Cracks were discovered in some concrete support girders in July 2015, causing work to be temporarily halted. By July 2016, 30% of the Phase II project had been completed. The contractors reported that significant progress was made with regard to the structure of the line. By March 2017, completion of Phase II construction had reached 56% with work on the rail yard at Dulles Airport reaching 46%, 76% of deck spans being poured, and all aerial guideway girders over the Dulles Access Road near Saarinen Circle being set in place. MWAA reported that crews would soon begin installation of pedestrian bridges at the five stations under construction in the median of the Dulles Access Road and the Dulles Greenway.