Pat Mayse Lake: 91.0% 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 | 91.0 | 449.14 | 107,564 | 103,404 | 113,683 | 5,353 |
| Yesterday | 2026-09-26 | 91.1 | 449.16 | 107,671 | 103,511 | 113,683 | 5,356 |
| 2 days ago | 2026-09-25 | 91.2 | 449.20 | 107,885 | 103,725 | 113,683 | 5,362 |
| 1 week ago | 2026-09-20 | 92.1 | 449.38 | 108,853 | 104,693 | 113,683 | 5,394 |
| 1 month ago | 2026-08-27 | 96.0 | 450.18 | 113,257 | 109,097 | 113,683 | 5,550 |
| 3 months ago | 2026-06-27 | 100.0 | 454.78 | 139,927 | 113,683 | 113,683 | - n.a. - |
| 6 months ago | 2026-03-27 | 88.5 | 448.62 | 104,799 | 100,639 | 113,683 | 5,282 |
| 1 year ago | 2025-09-27 | 95.7 | 450.13 | 112,980 | 108,820 | 113,683 | 5,544 |
*
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 17:00 | 449.13 | 451.00 | -1.87 |
| 1 hour prior | 2026-09-27 16:00 | 449.13 | 451.00 | -1.87 |
| 2 hours prior | 2026-09-27 15:00 | 449.12 | 451.00 | -1.88 |
| 6 hours prior | 2026-09-27 11:00 | 449.13 | 451.00 | -1.87 |
| 12 hours prior | 2026-09-27 05:00 | 449.15 | 451.00 | -1.85 |
| 24 hours prior | 2026-09-26 17:00 | 449.16 | 451.00 | -1.84 |
| 48 hours prior | 2026-09-25 17:00 | 449.20 | 451.00 | -1.80 |
*
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
