When the New Jersey Department of Transportation wanted to replace the existing timber bridge and overflow spillway in the center of the earthen Lake Narraticon Dam, a temporary, braced, steel sheet pile cofferdam and a permanent, sheet pile cut-off wall were required to excavate to subgrade and to control the water from the adjacent lake. Peirce Engineering designed the 58’W x 115’L cofferdam for the general contractor, temporarily utilizing the permanent cut-off wall as the back side of the cofferdam and eliminating 115 linear feet of sheet pile wall.

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