Lewisville Lake: 85.5% full as of 2026-09-15

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 2026-09-15 85.5 518.86 517,241 481,567 563,228 25,006
1 day prior 2026-09-14 85.8 518.92 518,743 483,069 563,228 25,049
2 days prior 2026-09-13 86.1 518.99 520,498 484,824 563,228 25,099
1 week prior 2026-09-08 87.2 519.25 527,047 491,373 563,228 25,278
1 month prior 2026-08-15 93.2 520.55 560,442 524,768 563,228 26,075
3 months prior 2026-06-15 100.0 523.33 635,441 563,228 563,228 - n.a. -
6 months prior 2026-03-15 100.0 522.36 608,670 563,228 563,228 - n.a. -
1 year prior 2025-09-15 93.5 520.63 562,530 526,856 563,228 26,122
*

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 2026-09-15 23:15 518.85 522.00 -3.15 below flood pool
1 hour prior 2026-09-15 22:15 518.83 522.00 -3.17 below flood pool
2 hours prior 2026-09-15 21:15 518.83 522.00 -3.17 below flood pool
6 hours prior 2026-09-15 17:15 518.87 522.00 -3.13 below flood pool
12 hours prior 2026-09-15 11:15 518.86 522.00 -3.14 below flood pool
24 hours prior 2026-09-14 23:15 518.90 522.00 -3.10 below flood pool
48 hours prior 2026-09-13 23:15 518.97 522.00 -3.03 below 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