Pennsylvania Transportation Secretary Barry Schoch said the state DOT and a private-sector team called Plenary Walsh Keystone Partners will work together in a public-private partnership to replace 558 bridges.  Under PennDOT’s Rapid Bridge Replacement Project, that private team must start construction next summer and complete all work in 36 months. The state retains ownership of the structures but the team maintains each bridge for 25 years after it is replaced.