Whitney Lake: 96.6% full as of 2026-08-20

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 2026-08-20 96.6 532.17 547,207 545,853 564,808 22,456
Yesterday 2026-08-19 96.7 532.19 547,656 546,302 564,808 22,475
2 days ago 2026-08-18 96.9 532.24 548,781 547,427 564,808 22,521
1 week ago 2026-08-13 97.5 532.38 551,943 550,589 564,808 22,650
1 month ago 2026-07-20 100.0 533.12 568,956 564,808 564,808 - n.a. -
3 months ago 2026-05-20 97.9 532.49 554,440 553,086 564,808 22,751
6 months ago 2026-02-20 94.2 531.54 533,242 531,888 564,808 21,877
1 year ago 2025-08-20 100.0 533.01 566,394 564,808 564,808 - 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 2026-08-20 15:15 532.17 533.00 -0.83 below flood pool
1 hour prior 2026-08-20 14:15 532.17 533.00 -0.83 below flood pool
2 hours prior 2026-08-20 13:15 532.17 533.00 -0.83 below flood pool
6 hours prior 2026-08-20 09:15 532.16 533.00 -0.84 below flood pool
12 hours prior 2026-08-20 03:15 532.17 533.00 -0.83 below flood pool
24 hours prior 2026-08-19 15:15 532.19 533.00 -0.81 below flood pool
48 hours prior 2026-08-18 15:15 532.24 533.00 -0.76 below flood pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1951-01-01
Vertical datum NGVD29
Dead pool elevation 448.83 ft above NGVD29
Service spillway crest elevation 533.00 ft above NGVD29
Top of flood gate elevation 571.00 ft above NGVD29
Emergency spillway crest elevation 571.00 ft above NGVD29
Flood pool elevation 571.00 ft above NGVD29
Maximum design elevation 573.00 ft above NGVD29
Top of dam elevation 584.00 ft above NGVD29
Conservation pool elevation
Start date: 1972-03-01 		533.00 ft above NGVD29
Conservation pool elevation
Start date to end date: 1969-03-01 to 1972-02-29 		523.00 ft above NGVD29
Conservation pool elevation
Start date to end date: 1968-03-01 to 1969-02-28 		522.00 ft above NGVD29
Conservation pool elevation
End date: 1968-02-29 		520.00 ft above NGVD29
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

1959-01-01 (source: USACE)
2005-06-01 (source: TWDB) : GIS Data
Data Source USGS:08092500
USGS Monitoring Location USGS:08092500

Lake Location