Lake Austin: 96.7% full as of 2026-09-20
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 | 2026-09-20 | 96.7 | 492.30 | 23,798 | 23,189 | 23,972 | 1,551 |
| Yesterday | 2026-09-19 | 96.5 | 492.26 | 23,736 | 23,127 | 23,972 | 1,549 |
| 2 days ago | 2026-09-18 | 96.6 | 492.28 | 23,767 | 23,158 | 23,972 | 1,550 |
| 1 week ago | 2026-09-13 | 97.9 | 492.48 | 24,078 | 23,469 | 23,972 | 1,562 |
| 1 month ago | 2026-08-20 | 95.1 | 492.04 | 23,397 | 22,788 | 23,972 | 1,536 |
| 3 months ago | 2026-06-20 | 96.9 | 492.32 | 23,829 | 23,220 | 23,972 | 1,552 |
| 6 months ago | 2026-03-20 | 95.8 | 492.16 | 23,581 | 22,972 | 23,972 | 1,543 |
| 1 year ago | 2025-09-20 | 96.2 | 492.21 | 23,659 | 23,050 | 23,972 | 1,546 |
*
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 | 2026-09-20 20:30 | 492.37 | 492.80 | -0.43 |
| 1 hour prior | 2026-09-20 19:30 | 492.33 | 492.80 | -0.47 |
| 2 hours prior | 2026-09-20 18:30 | 492.29 | 492.80 | -0.51 |
| 6 hours prior | 2026-09-20 14:30 | 492.07 | 492.80 | -0.73 |
| 12 hours prior | 2026-09-20 08:30 | 492.32 | 492.80 | -0.48 |
| 24 hours prior | 2026-09-19 20:30 | 492.29 | 492.80 | -0.51 |
| 48 hours prior | 2026-09-18 20:30 | 492.26 | 492.80 | -0.54 |
*
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
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| Data Source | LCRA:3999 |
Lake Location
