Somerville Lake: 85.6% full as of 2018-08-16

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 2018-08-16 85.6 235.99 125,990 125,990 147,104 10,190
Yesterday 2018-08-15 85.8 236.01 126,194 126,194 147,104 10,196
2 days ago 2018-08-14 85.9 236.03 126,399 126,399 147,104 10,202
1 week ago 2018-08-09 86.3 236.08 126,909 126,909 147,104 10,216
1 month ago 2018-07-16 92.6 236.98 136,226 136,226 147,104 10,493
3 months ago 2018-05-16 100.0 238.03 147,429 147,104 147,104 10,854
6 months ago 2018-02-16 100.0 238.12 148,408 147,104 147,104 10,887
1 year ago 2017-08-16 96.2 237.48 141,514 141,514 147,104 10,660
*

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 2018-08-16 16:00 235.99 238.0 -2.0 below flood pool
1 hour prior 2018-08-16 15:00 235.98 238.0 -2.0 below flood pool
2 hours prior 2018-08-16 14:00 236.00 238.0 -2.0 below flood pool
6 hours prior 2018-08-16 10:00 235.99 238.0 -2.0 below flood pool
12 hours prior 2018-08-16 04:00 235.99 238.0 -2.0 below flood pool
24 hours prior 2018-08-15 16:00 235.99 238.0 -2.0 below flood pool
48 hours prior 2018-08-14 16:00 236.02 238.0 -2.0 below flood pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1967-01-01
Vertical datum NGVD29
Gauge USGS:08109900
Dead pool elevation 206.0 ft above NGVD29
Emergency spillway crest elevation 258.0 ft above NGVD29
Flood pool elevation 258.0 ft above NGVD29
Maximum design elevation 274.5 ft above NGVD29
Top of dam elevation 280.0 ft above NGVD29
Conservation pool elevation 238.0 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

Lake Location