Lake Austin: 96.7% full as of 2026-10-18
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 | 2026-10-18 | 96.7 | 492.29 | 23,783 | 23,174 | 23,972 | 1,550 |
| Yesterday | 2026-10-17 | 96.7 | 492.30 | 23,798 | 23,189 | 23,972 | 1,551 |
| 2 days ago | 2026-10-16 | 96.7 | 492.29 | 23,783 | 23,174 | 23,972 | 1,550 |
| 1 week ago | 2026-10-11 | 96.0 | 492.19 | 23,628 | 23,019 | 23,972 | 1,545 |
| 1 month ago | 2026-09-18 | 96.6 | 492.28 | 23,767 | 23,158 | 23,972 | 1,550 |
| 3 months ago | 2026-07-18 | 96.0 | 492.19 | 23,628 | 23,019 | 23,972 | 1,545 |
| 6 months ago | 2026-04-18 | 97.1 | 492.35 | 23,876 | 23,267 | 23,972 | 1,554 |
| 1 year ago | 2025-10-18 | 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 | 2026-10-18 17:30 | 492.12 | 492.80 | -0.68 |
| 1 hour prior | 2026-10-18 16:30 | 492.13 | 492.80 | -0.67 |
| 2 hours prior | 2026-10-18 15:30 | 492.14 | 492.80 | -0.66 |
| 6 hours prior | 2026-10-18 11:30 | 492.21 | 492.80 | -0.59 |
| 12 hours prior | 2026-10-18 05:30 | 492.29 | 492.80 | -0.51 |
| 24 hours prior | 2026-10-17 17:30 | 492.21 | 492.80 | -0.59 |
| 48 hours prior | 2026-10-16 17:30 | 492.21 | 492.80 | -0.59 |
*
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
