Moss Lake: 93.0% full as of 2026-08-23
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 | 2026-08-23 | 93.0 | 713.41 | 22,468 | 22,371 | 24,058 | 1,041 |
| Yesterday | 2026-08-22 | 93.0 | 713.42 | 22,479 | 22,382 | 24,058 | 1,041 |
| 2 days ago | 2026-08-21 | 93.2 | 713.45 | 22,510 | 22,413 | 24,058 | 1,042 |
| 1 week ago | 2026-08-16 | 93.9 | 713.61 | 22,677 | 22,580 | 24,058 | 1,046 |
| 1 month ago | 2026-07-23 | 97.1 | 714.34 | 23,447 | 23,350 | 24,058 | 1,064 |
| 3 months ago | 2026-05-23 | 91.8 | 713.14 | 22,188 | 22,091 | 24,058 | 1,034 |
| 6 months ago | 2026-02-23 | 89.6 | 712.63 | 21,664 | 21,567 | 24,058 | 1,022 |
| 1 year ago | 2025-08-23 | 95.6 | 714.00 | 23,087 | 22,990 | 24,058 | 1,056 |
*
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 | 2026-08-23 17:15 | 713.41 | 715.00 | -1.59 |
| 1 hour prior | 2026-08-23 16:15 | 713.41 | 715.00 | -1.59 |
| 2 hours prior | 2026-08-23 15:15 | 713.41 | 715.00 | -1.59 |
| 6 hours prior | 2026-08-23 11:15 | 713.40 | 715.00 | -1.60 |
| 12 hours prior | 2026-08-23 05:15 | 713.41 | 715.00 | -1.59 |
| 24 hours prior | 2026-08-22 17:15 | 713.42 | 715.00 | -1.58 |
| 48 hours prior | 2026-08-21 17:15 | 713.44 | 715.00 | -1.56 |
*
Data is provisional and subject to revision.
Additional Information
| Impoundment date | 1966-01-01 |
| Vertical datum | NGVD29 |
| Dead pool elevation | 666.00 ft above NGVD29 |
| Service spillway crest elevation | 715.00 ft above NGVD29 |
| Emergency spillway crest elevation | 725.00 ft above NGVD29 |
| Top of dam elevation | 740.00 ft above NGVD29 |
| Conservation pool elevation | 715.00 ft above NGVD29 |
| Data download (CSV) | period of record, last one year, last 30 days |
| Data Source | USGS:07315950 |
| USGS Monitoring Location | USGS:07315950 |
Lake Location
