MAD RIVER DAM

MAD RIVER - Connecticut River Basin - Winchester, CT

Owned and Maintained by the State of Connecticut, Dept. of Environmental Protection, Water and Related Resources Unit - (860) 566-7244

DRAINAGE AREA= 18.2 sq.mi.

PERMANENT POOL= 10 Acre Conservation Pool
Elevation = 872.0 ft-NGVD (17 ft)

DAM
Type= Rolled earth fill
Length= 940 Feet
Top Elev = 996.0 Ft NGVD (141 Ft)

FLOOD CONTROL STORAGE
Capacity= 9,510 Acre Feet
10.0 Inches of Runoff
Area at Crest= 188.0 Acres

CONTROL WORKS
Type= Circular Concrete Conduit
Size= 3'9" diameter
Length= 923 Feet
Invert Elev = 855.0 Ft NGVD
Capacity at Full Pool= 550 cfs
Gate (Type)= Ungated
Channel Capacity = 600 cfs

SPILLWAY
Type= Chute Spillway/Ogee Weir
Length= 340 Feet
Elev = 983.0 Ft NGVD (128 Ft)

SPILLWAY DESIGN FLOOD

• Original Design Criteria
• Rainfall Excess = 22.8 inches
• Initial Pool Level = Full
• Flood Control Outlet Gates = Negligible
• Peak Inflow = 30,000 cfs
• Peak Outflow = 29,600 cfs
• Max. Pool = 991.0 ft-NGVD
• Freeboard = 5.0 ft

RECREATIONAL FACILITIES= None

TOTAL COST= $5,440,000

PLACED IN OPERATION= June 1963

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