• Corporate HQ, NY
  • Melville, NY
  • Iselin, NJ
  • Ossining, NY
  • Mount Laurel, NJ

New Croton Aqueduct Rehabilitation


The New Croton Aqueduct, placed into service in 1890, supplies water to portions of Westchester County, the Bronx and Manhattan. The cumulative effects of deterioration in system components reached the point where maintenance and repairs were becoming exceedingly costly.

HAKS, in joint venture, provided construction management/resident engineering inspection services for a $122 million rehabilitation project undertaken by the NYCDEP. Work involved repairing 34 deep shafts and 31 miles of gravity and pressure tunnels as well as the historic gatehouses and pump, motor and piping replacement in shafts serving the villages of Tarrytown and Briarcliff Manor. The project also provided for the connection of the aqueduct to the New Croton Water Treatment Plant at Van Cortland Park.

The project improved structural stability with contact and consolidation grouting along the brick-lined aqueduct, including the 13-foot arched gravity section and 12-foot-diameter pressure section. A major component was the installation of a 60-foot-long concrete plug at Jerome Park Reservoir to divert the raw water carried in the upper part of the aqueduct to the New Croton Water Treatment Plant through the new Raw Water Tunnel. Once treated in the plant, the water will be directed to the aqueduct pressure tunnel through the new Treated Water Tunnel, eliminating the need for chlorination at the reservoir.

The project received the 2012 ACEC New York Diamond Award.