Lake Jacksonville: 97.3% full as of 2026-09-14

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 2026-09-14 97.3 421.40 25,041 24,979 25,670 1,142
1 day prior 2026-09-13 97.4 421.42 25,064 25,002 25,670 1,142
2 days prior 2026-09-12 97.5 421.44 25,087 25,025 25,670 1,143
1 week prior 2026-09-07 97.9 421.53 25,190 25,128 25,670 1,146
1 month prior 2026-08-14 97.1 421.35 24,984 24,922 25,670 1,140
3 months prior 2026-06-14 100.0 421.99 25,720 25,658 25,670 1,163
6 months prior 2026-03-14 100.0 422.14 25,895 25,670 25,670 - n.a. -
1 year prior 2025-09-14 100.0 422.08 25,825 25,670 25,670 - 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 2026-09-14 23:15 421.39 422.00 -0.61
1 hour prior 2026-09-14 22:15 421.39 422.00 -0.61
2 hours prior 2026-09-14 21:15 421.40 422.00 -0.60
6 hours prior 2026-09-14 17:15 421.41 422.00 -0.59
12 hours prior 2026-09-14 11:15 421.40 422.00 -0.60
24 hours prior 2026-09-13 23:15 421.40 422.00 -0.60
48 hours prior 2026-09-12 23:15 421.42 422.00 -0.58
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1957-01-01
Vertical datum NGVD29
Dead pool elevation 372.00 ft above NGVD29
Service spillway crest elevation 422.00 ft above NGVD29
Emergency spillway crest elevation 431.00 ft above NGVD29
Top of dam elevation 438.00 ft above NGVD29
Conservation pool elevation 422.00 ft above NGVD29
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

1957-01-01 (source: USGS)
2006-05-01 (source: TWDB) : GIS Data
Data Source USGS:08032200
USGS Monitoring Location USGS:08032200

Lake Location