<P> Tappan Zee Constructors began construction in 2013 . The north span officially opened to westbound traffic on August 26 , 2017 ; it also opened to eastbound traffic on October 6 , 2017 . Tappan Zee Constructors then began demolishing the old bridge . Eastbound traffic will be switched to the south span upon its completion . Both spans are expected to be operational by June 15 , 2018 . </P>
when is the new tappan zee bridge going to be finished
June 15 , 2018