Lewisville Lake: 85.1% full as of 2026-09-17
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 | 2026-09-17 | 85.1 | 518.78 | 515,243 | 479,569 | 563,228 | 24,948 |
| Yesterday | 2026-09-16 | 85.3 | 518.82 | 516,241 | 480,567 | 563,228 | 24,977 |
| 2 days ago | 2026-09-15 | 85.5 | 518.86 | 517,241 | 481,567 | 563,228 | 25,006 |
| 1 week ago | 2026-09-10 | 86.7 | 519.14 | 524,270 | 488,596 | 563,228 | 25,203 |
| 1 month ago | 2026-08-17 | 92.7 | 520.45 | 557,839 | 522,165 | 563,228 | 26,016 |
| 3 months ago | 2026-06-17 | 100.0 | 523.16 | 630,702 | 563,228 | 563,228 | - n.a. - |
| 6 months ago | 2026-03-17 | 100.0 | 522.08 | 601,064 | 563,228 | 563,228 | - n.a. - |
| 1 year ago | 2025-09-17 | 93.3 | 520.57 | 560,964 | 525,290 | 563,228 | 26,086 |
*
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 | 2026-09-17 18:15 | 518.76 | 522.00 | -3.24 |
| 1 hour prior | 2026-09-17 17:15 | 518.76 | 522.00 | -3.24 |
| 2 hours prior | 2026-09-17 16:15 | 518.76 | 522.00 | -3.24 |
| 6 hours prior | 2026-09-17 12:15 | 518.75 | 522.00 | -3.25 |
| 12 hours prior | 2026-09-17 06:15 | 518.80 | 522.00 | -3.20 |
| 24 hours prior | 2026-09-16 18:15 | 518.80 | 522.00 | -3.20 |
| 48 hours prior | 2026-09-15 18:15 | 518.87 | 522.00 | -3.13 |
*
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
