Lake L. B. Johnson: 97.5% full as of 2026-07-30
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 | 2026-07-30 | 97.5 | 824.56 | 128,797 | 109,957 | 112,778 | 6,391 |
| Yesterday | 2026-07-29 | 97.8 | 824.61 | 129,117 | 110,277 | 112,778 | 6,395 |
| 2 days ago | 2026-07-28 | 97.9 | 824.63 | 129,244 | 110,404 | 112,778 | 6,397 |
| 1 week ago | 2026-07-23 | 98.2 | 824.69 | 129,628 | 110,788 | 112,778 | 6,403 |
| 1 month ago | 2026-06-30 | 98.4 | 824.72 | 129,821 | 110,981 | 112,778 | 6,406 |
| 3 months ago | 2026-04-30 | 97.2 | 824.50 | 128,414 | 109,574 | 112,778 | 6,385 |
| 6 months ago | 2026-01-30 | 97.8 | 824.61 | 129,117 | 110,277 | 112,778 | 6,395 |
| 1 year ago | 2025-07-30 | 98.0 | 824.65 | 129,372 | 110,532 | 112,778 | 6,399 |
*
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 | 2026-07-30 16:00 | 824.63 | 825.00 | -0.37 |
| 1 hour prior | 2026-07-30 15:00 | 824.63 | 825.00 | -0.37 |
| 2 hours prior | 2026-07-30 14:00 | 824.62 | 825.00 | -0.38 |
| 6 hours prior | 2026-07-30 10:00 | 824.59 | 825.00 | -0.41 |
| 12 hours prior | 2026-07-30 04:00 | 824.55 | 825.00 | -0.45 |
| 24 hours prior | 2026-07-29 16:00 | 824.67 | 825.00 | -0.33 |
| 48 hours prior | 2026-07-28 16:00 | 824.71 | 825.00 | -0.29 |
*
Data is provisional and subject to revision.
Additional Information
| Impoundment date | 1951-01-01 |
| Vertical datum | NAVD88 +0.68 |
| Dead pool elevation | 793.40 ft above NAVD88 +0.68 |
| Service spillway crest elevation | 795.00 ft above NAVD88 +0.68 |
| Emergency spillway crest elevation | 835.50 ft above NAVD88 +0.68 |
| Top of dam elevation | 838.50 ft above NAVD88 +0.68 |
| Conservation pool elevation | 825.00 ft above NAVD88 +0.68 |
| Data download (CSV) | period of record, last one year, last 30 days |
Elevation-Area-Capacity Curves
2007-05-01 (source: TWDB)
: GIS Data
2020-06-01 (source: TWDB)
: GIS Data
|
|
| Data Source | LCRA:2958 |
Lake Location
