Somerville Lake: 100.0% full as of 2021-05-14

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 2021-05-14 100.0 238.19 152,440 150,293 150,293 - n.a. -
Yesterday 2021-05-13 100.0 238.22 152,781 150,293 150,293 - n.a. -
2 days ago 2021-05-12 100.0 238.28 153,464 150,293 150,293 - n.a. -
1 week ago 2021-05-07 100.0 238.54 156,444 150,293 150,293 - n.a. -
1 month ago 2021-04-14 85.2 235.94 128,045 128,045 150,293 10,414
3 months ago 2021-02-14 84.4 235.82 126,798 126,798 150,293 10,370
6 months ago 2020-11-14 84.2 235.80 126,590 126,590 150,293 10,363
1 year ago 2020-05-14 100.0 238.17 152,213 150,293 150,293 - 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 2021-05-14 21:00 238.18 238.00 0.18 into flood pool
1 hour prior 2021-05-14 20:00 238.18 238.00 0.18 into flood pool
2 hours prior 2021-05-14 19:00 238.18 238.00 0.18 into flood pool
6 hours prior 2021-05-14 15:00 238.18 238.00 0.18 into flood pool
12 hours prior 2021-05-14 09:00 238.18 238.00 0.18 into flood pool
24 hours prior 2021-05-13 21:00 238.20 238.00 0.20 into flood pool
48 hours prior 2021-05-12 21:00 238.26 238.00 0.26 into 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 206.00 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

Lake Location