Lake Austin: 98.2% full as of 2026-09-07
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 | 2026-09-07 | 98.2 | 492.52 | 24,141 | 23,532 | 23,972 | 1,564 |
| Yesterday | 2026-09-06 | 97.8 | 492.46 | 24,047 | 23,438 | 23,972 | 1,560 |
| 2 days ago | 2026-09-05 | 96.9 | 492.33 | 23,845 | 23,236 | 23,972 | 1,553 |
| 1 week ago | 2026-08-31 | 97.4 | 492.40 | 23,953 | 23,344 | 23,972 | 1,557 |
| 1 month ago | 2026-08-07 | 95.5 | 492.11 | 23,504 | 22,895 | 23,972 | 1,540 |
| 3 months ago | 2026-06-07 | 97.0 | 492.34 | 23,860 | 23,251 | 23,972 | 1,553 |
| 6 months ago | 2026-03-07 | 96.0 | 492.18 | 23,612 | 23,003 | 23,972 | 1,544 |
| 1 year ago | 2025-09-07 | 95.3 | 492.08 | 23,458 | 22,849 | 23,972 | 1,539 |
*
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 | 2026-09-07 04:30 | 492.49 | 492.80 | -0.31 |
| 1 hour prior | 2026-09-07 03:30 | 492.51 | 492.80 | -0.29 |
| 2 hours prior | 2026-09-07 02:30 | 492.52 | 492.80 | -0.28 |
| 6 hours prior | 2026-09-06 22:30 | 492.64 | 492.80 | -0.16 |
| 12 hours prior | 2026-09-06 16:30 | 492.42 | 492.80 | -0.38 |
| 24 hours prior | 2026-09-06 04:30 | 492.49 | 492.80 | -0.31 |
| 48 hours prior | 2026-09-05 04:30 | 492.35 | 492.80 | -0.45 |
*
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
