Granger Lake: 99.1% full as of 2026-10-04

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 2026-10-04 99.1 503.89 51,372 51,372 51,822 4,084
1 day prior 2026-10-03 98.4 503.80 51,005 51,005 51,822 4,062
2 days prior 2026-10-02 97.9 503.73 50,722 50,722 51,822 4,045
1 week prior 2026-09-27 97.7 503.71 50,641 50,641 51,822 4,041
1 month prior 2026-09-04 100.0 504.13 52,358 51,822 51,822 - n.a. -
3 months prior 2026-07-04 100.0 505.68 59,029 51,822 51,822 - n.a. -
6 months prior 2026-04-04 100.0 504.35 53,273 51,822 51,822 - n.a. -
1 year prior 2025-10-04 98.1 503.76 50,843 50,843 51,822 4,052
*

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 2026-10-04 22:00 503.93 504.00 -0.07 below flood pool
1 hour prior 2026-10-04 21:00 503.93 504.00 -0.07 below flood pool
2 hours prior 2026-10-04 20:00 503.92 504.00 -0.08 below flood pool
6 hours prior 2026-10-04 16:00 503.91 504.00 -0.09 below flood pool
12 hours prior 2026-10-04 10:00 503.88 504.00 -0.12 below flood pool
24 hours prior 2026-10-03 22:00 503.85 504.00 -0.15 below flood pool
48 hours prior 2026-10-02 22:00 503.74 504.00 -0.26 below 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