Lewisville Lake: 100.0% full as of 2026-04-20

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)
Most recent 2026-04-20 100.0 522.08 601,064 563,228 563,228 - n.a. -
1 day prior 2026-04-19 100.0 522.11 601,876 563,228 563,228 - n.a. -
2 days prior 2026-04-18 100.0 522.15 602,961 563,228 563,228 - n.a. -
1 week prior 2026-04-13 100.0 522.22 604,860 563,228 563,228 - n.a. -
1 month prior 2026-03-20 100.0 522.09 601,335 563,228 563,228 - n.a. -
3 months prior 2026-01-20 97.5 521.47 584,685 549,011 563,228 26,635
6 months prior 2025-10-20 92.8 520.47 558,359 522,685 563,228 26,028
1 year prior 2025-04-20 92.1 520.32 554,461 518,787 563,228 25,941
*

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 2026-04-20 15:15 522.09 522.00 0.09 into flood pool
1 hour prior 2026-04-20 14:15 522.08 522.00 0.08 into flood pool
2 hours prior 2026-04-20 13:15 522.07 522.00 0.07 into flood pool
6 hours prior 2026-04-20 09:15 522.09 522.00 0.09 into flood pool
12 hours prior 2026-04-20 03:15 522.10 522.00 0.10 into flood pool
24 hours prior 2026-04-19 15:15 522.10 522.00 0.10 into flood pool
48 hours prior 2026-04-18 15:15 522.10 522.00 0.10 into flood pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1955-01-01
Vertical datum NGVD29
Dead pool elevation 481.00 ft above NGVD29
Emergency spillway crest elevation 532.00 ft above NGVD29
Flood pool elevation 532.00 ft above NGVD29
Maximum design elevation 552.14 ft above NGVD29
Maximum design elevation 553.00 ft above NGVD29
Top of dam elevation 560.00 ft above NGVD29
Conservation pool elevation 522.00 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
Data Source USGS:08052800
USGS Monitoring Location USGS:08052800

Lake Location