E. V. Spence Reservoir: 10.4% full as of 2026-07-16

The elevation-storage rating curve used to produce the storage hydrograph is made of two segments: (1) the segment up to the conservation pool top (below the red line) is based on measured data, and (2) the segment in the flood pool (above the red line) is an extrapolation from the first segment and shouldn't be relied upon for flood storage information.

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 2026-07-16 10.4 1,843.80 53,891 53,891 517,272 3,466
1 day prior 2026-07-15 10.4 1,843.81 53,925 53,925 517,272 3,468
2 days prior 2026-07-14 10.4 1,843.82 53,960 53,960 517,272 3,469
1 week prior 2026-07-09 10.6 1,844.02 54,657 54,657 517,272 3,501
1 month prior 2026-06-16 11.1 1,844.82 57,514 57,514 517,272 3,644
3 months prior 2026-04-16 11.6 1,845.43 59,790 59,790 517,272 3,794
6 months prior 2026-01-16 12.3 1,846.43 63,639 63,639 517,272 3,900
1 year prior 2025-07-16 15.4 1,850.26 79,656 79,656 517,272 4,480
*

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 2026-07-17 00:00 1,843.78 1,898.00 -54.22
1 hour prior 2026-07-16 23:00 1,843.78 1,898.00 -54.22
2 hours prior 2026-07-16 22:00 1,843.79 1,898.00 -54.21
6 hours prior 2026-07-16 18:00 1,843.81 1,898.00 -54.19
12 hours prior 2026-07-16 12:00 1,843.80 1,898.00 -54.20
24 hours prior 2026-07-16 00:00 1,843.81 1,898.00 -54.19
48 hours prior 2026-07-15 00:00 1,843.80 1,898.00 -54.20
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1969-01-01
Vertical datum NGVD29
Dead pool elevation 1,790.00 ft above NGVD29
Service spillway crest elevation 1,878.00 ft above NGVD29
Emergency spillway crest elevation 1,908.00 ft above NGVD29
Top of dam elevation 1,928.00 ft above NGVD29
Conservation pool elevation 1,898.00 ft above NGVD29
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

1969-01-01 (source: USGS)
1999-07-01 (source: TWDB) : GIS Data
Data Source USGS:08123950
USGS Monitoring Location USGS:08123950

Lake Location