Lewisville Lake: 98.7% full as of 2017-09-21

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 2017-09-21 98.7 521.73 591,633 555,959 563,228 26,817
Yesterday 2017-09-20 98.9 521.76 592,438 556,764 563,228 26,840
2 days ago 2017-09-19 99.0 521.80 593,510 557,836 563,228 26,870
1 week ago 2017-09-14 100.0 522.01 599,172 563,228 563,228 - n.a. -
1 month ago 2017-08-21 100.0 522.12 602,147 563,228 563,228 - n.a. -
3 months ago 2017-06-21 100.0 522.25 605,675 563,228 563,228 - n.a. -
6 months ago 2017-03-21 99.2 521.84 594,587 558,913 563,228 26,903
1 year ago 2016-09-21 97.8 521.54 586,550 550,876 563,228 26,682
*

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 2017-09-21 15:15 521.71 522.0 -0.3 below flood pool
1 hour prior 2017-09-21 14:15 521.71 522.0 -0.3 below flood pool
2 hours prior 2017-09-21 13:15 521.71 522.0 -0.3 below flood pool
6 hours prior 2017-09-21 09:15 521.73 522.0 -0.3 below flood pool
12 hours prior 2017-09-21 03:15 521.73 522.0 -0.3 below flood pool
24 hours prior 2017-09-20 15:15 521.75 522.0 -0.2 below flood pool
48 hours prior 2017-09-19 15:15 521.80 522.0 -0.2 below flood pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1955-01-01
Vertical datum NGVD29
Gauge USGS:08052800
Dead pool elevation 481.0 ft above NGVD29
Emergency spillway crest elevation 532.0 ft above NGVD29
Flood pool elevation 532.0 ft above NGVD29
Maximum design elevation 552.1 ft above NGVD29
Maximum design elevation 553.0 ft above NGVD29
Top of dam elevation 560.0 ft above NGVD29
Conservation pool elevation 522.0 ft above NGVD29
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

2007-09-01 (source: twdb) : GIS Data

Lake Location