NORTH SPRINGFIELD DAM

BLACK RIVER - Connecticut River Basin - North Springfield, VT

DRAINAGE AREA: 158 sq.mi.

PERMANENT POOL: 100 Acre Recreation Pool
Stage: 15 ft (467.0 ft NGVD)

DAM
Type: Rolled earth
Length: 2,940 ft
Top Elev: 570.0 ft NGVD (118 ft)

FLOOD CONTROL STORAGE Capacity: 50,200 Acre Feet
5.96 Inches of Runoff
Area at Crest: 1,200 Acres

CONTROL WORKS
Type: Boston Horseshoe Conduit
Size: 12'-9" diameter
Length: 659 Feet
Invert Elev: 452.0 ft NGVD
Weir Elevation (top of logs): 467 ft NGVD (15 ft)
Capacity (Full Pool): 11,900 cfs
Gates (Type): Slide with Hydraulic hoist
Number: 3
Size: 5' X 12'
Channel Capacity: 4000 cfs

SPILLWAY Type: Side-Channel Spillway
Length: 384 Feet
Elev: 545.5 ft NGVD (93.5 ft)

SPILLWAY DESIGN FLOOD

Original Design Criteria:
- Rainfall Excess: 18.2 inches
- Initial Pool Level: Full
- Flood Control Outlet Gates: Operable
- Peak Inflow: 157,000 cfs
- Peak Outflow: 125,500 cfs
- Max. Pool: 564.8 ft-NGVD
- Freeboard: 5.2 ft
Current HMR 51 & 52 Criteria:
- Rainfall Excess: 19.97 inches
- Initial Pool Level: Full
- Flood Control Outlet Gates: Operable
- Peak Inflow: 159,200 cfs
- Peak Outflow: 125,000 cfs
- Max. Pool: 564.7 ft-NGVD
- Freeboard: 5.3 ft

RECREATIONAL FACILITIES: 29 Picnic tables with grills, bathroom, parking areas, beach, change house, 2 boat ramps and group picnic shelter.

TOTAL COST: $6,654,000

PLACED IN OPERATION: September 1960