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