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: 25.5% full as of 2017-09-20

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 2017-09-20 25.5 2,631.75 15,744 15,312 59,968 786
1 day prior 2017-09-19 25.6 2,631.78 15,768 15,336 59,968 787
2 days prior 2017-09-18 25.6 2,631.80 15,784 15,352 59,968 788
1 week prior 2017-09-13 25.7 2,631.88 15,847 15,415 59,968 790
1 month prior 2017-08-20 26.3 2,632.30 16,180 15,748 59,968 802
3 months prior 2017-06-20 27.3 2,632.99 16,780 16,348 59,968 822
6 months prior 2017-03-20 27.4 2,633.08 16,857 16,425 59,968 824
1 year prior 2016-09-20 27.8 2,633.40 17,124 16,692 59,968 834
*

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 2017-09-21 04:30 2,631.74 2,664.0 -32.3 below flood pool
1 hour prior 2017-09-21 03:30 2,631.74 2,664.0 -32.3 below flood pool
2 hours prior 2017-09-21 02:30 2,631.74 2,664.0 -32.3 below flood pool
6 hours prior 2017-09-20 22:30 2,631.74 2,664.0 -32.3 below flood pool
12 hours prior 2017-09-20 16:30 2,631.75 2,664.0 -32.2 below flood pool
24 hours prior 2017-09-20 04:30 2,631.76 2,664.0 -32.2 below flood pool
48 hours prior 2017-09-19 04:30 2,631.79 2,664.0 -32.2 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 2,590.0 ft above NGVD29
Service spillway crest elevation 2,664.0 ft above NGVD29
Emergency spillway crest elevation 2,674.0 ft above NGVD29
Top of dam elevation 2,686.0 ft above NGVD29
Conservation pool elevation 2,664.0 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