Pat Mayse Lake: 98.7% full as of 2026-08-11
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 | 2026-08-11 | 98.7 | 450.73 | 116,325 | 112,165 | 113,683 | 5,609 |
| Yesterday | 2026-08-10 | 98.8 | 450.75 | 116,438 | 112,278 | 113,683 | 5,611 |
| 2 days ago | 2026-08-09 | 99.0 | 450.79 | 116,662 | 112,502 | 113,683 | 5,615 |
| 1 week ago | 2026-08-04 | 99.8 | 450.95 | 117,562 | 113,402 | 113,683 | 5,633 |
| 1 month ago | 2026-07-11 | 100.0 | 452.37 | 125,669 | 113,683 | 113,683 | - n.a. - |
| 3 months ago | 2026-05-11 | 91.0 | 449.15 | 107,617 | 103,457 | 113,683 | 5,355 |
| 6 months ago | 2026-02-11 | 87.3 | 448.36 | 103,430 | 99,270 | 113,683 | 5,250 |
| 1 year ago | 2025-08-11 | 99.3 | 450.85 | 116,999 | 112,839 | 113,683 | 5,622 |
*
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 | 2026-08-11 16:00 | 450.72 | 451.00 | -0.28 |
| 1 hour prior | 2026-08-11 15:00 | 450.73 | 451.00 | -0.27 |
| 2 hours prior | 2026-08-11 14:00 | 450.72 | 451.00 | -0.28 |
| 6 hours prior | 2026-08-11 10:00 | 450.72 | 451.00 | -0.28 |
| 12 hours prior | 2026-08-11 04:00 | 450.73 | 451.00 | -0.27 |
| 24 hours prior | 2026-08-10 16:00 | 450.75 | 451.00 | -0.25 |
| 48 hours prior | 2026-08-09 16:00 | 450.78 | 451.00 | -0.22 |
*
Data is provisional and subject to revision.
Additional Information
| Impoundment date | 1967-01-01 |
| Vertical datum | NGVD29 |
| Dead pool elevation | 415.00 ft above NGVD29 |
| Service spillway crest elevation | 451.00 ft above NGVD29 |
| Emergency spillway crest elevation | 477.00 ft above NGVD29 |
| Flood pool elevation | 460.50 ft above NGVD29 |
| Top of dam elevation | 488.50 ft above NGVD29 |
| Conservation pool elevation | 451.00 ft above NGVD29 |
| Data download (CSV) | period of record, last one year, last 30 days |
| Data Source | USACE:MYST2 |
Lake Location
