Mackenzie Reservoir: 11.1% full as of 2026-08-25
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 | 2026-08-25 | 11.1 | 3,019.10 | 5,169 | 5,169 | 46,450 | 239 |
| 1 day prior | 2026-08-24 | 11.1 | 3,019.12 | 5,174 | 5,174 | 46,450 | 239 |
| 2 days prior | 2026-08-23 | 11.2 | 3,019.15 | 5,183 | 5,183 | 46,450 | 239 |
| 1 week prior | 2026-08-18 | 11.2 | 3,019.30 | 5,223 | 5,223 | 46,450 | 240 |
| 1 month prior | 2026-07-25 | 11.6 | 3,020.04 | 5,402 | 5,402 | 46,450 | 245 |
| 3 months prior | 2026-05-25 | 12.0 | 3,020.76 | 5,553 | 5,553 | 46,450 | 250 |
| 6 months prior | 2026-02-25 | 12.5 | 3,021.81 | 5,804 | 5,804 | 46,450 | 257 |
| 1 year prior | 2025-08-25 | 13.5 | 3,023.72 | 6,263 | 6,263 | 46,450 | 270 |
*
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 | 2026-08-25 23:30 | 3,019.08 | 3,100.00 | -80.92 |
| 1 hour prior | 2026-08-25 22:30 | 3,019.13 | 3,100.00 | -80.87 |
| 2 hours prior | 2026-08-25 21:30 | 3,019.12 | 3,100.00 | -80.88 |
| 6 hours prior | 2026-08-25 17:30 | 3,019.12 | 3,100.00 | -80.88 |
| 12 hours prior | 2026-08-25 11:30 | 3,019.10 | 3,100.00 | -80.90 |
| 24 hours prior | 2026-08-24 23:30 | 3,019.11 | 3,100.00 | -80.89 |
| 48 hours prior | 2026-08-23 23:30 | 3,019.14 | 3,100.00 | -80.86 |
*
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
