The state Department of Transportation is beginning a long-term, single-lane restriction on northbound Interstate 79 in Lawrence County beginning 9 a.m. Monday, July 31, as part of a highway reconstruction project from Butler County to Mercer County.

Traffic will be shifted to the shoulder during the single-lane restriction that begins Monday and will remain in place 24 hours-a-day through mid-September. Crews are conducting improvement work including excavation, slab repairs and expansion dam work. Work on the southbound lanes is expected to start in August.

The work is part of the $11.62 million project along I-79 from Butler County to Mercer County. Work includes milling and resurfacing, base repair work, rest area improvements, guide rail upgrades, drainage improvements, minor structure repairs and other miscellaneous construction work.