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Reservoirs in the Delaware River Basin

Map showing the locations of major reservoirs in the Delaware River Basin.

Reservoirs in the Delaware River Basin are all located on tributaries & play a key role in flow management.

View DRB Water Management schematic (pdf)

Map on left shows locations of major reservoirs in the Delaware River Basin. View as pdf.

♦ Reservoirs in the DRB are used for the following purposes (some are multi-purpose):

--Water Supply

--Hydroelectric Power

--Flood control 

--Recreation

♦ Major DRB Reservoirs include:

New York City Delaware Basin Reservoirs:

Three reservoirs, owned/operated by New York City, are located in the Delaware River Basin's headwaters in New York:

--Cannonsville Reservoir

--Pepacton Reservoir

--Neversink Reservoir

Through the Delaware River Master (a USGS position), releases from these reservoirs are made to meet the Montague, N.J. flow target of 1,750 cfs.

Storage levels in these reservoirs drive the DRBC's basin-wide drought management plan.

DRBC works closely with the River Master and others to monitor storage in these three reservoirs.

DRBC Provides NYC DRB Reservoir Storage Info:

Daily via the Hydrologic Conditions in the DRB Dashboard

Weekly at NYC Delaware River Basin Reservoir Storage Info

U.S. Army Corps of Engineers Reservoirs:

The U.S. Army Corps of Engineers owns several reservoirs in the basin:

--F. E. Walter Reservoir

--Blue Marsh Reservoir

--Beltzville Reservoir

--Prompton Dam

--Jadwin Dam

DRBC owns water supply storage in two of them, Beltzville and Blue Marsh, which are located in the Lehigh and Schuylkill sub-basins respectively; this storage is utilized to meet the Trenton, N.J. flow target of 3,000 cfs. Storage levels in these reservoirs drive the commission's lower basin drought operating plan.  

Other Major DRB Reservoirs:

  • Merrill Creek Reservoir was built by a consortium of power companies in order to provide water releases in times of drought to make up for their consumptive use.

  • Storage in the Marsh Creek Reservoir, located in Chester County, Pa., is used to support in-stream flow management in the Brandywine Creek.

  • In times of drought emergency (view map as pdf), DRBC can call for an additional 69 billion gallons (BG) of water for flow augmentation from several other basin reservoirs:

--Mongaup System (15 BG)

--Lake Wallenpaupack (30 BG)

--F.E. Walter Reservoir (11 BG)

--Nockamixon Reservoir (13 BG)


♦ Reservoir Storage Studies

♦ Related Information:

Hydrologic Reports

Salt Front Location