Lake Austin: 97.8% full as of 2026-09-13
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 | 2026-09-13 | 97.8 | 492.47 | 24,063 | 23,454 | 23,972 | 1,561 |
| Yesterday | 2026-09-12 | 97.3 | 492.39 | 23,938 | 23,329 | 23,972 | 1,556 |
| 2 days ago | 2026-09-11 | 97.0 | 492.34 | 23,860 | 23,251 | 23,972 | 1,553 |
| 1 week ago | 2026-09-06 | 97.8 | 492.46 | 24,047 | 23,438 | 23,972 | 1,560 |
| 1 month ago | 2026-08-13 | 96.3 | 492.24 | 23,705 | 23,096 | 23,972 | 1,547 |
| 3 months ago | 2026-06-13 | 95.6 | 492.13 | 23,535 | 22,926 | 23,972 | 1,541 |
| 6 months ago | 2026-03-13 | 96.3 | 492.24 | 23,705 | 23,096 | 23,972 | 1,547 |
| 1 year ago | 2025-09-13 | 95.6 | 492.12 | 23,520 | 22,911 | 23,972 | 1,541 |
*
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 | 2026-09-13 19:30 | 492.49 | 492.80 | -0.31 |
| 1 hour prior | 2026-09-13 18:30 | 492.45 | 492.80 | -0.35 |
| 2 hours prior | 2026-09-13 17:30 | 492.42 | 492.80 | -0.38 |
| 6 hours prior | 2026-09-13 13:30 | 492.30 | 492.80 | -0.50 |
| 12 hours prior | 2026-09-13 07:30 | 492.50 | 492.80 | -0.30 |
| 24 hours prior | 2026-09-12 19:30 | 492.39 | 492.80 | -0.41 |
| 48 hours prior | 2026-09-11 19:30 | 492.31 | 492.80 | -0.49 |
*
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
