Mackenzie Reservoir: 10.9% full as of 2026-09-21
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 | 2026-09-21 | 10.9 | 3,018.51 | 5,045 | 5,045 | 46,450 | 235 |
| Yesterday | 2026-09-20 | 10.9 | 3,018.53 | 5,048 | 5,048 | 46,450 | 235 |
| 2 days ago | 2026-09-19 | 10.9 | 3,018.54 | 5,049 | 5,049 | 46,450 | 235 |
| 1 week ago | 2026-09-14 | 10.9 | 3,018.68 | 5,070 | 5,070 | 46,450 | 236 |
| 1 month ago | 2026-08-21 | 11.2 | 3,019.20 | 5,196 | 5,196 | 46,450 | 239 |
| 3 months ago | 2026-06-21 | 12.0 | 3,020.77 | 5,555 | 5,555 | 46,450 | 250 |
| 6 months ago | 2026-03-21 | 12.4 | 3,021.56 | 5,739 | 5,739 | 46,450 | 256 |
| 1 year ago | 2025-09-21 | 13.3 | 3,023.34 | 6,166 | 6,166 | 46,450 | 267 |
*
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 | 2026-09-21 03:30 | 3,018.50 | 3,100.00 | -81.50 |
| 1 hour prior | 2026-09-21 02:30 | 3,018.51 | 3,100.00 | -81.49 |
| 2 hours prior | 2026-09-21 01:30 | 3,018.51 | 3,100.00 | -81.49 |
| 6 hours prior | 2026-09-20 21:30 | 3,018.51 | 3,100.00 | -81.49 |
| 12 hours prior | 2026-09-20 15:30 | 3,018.54 | 3,100.00 | -81.46 |
| 24 hours prior | 2026-09-20 03:30 | 3,018.53 | 3,100.00 | -81.47 |
| 48 hours prior | 2026-09-19 03:30 | 3,018.55 | 3,100.00 | -81.45 |
*
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
