Moss Lake: 90.8% full as of 2026-09-13

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 2026-09-13 90.8 712.89 21,930 21,833 24,058 1,028
Yesterday 2026-09-12 90.8 712.91 21,951 21,854 24,058 1,029
2 days ago 2026-09-11 90.9 712.93 21,972 21,875 24,058 1,029
1 week ago 2026-09-06 91.4 713.03 22,075 21,978 24,058 1,032
1 month ago 2026-08-13 94.3 713.71 22,782 22,685 24,058 1,048
3 months ago 2026-06-13 91.9 713.15 22,199 22,102 24,058 1,035
6 months ago 2026-03-13 90.3 712.78 21,817 21,720 24,058 1,026
1 year ago 2025-09-13 94.0 713.64 22,708 22,611 24,058 1,047
*

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 2026-09-13 18:15 712.88 715.00 -2.12
1 hour prior 2026-09-13 17:15 712.88 715.00 -2.12
2 hours prior 2026-09-13 16:15 712.88 715.00 -2.12
6 hours prior 2026-09-13 12:15 712.89 715.00 -2.11
12 hours prior 2026-09-13 06:15 712.89 715.00 -2.11
24 hours prior 2026-09-12 18:15 712.90 715.00 -2.10
48 hours prior 2026-09-11 18:15 712.93 715.00 -2.07
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1966-01-01
Vertical datum NGVD29
Dead pool elevation 666.00 ft above NGVD29
Service spillway crest elevation 715.00 ft above NGVD29
Emergency spillway crest elevation 725.00 ft above NGVD29
Top of dam elevation 740.00 ft above NGVD29
Conservation pool elevation 715.00 ft above NGVD29
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

1966-01-01 (source: USGS)
1999-05-01 (source: TWDB) : GIS Data
Data Source USGS:07315950
USGS Monitoring Location USGS:07315950

Lake Location