Northbound Interstate 476 will be closed for 13 miles between the Lansdale and Quakertown interchanges July 20 for six hours, so construction crews can place new concrete bridge beams under the RIdge Road overpass in Salford Township.

At 12:01 a.m. July 20, all northbound traffic wil be detoured at the Lansdale Interchange, according to Mimi Doyle of the Pennsylvania Turnpike Commission. By 6 a.m., the detour will be lifted and the roadway reopened to traffic. 

Southbound I-476 will remain open to motorists.

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The detour will take drivers over Route 63 East/Sumneytown Pike to Route 309 North, to Route 663 West, reentering the turnpike at the Quakertown Interchange to continue northbound.

The northbound right lane will be closed at 8 p.m. July 19 in preparation for the construction, and the southbound left lane will be closed at 10 p.m. for four miles. 

Pennsylvania State Police and turnpike personnel will be positioned at the Lansdale Interchange to assist motorists, Doyle said.