Reservoir Volumes and Storage for Drought Monitoring as of July 31, 2019

​​Storage in selected Maryland reservoirs for the end of July, 2019

Water System Reservoir Percent Full* Days of Storage**
City of Frostburg
Piney 99% 598
City of Cumberland Lake Gordon 98% 413
Lake Koon 100%
City of Baltimore
Liberty 100% 343
Loch Raven 100%
Prettyboy 98%
Total 100%
Triadelphia Reservoir***** 55% 105
Rocky Gorge/Duckett
Seneca Creek Reserve 99% 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 number of days available to meet the system's demand.

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


*****Triadelphia has been drawn down for a project to rehabilitate Brighton Dam.


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For More Information
Please contact the Water Supply Program at​ or 410-537-3702