Lake L. B. Johnson: 97.8% full as of 2026-07-28
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 | 2026-07-28 | 97.8 | 824.61 | 129,117 | 110,277 | 112,778 | 6,395 |
| Yesterday | 2026-07-27 | 98.0 | 824.64 | 129,308 | 110,468 | 112,778 | 6,398 |
| 2 days ago | 2026-07-26 | 97.8 | 824.62 | 129,181 | 110,341 | 112,778 | 6,396 |
| 1 week ago | 2026-07-21 | 97.8 | 824.62 | 129,181 | 110,341 | 112,778 | 6,396 |
| 1 month ago | 2026-06-28 | 98.4 | 824.72 | 129,821 | 110,981 | 112,778 | 6,406 |
| 3 months ago | 2026-04-28 | 98.6 | 824.75 | 130,013 | 111,173 | 112,778 | 6,408 |
| 6 months ago | 2026-01-28 | 97.3 | 824.53 | 128,605 | 109,765 | 112,778 | 6,388 |
| 1 year ago | 2025-07-28 | 98.9 | 824.80 | 130,333 | 111,493 | 112,778 | 6,413 |
*
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 | 2026-07-28 16:00 | 824.71 | 825.00 | -0.29 |
| 1 hour prior | 2026-07-28 15:00 | 824.69 | 825.00 | -0.31 |
| 2 hours prior | 2026-07-28 14:00 | 824.68 | 825.00 | -0.32 |
| 6 hours prior | 2026-07-28 10:00 | 824.66 | 825.00 | -0.34 |
| 12 hours prior | 2026-07-28 04:00 | 824.60 | 825.00 | -0.40 |
| 24 hours prior | 2026-07-27 16:00 | 824.72 | 825.00 | -0.28 |
| 48 hours prior | 2026-07-26 16:00 | 824.70 | 825.00 | -0.30 |
*
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
