Reservoir Volumes and Storage for Drought Monitoring as of September 2015

Storage in selected Maryland reservoirs for the end of September, 2015

Water System Reservoir Percent Full* Days of Storage**

City of Frostburg

Piney 99% 595
City of Cumberland Lake Gordon 100% 361
Lake Koon 81%

City of Baltimore

Liberty 99% 364
Loch Raven 100%
Prettyboy 100%
Total 99%


Triadelphia Reservoir 65% 129
Rocky Gorge/Duckett
Seneca Creek Reserve 96% NA
All Potomac River Plants Jennings-Randolph Reserve*** 100% NA

* Percent Full is the ratio of current volume to the maximum usable volume in each reservoir at the end of the month.

** Days of Storage is the amount of days it would take to use current volume of reservoir (w/o recharge) based on average raw water withdrawals from similar time frame from previous two years.

*** Percent full for Jennings-Randolph Reservoir is based on alloted amount of water in reservoir used to supplement Potomac River flow for drinking water purposes.

Related Topics

For More Information

Please contact the Water Supply Program at or 410-537-3702