Then, the project will take about 130 days from June to October, Seibert said.
Traffic might be rerouted some or all of that time using a temporary modular bridge, or Bailey Bridge, that will extend Canal Street over the C&O Canal, an information page distributed during Monday's council meeting says.
Allegheny Energy and the Park Service are working on an access route that ties into a power plant service road, the page says.
The information says the Wendel Bollman Bridge Co. in Baltimore built the bridge about 125 years ago.
"The Salisbury Street Bridge does not meet current (National Park Service) requirements for bridge construction and safety," the information page says. "The bridge has carried traffic since its construction and is showing signs of fatigue. The existing timber deck is in fair to poor condition and the guardrails are not crash tested. The existing pedestrian bridge does not meet current NPS safety standards."
The project entails replacing the bridge's timber beams with steel beams that have a timber facade, according to the information page.
Seibert said the truss will be cleaned and painted, the bridge deck will be replaced with a modern version and a timber curb and guardrail will be added.