I-84 Sandy River and Jordan Rd. Bridges
Start Date: Summer 2010
End Date: November 2014
This project involved the replacement of two structurally deficient bridges on Highway I-84 located over the Sandy River near Troutdale, Oregon. The bridges are located at the gateway to the Columbia River Gorge National Scenic Area. Work began on the project in the early summer of 2010. The new East- and Westbound bridges are 850 ft. steel tub girder structures. Mobility requirements required a temporary detour bridge for the I-84 traffic during construction. Environmental concerns necessitated rigid debris containment structures under the old bridges during demolition, along with access trestles, or work bridges, to keep equipment out of the river. An innovative “Top Down” construction method using a Hamilton-modified gantry crane/beam launching system allowed 165 ft. long steel girders to be “launched” from shore side, thereby avoiding construction of a second work bridge. Other major work activities included a widening of the Eastbound and Westbound Jordan Road bridges, improved bicycle and pedestrian access, and the construction of a temporary detour alignment. The new bridges will be more environmentally friendly, conform to current safety standards and meet aesthetic requirements of national scenic areas.