Of the several tasks that have been assigned to Siefert Associates from the 3rd Track Constructors JV, many are in full production mode....

In April 2019, Tappan Zee Constructors’ crews successfully installed the 200-foot super gantry at the Mario M. Cuomo Bridge over NY’s...

Erection of the main terminal structural steel has begun at Newark Liberty International Airport in Newark, NJ. Stonebridge Steel...

Siefert Associates provided engineering services for removal and replacement of 102-year-old station Astoria Boulevard in support of ADA...

The Manitowoc 16000 is on site and erecting steel in the main terminal in support of the Newark Liberty International Airport, Terminal A...