PennDOT has closed the Market Street Bridge over the Little Juniata Creek in Duncannon for up to 90 days.
The bridge was closed Wednesday morning so that the superstructure of the 82-year-old steel I-beam bridge can be replaced. The bridge is considered structurally deficient.
PennDOT has set up a detour which follows Route 11/15, Route 22/322 and Route 849.
The $1.3 million project is scheduled to be completed by the end of September.