Mackenzie Reservoir: 10.9% full as of 2026-09-14
Historical Data
| Date | Percent Full |
Mean Water Level (ft) |
Reservoir Storage (acre-ft) |
Conservation Storage (acre-ft) |
Conservation Capacity (acre-ft) |
Surface Area (acres) |
|
|---|---|---|---|---|---|---|---|
| Most recent | 2026-09-14 | 10.9 | 3,018.68 | 5,070 | 5,070 | 46,450 | 236 |
| 1 day prior | 2026-09-13 | 10.9 | 3,018.71 | 5,075 | 5,075 | 46,450 | 236 |
| 2 days prior | 2026-09-12 | 10.9 | 3,018.73 | 5,079 | 5,079 | 46,450 | 236 |
| 1 week prior | 2026-09-07 | 11.0 | 3,018.84 | 5,101 | 5,101 | 46,450 | 237 |
| 1 month prior | 2026-08-14 | 11.3 | 3,019.41 | 5,253 | 5,253 | 46,450 | 241 |
| 3 months prior | 2026-06-14 | 12.0 | 3,020.87 | 5,576 | 5,576 | 46,450 | 251 |
| 6 months prior | 2026-03-14 | 12.4 | 3,021.64 | 5,760 | 5,760 | 46,450 | 256 |
| 1 year prior | 2025-09-14 | 13.3 | 3,023.46 | 6,197 | 6,197 | 46,450 | 268 |
*
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 | 2026-09-15 03:30 | 3,018.66 | 3,100.00 | -81.34 |
| 1 hour prior | 2026-09-15 02:30 | 3,018.65 | 3,100.00 | -81.35 |
| 2 hours prior | 2026-09-15 01:30 | 3,018.66 | 3,100.00 | -81.34 |
| 6 hours prior | 2026-09-14 21:30 | 3,018.67 | 3,100.00 | -81.33 |
| 12 hours prior | 2026-09-14 15:30 | 3,018.69 | 3,100.00 | -81.31 |
| 24 hours prior | 2026-09-14 03:30 | 3,018.68 | 3,100.00 | -81.32 |
| 48 hours prior | 2026-09-13 03:30 | 3,018.72 | 3,100.00 | -81.28 |
*
Data is provisional and subject to revision.
Additional Information
| Impoundment date | 1974-01-01 |
| Vertical datum | NGVD29 |
| Service spillway crest elevation | 3,100.00 ft above NGVD29 |
| Emergency spillway crest elevation | 3,110.00 ft above NGVD29 |
| Top of dam elevation | 3,126.00 ft above NGVD29 |
| Conservation pool elevation | 3,100.00 ft above NGVD29 |
| Data download (CSV) | period of record, last one year, last 30 days |
Elevation-Area-Capacity Curves
1974-10-01 (source: TWDB)
|
|
| Data Source | USGS:07298100 |
| USGS Monitoring Location | USGS:07298100 |
Lake Location
