Lane closures will occur Tuesday morning on Route 51 north of the Henry Mancini Bridge in Aliquippa to the Rochester Monaca Bridge in Monaca, PennDOT said.

Traffic will be reduced to a single-lane, alternating use daily as needed between8 a.m. and 4 p.m. through mid-September. Geotechnical engineering crews will be conducting subsurface investigations for a future improvement project.