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: 18.1% full as of 2021-06-24

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 2021-06-24 18.1 2,625.47 11,290 10,858 59,968 619
1 day prior 2021-06-23 18.0 2,625.36 11,217 10,785 59,968 616
2 days prior 2021-06-22 18.0 2,625.38 11,230 10,798 59,968 617
1 week prior 2021-06-17 18.2 2,625.55 11,345 10,913 59,968 621
1 month prior 2021-05-24 16.9 2,624.30 10,575 10,143 59,968 593
3 months prior 2021-03-24 17.3 2,624.68 10,814 10,382 59,968 601
6 months prior 2020-12-24 16.5 2,623.90 10,305 9,873 59,968 585
1 year prior 2020-06-24 20.0 2,627.13 12,403 11,971 59,968 660
*

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 2021-06-25 00:30 2,625.49 2,664.00 -38.51 below flood pool
1 hour prior 2021-06-24 23:30 2,625.49 2,664.00 -38.51 below flood pool
2 hours prior 2021-06-24 22:30 2,625.45 2,664.00 -38.55 below flood pool
6 hours prior 2021-06-24 18:30 2,625.47 2,664.00 -38.53 below flood pool
12 hours prior 2021-06-24 12:30 2,625.50 2,664.00 -38.50 below flood pool
24 hours prior 2021-06-24 00:30 2,625.36 2,664.00 -38.64 below flood pool
48 hours prior 2021-06-23 00:30 2,625.36 2,664.00 -38.64 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 2,590.00 ft above NGVD29
Service spillway crest elevation 2,664.00 ft above NGVD29
Emergency spillway crest elevation 2,674.00 ft above NGVD29
Top of dam elevation 2,686.00 ft above NGVD29
Conservation pool elevation 2,664.00 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