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: 8.4% full as of 2021-06-23

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, and (2) 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.

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 2021-06-23 8.4 3,012.51 3,885 3,885 46,450 197
1 day prior 2021-06-22 8.4 3,012.54 3,890 3,890 46,450 197
2 days prior 2021-06-21 8.4 3,012.58 3,897 3,897 46,450 197
1 week prior 2021-06-16 8.5 3,012.75 3,926 3,926 46,450 198
1 month prior 2021-05-23 8.5 3,012.87 3,946 3,946 46,450 199
3 months prior 2021-03-23 8.8 3,013.70 4,082 4,082 46,450 204
6 months prior 2020-12-23 9.0 3,014.22 4,189 4,189 46,450 207
1 year prior 2020-06-23 10.6 3,017.78 4,910 4,910 46,450 230
*

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 2021-06-24 00:30 3,012.47 3,100.00 -87.53 below flood pool
1 hour prior 2021-06-23 23:30 3,012.47 3,100.00 -87.53 below flood pool
2 hours prior 2021-06-23 22:30 3,012.48 3,100.00 -87.52 below flood pool
6 hours prior 2021-06-23 18:30 3,012.47 3,100.00 -87.53 below flood pool
12 hours prior 2021-06-23 12:30 3,012.50 3,100.00 -87.50 below flood pool
24 hours prior 2021-06-23 00:30 3,012.52 3,100.00 -87.48 below flood pool
48 hours prior 2021-06-22 00:30 3,012.56 3,100.00 -87.44 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 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)

Lake Location