Lake Austin: 95.9% full as of 2026-08-17
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 | 2026-08-17 | 95.9 | 492.17 | 23,597 | 22,988 | 23,972 | 1,544 |
| Yesterday | 2026-08-16 | 95.6 | 492.13 | 23,535 | 22,926 | 23,972 | 1,541 |
| 2 days ago | 2026-08-15 | 95.7 | 492.14 | 23,551 | 22,942 | 23,972 | 1,542 |
| 1 week ago | 2026-08-10 | 96.9 | 492.33 | 23,845 | 23,236 | 23,972 | 1,553 |
| 1 month ago | 2026-07-17 | 95.0 | 492.03 | 23,381 | 22,772 | 23,972 | 1,536 |
| 3 months ago | 2026-05-17 | 96.9 | 492.33 | 23,845 | 23,236 | 23,972 | 1,553 |
| 6 months ago | 2026-02-17 | 97.6 | 492.44 | 24,016 | 23,407 | 23,972 | 1,559 |
| 1 year ago | 2025-08-17 | 97.0 | 492.34 | 23,860 | 23,251 | 23,972 | 1,553 |
*
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 | 2026-08-17 22:30 | 492.19 | 492.80 | -0.61 |
| 1 hour prior | 2026-08-17 21:30 | 492.18 | 492.80 | -0.62 |
| 2 hours prior | 2026-08-17 20:30 | 492.13 | 492.80 | -0.67 |
| 6 hours prior | 2026-08-17 16:30 | 492.05 | 492.80 | -0.75 |
| 12 hours prior | 2026-08-17 10:30 | 492.16 | 492.80 | -0.64 |
| 24 hours prior | 2026-08-16 22:30 | 492.23 | 492.80 | -0.57 |
| 48 hours prior | 2026-08-15 22:30 | 492.18 | 492.80 | -0.62 |
*
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
