Redmill Pedestrian Bridge
This project involved the design and construction management of a 120′-0″ clear span thru-truss structure with a non-composite, glued-laminated deck over the North Branch of Blacklick Creek in Blacklick Township, Cambria County. The bridge connects two separate portions of Rails to Trails enhancement projects, all funded under Section 130 of the 1991 Intermodal Surface Transportation Efficiency Act (ISTEA). Due to its rural location, and the desire to minimize damage to the existing trail, constructability was a primary factor in the design. The thru-truss had strategically placed field splices designed to ensure that the girders could be delivered over the winding roads and trails leading to the site. Another major concern was flooding and scour. The pre-existing bridge superstructure was washed-out in the flood of 1972, and the northern abutment stood five feet in the channel at the time of inspection in 1996, with much of the abutment missing. Due to the severe scour evident, the northern abutment was moved 20 feet further north, and the bearing elevation of the footing placed on sound rock over 30 feet below the elevation of the trail. Finally, specialty guiderail made from pressure treated lumber was designed to maintain the aesthetic appeal of the trail.
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