2025-10-01 93.2 237.08 140,140 140,140 150,293 10,824
1 year ago 2025-04-01 84.9 235.89 127,524 127,524 150,293 10,396
*

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 2026-04-01 21:00 234.07 238.00 -3.93 below flood pool
1 hour prior 2026-04-01 20:00 234.08 238.00 -3.92 below flood pool
2 hours prior 2026-04-01 19:00 234.07 238.00 -3.93 below flood pool
6 hours prior 2026-04-01 15:00 234.09 238.00 -3.91 below flood pool
12 hours prior 2026-04-01 09:00 234.09 238.00 -3.91 below flood pool
24 hours prior 2026-03-31 21:00 234.10 238.00 -3.90 below flood pool
48 hours prior 2026-03-30 21:00 234.16 238.00 -3.84 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

Lake Location