Specifications include, but are not limited to: This project will include the design of a structure (bridge or box culvert) at Dry Creek. Hydraulic analyses will be performed to determine what type of channel clearance is needed to result in a no-rise condition at the structure assuming that the current backwater condition does not exist due to the constriction point located at a bank of culverts under I-180. Precast girders and/or box culverts should be considered in the design in order to expedite construction. Selection of the structure type should consider project cost and minimization of impacts to the travelling public. Horizontal and vertical roadway realignment on 5th Street should be evaluated to possibly shift the intersection to the north of its existing location. If this option yields a superior design for the intersection and structure, additional right-of-way will need to be acquired.
