Lake Austin: 96.7% full as of 2026-09-27
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 | 2026-09-27 | 96.7 | 492.29 | 23,783 | 23,174 | 23,972 | 1,550 |
| Yesterday | 2026-09-26 | 96.2 | 492.21 | 23,659 | 23,050 | 23,972 | 1,546 |
| 2 days ago | 2026-09-25 | 96.0 | 492.19 | 23,628 | 23,019 | 23,972 | 1,545 |
| 1 week ago | 2026-09-20 | 96.9 | 492.32 | 23,829 | 23,220 | 23,972 | 1,552 |
| 1 month ago | 2026-08-27 | 95.8 | 492.16 | 23,581 | 22,972 | 23,972 | 1,543 |
| 3 months ago | 2026-06-27 | 96.2 | 492.22 | 23,674 | 23,065 | 23,972 | 1,546 |
| 6 months ago | 2026-03-27 | 96.7 | 492.29 | 23,783 | 23,174 | 23,972 | 1,550 |
| 1 year ago | 2025-09-27 | 96.2 | 492.22 | 23,674 | 23,065 | 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 | 2026-09-27 17:30 | 492.11 | 492.80 | -0.69 |
| 1 hour prior | 2026-09-27 16:30 | 492.10 | 492.80 | -0.70 |
| 2 hours prior | 2026-09-27 15:30 | 492.00 | 492.80 | -0.80 |
| 6 hours prior | 2026-09-27 11:30 | 492.21 | 492.80 | -0.59 |
| 12 hours prior | 2026-09-27 05:30 | 492.29 | 492.80 | -0.51 |
| 24 hours prior | 2026-09-26 17:30 | 492.09 | 492.80 | -0.71 |
| 48 hours prior | 2026-09-25 17:30 | 492.00 | 492.80 | -0.80 |
*
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
