Pat Mayse Lake: 97.4% full as of 2026-08-17
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 | 2026-08-17 | 97.4 | 450.48 | 114,927 | 110,767 | 113,683 | 5,582 |
| Yesterday | 2026-08-16 | 97.6 | 450.52 | 115,150 | 110,990 | 113,683 | 5,586 |
| 2 days ago | 2026-08-15 | 97.8 | 450.55 | 115,318 | 111,158 | 113,683 | 5,589 |
| 1 week ago | 2026-08-10 | 98.8 | 450.75 | 116,438 | 112,278 | 113,683 | 5,611 |
| 1 month ago | 2026-07-17 | 100.0 | 451.97 | 123,363 | 113,683 | 113,683 | - n.a. - |
| 3 months ago | 2026-05-17 | 91.1 | 449.18 | 107,778 | 103,618 | 113,683 | 5,359 |
| 6 months ago | 2026-02-17 | 89.4 | 448.80 | 105,752 | 101,592 | 113,683 | 5,305 |
| 1 year ago | 2025-08-17 | 99.5 | 450.90 | 117,280 | 113,120 | 113,683 | 5,627 |
*
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 | 2026-08-17 22:00 | 450.46 | 451.00 | -0.54 |
| 1 hour prior | 2026-08-17 21:00 | 450.46 | 451.00 | -0.54 |
| 2 hours prior | 2026-08-17 20:00 | 450.46 | 451.00 | -0.54 |
| 6 hours prior | 2026-08-17 16:00 | 450.46 | 451.00 | -0.54 |
| 12 hours prior | 2026-08-17 10:00 | 450.47 | 451.00 | -0.53 |
| 24 hours prior | 2026-08-16 22:00 | 450.50 | 451.00 | -0.50 |
| 48 hours prior | 2026-08-15 22:00 | 450.54 | 451.00 | -0.46 |
*
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
