BLACK ROCK DAM

BRANCH BROOK - Naugatuck River Watershed - Thomaston, CT

DRAINAGE AREA: 20.4 sq.mi.

PERMANENT POOL: 21 Acre Recreation Pool
Stage: 27 ft (437.0 ft NGVD)

DAM
Type: Rolled earth fill
Length: 933 Feet
Top Elev: 540.0 ft NGVD (130 ft)

FLOOD CONTROL STORAGE
Capacity: 8,450 Acre Feet
7.75 Inches of Runoff
Area at Crest: 190 Acres

CONTROL WORKS
Type: Rectangular Concrete Conduit
Size: 4'W x 5'H
Length: 704 Feet
Invert Elev: 410.0 ft NGVD
Weir Elevation (top of logs): 437 ft NGVD (27 ft)
Capacity (Full Pool): 900 cfs
Gate (Type): Hydraulic Sluice
Number: 2
Size: 3'W x 4'H
Channel Capacity: 800 cfs

SPILLWAY
Type: Chute Spillway/Ogee Weir
Length: 140 Feet
Elev: 520.0 ft NGVD (110 ft)

RECREATIONAL FACILITIES: Overlook area, fishing and hunting.

TOTAL COST: $8,245,000

PLACED IN OPERATION: June 1970