recent changes

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

Greenbelt Lake is 25.1% full as of 2016-07-26

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)
Today 2016-07-26 25.1 2,631.46 15,507 15,075 59,968 778
Yesterday 2016-07-25 25.2 2,631.48 15,523 15,091 59,968 778
2 days ago 2016-07-24 25.2 2,631.51 15,548 15,116 59,968 779
1 week ago 2016-07-19 25.4 2,631.68 15,688 15,256 59,968 784
1 month ago 2016-06-26 26.0 2,632.14 16,052 15,620 59,968 797
3 months ago 2016-04-26 24.0 2,630.62 14,845 14,413 59,968 753
6 months ago 2016-01-26 23.6 2,630.25 14,570 14,138 59,968 744
1 year ago 2015-07-26 22.6 2,629.45 14,009 13,577 59,968 722
*

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 2016-07-26 15:30 2,631.45 2,664.0 -32.6 below flood pool
1 hour prior 2016-07-26 14:30 2,631.46 2,664.0 -32.5 below flood pool
2 hours prior 2016-07-26 13:30 2,631.46 2,664.0 -32.5 below flood pool
6 hours prior 2016-07-26 09:30 2,631.46 2,664.0 -32.5 below flood pool
12 hours prior 2016-07-26 03:30 2,631.47 2,664.0 -32.5 below flood pool
24 hours prior 2016-07-25 15:30 2,631.47 2,664.0 -32.5 below flood pool
48 hours prior 2016-07-24 15:30 2,631.51 2,664.0 -32.5 below flood pool
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1968-01-01
Vertical datum NGVD29
Gauge USGS:07299840
Dead pool elevation 2590.0 ft above NGVD29
Service spillway crest elevation 2664 ft above NGVD29
Conservation pool elevation 2664.0 ft above NGVD29
Emergency spillway crest elevation 2674 ft above NGVD29
Top of dam elevation 2686 ft above NGVD29
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

1974-10-01 (source: twdb)