Lake Austin: 97.3% full as of 2026-08-11

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 2026-08-11 97.3 492.38 23,922 23,313 23,972 1,556
1 day prior 2026-08-10 96.9 492.33 23,845 23,236 23,972 1,553
2 days prior 2026-08-09 96.5 492.26 23,736 23,127 23,972 1,549
1 week prior 2026-08-04 97.4 492.40 23,953 23,344 23,972 1,557
1 month prior 2026-07-11 96.5 492.27 23,752 23,143 23,972 1,549
3 months prior 2026-05-11 96.7 492.29 23,783 23,174 23,972 1,550
6 months prior 2026-02-11 97.4 492.41 23,969 23,360 23,972 1,557
1 year prior 2025-08-11 96.0 492.18 23,612 23,003 23,972 1,544
*

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 2026-08-11 23:30 492.39 492.80 -0.41
1 hour prior 2026-08-11 22:30 492.38 492.80 -0.42
2 hours prior 2026-08-11 21:30 492.35 492.80 -0.45
6 hours prior 2026-08-11 17:30 492.25 492.80 -0.55
12 hours prior 2026-08-11 11:30 492.33 492.80 -0.47
24 hours prior 2026-08-10 23:30 492.52 492.80 -0.28
48 hours prior 2026-08-09 23:30 492.46 492.80 -0.34
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1939-01-01
Vertical datum NGVD29 -0.04
Dead pool elevation 462.00 ft above NGVD29 -0.04
Service spillway crest elevation 480.00 ft above NGVD29
Top of gate elevation 498.00 ft above NGVD29
Emergency spillway crest elevation 492.80 ft above NGVD29
Maximum design elevation 512.00 ft above NGVD29
Top of dam elevation 519.00 ft above NGVD29
Conservation pool elevation 492.80 ft above NGVD29 -0.04
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

2008-12-01 (source: TWDB) : GIS Data
Data Source LCRA:3999

Lake Location