Movable Dam 7 at Lock E-11

Movable Dam 7 at Lock E-11

United States
Dam 7 Lock E-11

TYLin developed plans and contract documents for the rehabilitation of Movable Dam 7 at Lock E-11 in Randall, New York.

Dam 7 consists of three spans. The outside spans are 186.5-foot-long steel trusses, and the center span is 216.5 feet long. The steel trusses support 19 vertical lift gates. TYLin guided the New York State Thruway Authority Canal Corp in rehabilitating the structure.

Constructed in 1914 with modifications added in 1924, the dam required remediation of the structural steel superstructure and gates, as well as the substructure units and concrete aprons due to deterioration. 

The detailed inspection comprised ultrasonic thickness measurements to determine the extent of steel deterioration and concrete coring to establish the depth of concrete deterioration. After the inspection, structural analysis was performed to determine which elements of the dam would require replacement or remediation. 

The project also involved the preparation of a detailed Cofferdam Impact Analysis to determine the flooding impacts to the adjacent communities. A detailed Hydrologic Engineering Center's (CEIWR-HEC) River Analysis System (HEC-RAS) model was also developed of the area.  

Project Highlights: 

  • A Dam Safety Report was developed for the project per the requirements of the New York State Department of Environmental Conservation. 
  • The project included the investigation of hazardous waste and contaminated materials (HWCM), asbestos, lead, and the impacts to threatened and endangered wildlife species. 
  • Barge-mounted drilling rigs were used to perform geotechnical investigations.