recent changes

2013-02-12: The rating curve for this reservoir has been updated and replaced with data from the Texas Water Development Board's Report 126.

Mackenzie Reservoir is 15.5% full as of 2016-09-28

The elevation-storage rating curve used to produce the storage hydrograph is made of two segments: (1) the segment up to the conservation pool top (below the red line) is based on measured data, while the segment in the flood pool (above the red line) is an extrapolation from the first segment and shouldn't be relied upon for flood storage information.

Date Percent Full Mean Water Level
(ft)
Reservoir Storage
(acre-ft)
Conservation Storage
(acre-ft)
Conservation Capacity
(acre-ft)
Surface Area
(acres)
Most recent 2016-09-28 15.5 3,027.24 7,178 7,178 46,450 294
1 day prior 2016-09-27 15.5 3,027.25 7,181 7,181 46,450 294
2 days prior 2016-09-26 15.5 3,027.27 7,187 7,187 46,450 295
1 week prior 2016-09-21 15.5 3,027.38 7,221 7,221 46,450 295
1 month prior 2016-08-28 15.0 3,026.49 6,975 6,975 46,450 289
3 months prior 2016-06-28 15.5 3,027.33 7,205 7,205 46,450 295
6 months prior 2016-03-28 16.0 3,028.14 7,442 7,442 46,450 300
1 year prior 2015-09-28 16.4 3,028.70 7,597 7,597 46,450 303
*

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 2016-09-29 04:30 3,027.22 3,100.0 -72.8 below flood pool
1 hour prior 2016-09-29 03:30 3,027.21 3,100.0 -72.8 below flood pool
2 hours prior 2016-09-29 02:30 3,027.22 3,100.0 -72.8 below flood pool
6 hours prior 2016-09-28 22:30 3,027.22 3,100.0 -72.8 below flood pool
12 hours prior 2016-09-28 16:30 3,027.25 3,100.0 -72.8 below flood pool
24 hours prior 2016-09-28 04:30 3,027.23 3,100.0 -72.8 below flood pool
48 hours prior 2016-09-27 04:30 3,027.25 3,100.0 -72.8 below flood pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1974-01-01
Vertical datum NGVD29
Gauge USGS:07298100
Service spillway crest elevation 3100 ft above NGVD29
Conservation pool elevation 3100 ft above NGVD29
Emergency spillway crest elevation 3110 ft above NGVD29
Top of dam elevation 3126 ft above NGVD29
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

1974-10-01 (source: twdb)