Work on the new Lowther Street bridge over Interstate 83 in Lemoyne will close the highway to through-traffic for several hours Monday night.
PennDOT spokesman Mike Crochunis said that weather permitting, drivers on I-83 and Route 581 will first encounter a single-lane restriction in each direction at 9 p.m. followed by an overnight detour between 11 p.m. and 5 a.m.
Construction crews will be setting bridge beams for the new Lowther Street bridge.
Traffic on Lowther Street is currently using a temporary structure to cross I-83 while a new bridge is built.
The work is part of a nearly $8 million project to build a new two-span bridge large enough to accommodate four lanes of I-83, as well as three ramps underneath, in order to eliminate the bottleneck on I-83 North approaching Harrisburg and Route 581 West.
I-83 North will be directed off at Brandt Avenue, turn right onto Lowther Street through Lemoyne back to I-83 North. I-83 North traffic headed to Route 581 West will also follow Brandt Avenue to Lowther Street and continue on I-83 North across the Susquehanna River into Harrisburg and be directed off at Exit 44-A for 13th Street to I-83 South back across the Susquehanna River to Route 581 West.
I-83 South will be directed off at Exit 42 for Lemoyne follow Lowther Street over the interstate, turn left at 10th Street and back to I-83 South.
Route 581 East traffic headed to I-83 South will be directed to I-83 North to Exit 41-B for Highland Park, turn right onto Lowther Street through Lemoyne over the interstate and turn left at 10th Street to I-83 South.
PennDOT expects work on the new Lowther Street bridge to be completed by the end of May.