Pond Eddy, NY
This pier repair project for PennDot involved many challenges. The scope of this project was to repair the nose of the center pier of the single-lane Pond Eddy bridge over the Delaware River. The stone masonry pier sustained damage at the nose due to heavy ice flows. A significant portion of the stones were missing and the remaining unsupported stones were threatened. In addition to that there was evidence of heavy localized scouring and undermining of the concrete apron below the waterline. These conditions were repaired by forming and pouring a new concrete nose and by placing grout bags to underpin the apron and provide a scour countermeasure. These repairs were of a critical nature due to the fact that the bridge provides the only vehicular access to the homes on the other side of the river.
There were several challenges that had to be overcome in order to prosecute the work. Gaining access to the river was very limited in the area due to steep banks and rock check dams upstream and downstream. Our solution was to scale down the barges and equipment that would normally be used, thereby eliminating the need to have large costly cranes lift our equipment into the water. Compounding the access difficulties was the fact that the 7 ton weight limit restriction on the bridge only allows small passenger vehicles. Because no large trucks could be on the bridge, the concrete for the nose repair had to be pumped from the shore several hundred feet out across the bridge to the middle of the river. Another challenge faced was the recreational boat traffic navigating the river. The Pond Eddy bridge is located within the Upper Delaware Scenic and Recreational River national park and is a popular location for kayaking, rafting and fishing. In the interest of public safety, we placed high-visibility signs on floating stages warning boaters of the work area ahead. All work was coordinated closely with the park to ensure success. A challenge that is common in marine construction is working in areas that are prone to flooding and are significantly weather-dependent, this project was no different. During the course of this project the river did flood and all equipment had to be removed from the river. Work commenced once the river returned to it’s normal flows.