Mackenzie Reservoir: 11.0% full as of 2026-09-05
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 | 2026-09-05 | 11.0 | 3,018.88 | 5,110 | 5,110 | 46,450 | 238 |
| 1 day prior | 2026-09-04 | 11.0 | 3,018.91 | 5,118 | 5,118 | 46,450 | 238 |
| 2 days prior | 2026-09-03 | 11.0 | 3,018.90 | 5,115 | 5,115 | 46,450 | 238 |
| 1 week prior | 2026-08-29 | 11.1 | 3,019.01 | 5,144 | 5,144 | 46,450 | 238 |
| 1 month prior | 2026-08-05 | 11.5 | 3,019.68 | 5,325 | 5,325 | 46,450 | 243 |
| 3 months prior | 2026-06-05 | 12.1 | 3,021.01 | 5,606 | 5,606 | 46,450 | 251 |
| 6 months prior | 2026-03-05 | 12.5 | 3,021.77 | 5,794 | 5,794 | 46,450 | 257 |
| 1 year prior | 2025-09-05 | 13.4 | 3,023.52 | 6,212 | 6,212 | 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 | 2026-09-05 23:30 | 3,018.86 | 3,100.00 | -81.14 |
| 1 hour prior | 2026-09-05 22:30 | 3,018.86 | 3,100.00 | -81.14 |
| 2 hours prior | 2026-09-05 21:30 | 3,018.88 | 3,100.00 | -81.12 |
| 6 hours prior | 2026-09-05 17:30 | 3,018.89 | 3,100.00 | -81.11 |
| 12 hours prior | 2026-09-05 11:30 | 3,018.88 | 3,100.00 | -81.12 |
| 24 hours prior | 2026-09-04 23:30 | 3,018.89 | 3,100.00 | -81.11 |
| 48 hours prior | 2026-09-03 23:30 | 3,018.91 | 3,100.00 | -81.09 |
*
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)
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|
| Data Source | USGS:07298100 |
| USGS Monitoring Location | USGS:07298100 |
Lake Location
