These are the 3rd and 4th new Montour Trail bridges to open this year, but the earlier two replaced existing bridges. These new ones close gaps in the trail.
They're located just east of where the trail crosses I-79, and a few miles west of where it crosses Route 19/Washington Road.
Once these open, the trail will have only two small breaks for the 36 mile stretch from its start outside Coraopolis down to Library.