Triborough Bridge

Location: Ward's and Randall's Island, NY
Contractor: Koch Skanska
Status: Under Construction
Demolition of existing ramps and widening of roadway.
Siefert Associates responsible for: Demolition and erection plans, jacking, post tensioning, and steel retrofit operations.

Roslyn Viaduct

Location: Roslyn, NY
Status: Under Construction
Demolition of existing Rte. 25A viaduct over the Hempstead Harbor and
erection of a new pre-cast concrete segmental bridge structure.
Siefert Associates responsible for: Demolition Plan, Temporary Support Systems, Structure Lifting Operations

 

Alexander Hamilton Bridge Rehab

Location:  Cross Bronx Expressway, I95, New York City
Contractor: CCA Civil Inc. /Halmar International LLC Joint Venture
Status: Under Construction
Construction service for the Alexander Hamilton Bridge and Highbridge interchange ramps,
rehabilitation of I-95 corridor  
between Amsterdam Avenue and Undercliff Avenue in the Bronx and New York counties. 
Siefert Associates responsible for: Design of existing new ramps 6A and 7A. 

Site of Former World Trade Center Towers

Location:  Lower Manhattan, New York City
Contractor: Skanska Mechanical & Structural
Status: Under Construction
Construction service for the development of Construction Plans in Lower Manhattan.
Siefert Associates responsible for: Design & Engineering Management

 

Other Projects:

Check back for further updates and details . . .