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: 24.5% full as of 2018-04-19

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 2018-04-19 24.5 2,630.95 15,103 14,671 59,968 762
1 day prior 2018-04-18 24.5 2,630.97 15,119 14,687 59,968 763
2 days prior 2018-04-17 24.5 2,631.00 15,142 14,710 59,968 764
1 week prior 2018-04-12 24.7 2,631.13 15,243 14,811 59,968 768
1 month prior 2018-03-19 25.0 2,631.34 15,408 14,976 59,968 774
3 months prior 2018-01-19 25.2 2,631.51 15,548 15,116 59,968 779
6 months prior 2017-10-19 26.0 2,632.09 16,012 15,580 59,968 796
1 year prior 2017-04-19 27.8 2,633.41 17,133 16,701 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 2018-04-20 04:30 2,630.94 2,664.0 -33.1 below flood pool
1 hour prior 2018-04-20 03:30 2,630.94 2,664.0 -33.1 below flood pool
2 hours prior 2018-04-20 02:30 2,630.94 2,664.0 -33.1 below flood pool
6 hours prior 2018-04-19 22:30 2,630.94 2,664.0 -33.1 below flood pool
12 hours prior 2018-04-19 16:30 2,630.94 2,664.0 -33.1 below flood pool
24 hours prior 2018-04-19 04:30 2,630.95 2,664.0 -33.1 below flood pool
48 hours prior 2018-04-18 04:30 2,630.98 2,664.0 -33.0 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