Greenbelt Lake: 8.5% full as of 2025-10-07

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 2025-10-07 8.5 2,613.98 5,541 5,109 59,968 393
1 day prior 2025-10-06 8.5 2,614.00 5,549 5,117 59,968 393
2 days prior 2025-10-05 8.6 2,614.03 5,561 5,129 59,968 393
1 week prior 2025-09-30 8.6 2,614.17 5,618 5,186 59,968 395
1 month prior 2025-09-07 9.0 2,614.76 5,858 5,426 59,968 405
3 months prior 2025-07-07 10.1 2,616.26 6,463 6,031 59,968 433
6 months prior 2025-04-07 9.0 2,614.66 5,821 5,389 59,968 403
1 year prior 2024-10-07 8.6 2,614.03 5,561 5,129 59,968 393
*

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 2025-10-07 23:30 2,613.97 2,664.00 -50.03
1 hour prior 2025-10-07 22:30 2,613.98 2,664.00 -50.02
2 hours prior 2025-10-07 21:30 2,613.97 2,664.00 -50.03
6 hours prior 2025-10-07 17:30 2,613.97 2,664.00 -50.03
12 hours prior 2025-10-07 11:30 2,613.98 2,664.00 -50.02
24 hours prior 2025-10-06 23:30 2,613.99 2,664.00 -50.01
48 hours prior 2025-10-05 23:30 2,614.01 2,664.00 -49.99
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1968-01-01
Vertical datum NGVD29
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)
Data Source USGS:07299840

Lake Location