Mackenzie Reservoir: 11.5% full as of 2026-08-06
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 | 2026-08-06 | 11.5 | 3,019.66 | 5,320 | 5,320 | 46,450 | 243 |
| 1 day prior | 2026-08-05 | 11.5 | 3,019.68 | 5,325 | 5,325 | 46,450 | 243 |
| 2 days prior | 2026-08-04 | 11.5 | 3,019.71 | 5,332 | 5,332 | 46,450 | 243 |
| 1 week prior | 2026-07-30 | 11.6 | 3,019.87 | 5,368 | 5,368 | 46,450 | 244 |
| 1 month prior | 2026-07-06 | 11.8 | 3,020.49 | 5,496 | 5,496 | 46,450 | 248 |
| 3 months prior | 2026-05-06 | 11.9 | 3,020.72 | 5,544 | 5,544 | 46,450 | 250 |
| 6 months prior | 2026-02-06 | 12.6 | 3,021.92 | 5,832 | 5,832 | 46,450 | 258 |
| 1 year prior | 2025-08-06 | 13.6 | 3,023.99 | 6,332 | 6,332 | 46,450 | 272 |
*
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 | 2026-08-06 23:30 | 3,019.64 | 3,100.00 | -80.36 |
| 1 hour prior | 2026-08-06 22:30 | 3,019.64 | 3,100.00 | -80.36 |
| 2 hours prior | 2026-08-06 21:30 | 3,019.64 | 3,100.00 | -80.36 |
| 6 hours prior | 2026-08-06 17:30 | 3,019.65 | 3,100.00 | -80.35 |
| 12 hours prior | 2026-08-06 11:30 | 3,019.67 | 3,100.00 | -80.33 |
| 24 hours prior | 2026-08-05 23:30 | 3,019.66 | 3,100.00 | -80.34 |
| 48 hours prior | 2026-08-04 23:30 | 3,019.68 | 3,100.00 | -80.32 |
*
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
