Granger Lake: 100.0% full as of 2026-08-23

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 2026-08-23 100.0 504.44 53,650 51,822 51,822 - n.a. -
Yesterday 2026-08-22 100.0 504.48 53,818 51,822 51,822 - n.a. -
2 days ago 2026-08-21 100.0 504.53 54,029 51,822 51,822 - n.a. -
1 week ago 2026-08-16 100.0 504.75 54,963 51,822 51,822 - n.a. -
1 month ago 2026-07-23 100.0 506.30 61,844 51,822 51,822 - n.a. -
3 months ago 2026-05-23 100.0 508.20 70,998 51,822 51,822 - n.a. -
6 months ago 2026-02-23 100.0 504.31 53,105 51,822 51,822 - n.a. -
1 year ago 2025-08-23 100.0 504.28 52,980 51,822 51,822 - 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 2026-08-23 17:00 504.42 504.00 0.42 into flood pool
1 hour prior 2026-08-23 16:00 504.43 504.00 0.43 into flood pool
2 hours prior 2026-08-23 15:00 504.43 504.00 0.43 into flood pool
6 hours prior 2026-08-23 11:00 504.44 504.00 0.44 into flood pool
12 hours prior 2026-08-23 05:00 504.45 504.00 0.45 into flood pool
24 hours prior 2026-08-22 17:00 504.47 504.00 0.47 into flood pool
48 hours prior 2026-08-21 17:00 504.52 504.00 0.52 into flood pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1979-01-01
Vertical datum NGVD29
Dead pool elevation 457.00 ft above NGVD29
Emergency spillway crest elevation 528.00 ft above NGVD29
Flood pool elevation 528.00 ft above NGVD29
Maximum design elevation 550.30 ft above NGVD29
Top of dam elevation 555.00 ft above NGVD29
Conservation pool elevation 504.00 ft above NGVD29
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

1979-01-01 (source: USGS)
2008-08-01 (source: TWDB) : GIS Data
2013-03-01 (source: TWDB) : GIS Data
Data Source USGS:08105600
USGS Monitoring Location USGS:08105600

Lake Location