Grassy Point Road Bridge Rehabilitation
When Rockland County Highway Department’s Grassy Point Road Bridge, originally built in 1928 over Minisceongo Creek in Haverstraw NY, began to show signs of deterioration, our bridge engineers performed condition assessment inspections that ultimately marked the structure with a reduced weight limit. As a result, it was determined a complete bridge replacement was necessary to mitigate safety concerns for motorists and pedestrians.
Working with HVEA Engineers and HVB Construction Inc., the team developed a 70-foot span steel multi-girder replacement bridge designed to carry two 11-foot-wide vehicle lanes with 4-foot-wide shoulders. The single span modern structure is designed to rest on abutments supported by micropiles. Our design scope also included roughly 500 feet of approach roadway reconstruction on both sides of the bridge.
One of the central challenges revolved around the intricate task of seamlessly integrating the new bridge within the existing underground utility infrastructure. To solve for this, McLaren's innovative design enabled the bridge abutments to extend over a 42-inch sewer line that traverses the Minisceongo Creek and closely mirrors the alignment of the bridge itself.
Since the new bridge was built adjacent to the existing bridge, the original concrete abutments were kept in place, as they did not interfere with the new design, to save the client time and money. Also, the parallel bridge construction enabled the continued use of the original structure to maintain traffic flow during construction with little disruption to the surrounding community.
Photo courtesy of HVEA Engineers
Upon completion of the new bridge, the approaches were realigned, and the existing bridge superstructure will be removed.
