Lake Bonham: 77.8% full as of 2026-09-27
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 | 2026-09-27 | 77.8 | 562.54 | 8,589 | 8,577 | 11,027 | 938 |
| Yesterday | 2026-09-26 | 77.9 | 562.55 | 8,598 | 8,586 | 11,027 | 938 |
| 2 days ago | 2026-09-25 | 78.1 | 562.58 | 8,627 | 8,615 | 11,027 | 940 |
| 1 week ago | 2026-09-20 | 79.0 | 562.68 | 8,721 | 8,709 | 11,027 | 945 |
| 1 month ago | 2026-08-27 | 85.0 | 563.37 | 9,385 | 9,373 | 11,027 | 978 |
| 3 months ago | 2026-06-27 | 100.0 | 565.12 | 11,167 | 11,027 | 11,027 | 1,076 |
| 6 months ago | 2026-03-27 | 76.1 | 562.34 | 8,403 | 8,391 | 11,027 | 926 |
| 1 year ago | 2025-09-27 | 81.6 | 562.98 | 9,007 | 8,995 | 11,027 | 960 |
*
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 | 2026-09-27 00:00 | 562.54 | 565.00 | -2.46 |
| 1 hour prior | 2026-09-26 23:00 | 562.53 | 565.00 | -2.47 |
| 2 hours prior | 2026-09-26 22:00 | 562.54 | 565.00 | -2.46 |
| 6 hours prior | 2026-09-26 18:00 | 562.55 | 565.00 | -2.45 |
| 12 hours prior | 2026-09-26 12:00 | 562.56 | 565.00 | -2.44 |
| 24 hours prior | 2026-09-26 00:00 | 562.57 | 565.00 | -2.43 |
| 48 hours prior | 2026-09-25 00:00 | 562.60 | 565.00 | -2.40 |
*
Data is provisional and subject to revision.
Additional Information
| Impoundment date | 1969-01-01 |
| Vertical datum | NGVD29 |
| Dead pool elevation | 538.00 ft above NGVD29 |
| Service spillway crest elevation | 565.00 ft above NGVD29 |
| Emergency spillway crest elevation | 571.00 ft above NGVD29 |
| Top of dam elevation | 584.00 ft above NGVD29 |
| Conservation pool elevation | 565.00 ft above NGVD29 |
| Data download (CSV) | period of record, last one year, last 30 days |
| Data Source | USGS:07332610 |
| USGS Monitoring Location | USGS:07332610 |
Lake Location
