UNION VILLAGE DAM

OMPOMPANOOSUC RIVER - Connecticut River Basin - E. Thetford, VT

DRAINAGE AREA: 126 sq.mi.

PERMANENT POOL: Summer - None
Winter - 20 Ft

DAM
Type: Rolled earth
Length: 1,100 Feet
Top Elev=584.0 Ft NGVD (164 Ft)

FLOOD CONTROL STORAGE
Capacity: 38,000 Acre Feet
5.65 Inches of Runoff
Area at Crest: 740 Acres

CONTROL WORKS
Type: Boston Horeshoe Conduit
Size: 13' diameter
Length: 1,236 Feet
Invert Elev = 420.0 Ft NGVD
Capacity (Full Pool): 7,860 cfs
Gates (Type): Broome
Number: 2
Size: 7'-6" X 12'-0"
Channel Capacity = 2400 cfs

SPILLWAY
Type: Chute spillway/Ogee Weir
Length: 388 Feet
Elev = 564.0 Ft NGVD (144 Ft)

SPILLWAY DESIGN FLOOD

• Original Design Criteria:
• Rainfall Excess = 16.1 inches
• Initial Pool Level = Full
• Flood Control Outlet Gates = Inoperable
• Peak Inflow = 87,500 cfs
• Peak Outflow = 84,900 cfs
• Max. Pool = 579.0 ft-NGVD
• Freeboard = 5.0 ft
• Current HMR 51 & 52 Criteria:
• Rainfall Excess = 20.1 inches
• Initial Pool Level = Full
• Flood Control Outlet Gates = Operable
• Peak Inflow = 120,700 cfs
• Peak Outflow = 118,200 cfs
• Max. Pool = 581.1 ft-NGVD
• Freeboard = 2.9 ft

RECREATIONAL FACILITIES: 11 Picnic tables with grills, parking areas, water, bathroom, beach, trails and group picnic shelter.

TOTAL COST: $4,950,000

PLACED IN OPERATION: March 1950