Lake Austin: 95.7% full as of 2026-08-15
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 | 2026-08-15 | 95.7 | 492.14 | 23,551 | 22,942 | 23,972 | 1,542 |
| Yesterday | 2026-08-14 | 95.8 | 492.16 | 23,581 | 22,972 | 23,972 | 1,543 |
| 2 days ago | 2026-08-13 | 96.3 | 492.24 | 23,705 | 23,096 | 23,972 | 1,547 |
| 1 week ago | 2026-08-08 | 95.8 | 492.15 | 23,566 | 22,957 | 23,972 | 1,542 |
| 1 month ago | 2026-07-15 | 95.3 | 492.08 | 23,458 | 22,849 | 23,972 | 1,539 |
| 3 months ago | 2026-05-15 | 95.5 | 492.11 | 23,504 | 22,895 | 23,972 | 1,540 |
| 6 months ago | 2026-02-15 | 97.5 | 492.42 | 23,985 | 23,376 | 23,972 | 1,558 |
| 1 year ago | 2025-08-15 | 95.7 | 492.14 | 23,551 | 22,942 | 23,972 | 1,542 |
*
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 | 2026-08-15 21:00 | 492.14 | 492.80 | -0.66 |
| 1 hour prior | 2026-08-15 20:00 | 492.09 | 492.80 | -0.71 |
| 2 hours prior | 2026-08-15 19:00 | 492.12 | 492.80 | -0.68 |
| 6 hours prior | 2026-08-15 15:00 | 492.04 | 492.80 | -0.76 |
| 12 hours prior | 2026-08-15 09:00 | 492.12 | 492.80 | -0.68 |
| 24 hours prior | 2026-08-14 21:00 | 492.16 | 492.80 | -0.64 |
| 48 hours prior | 2026-08-13 21:00 | 492.24 | 492.80 | -0.56 |
*
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
