ALLEGHENY COUNTY — The Pennsylvania Turnpike will be closed eastbound and westbound between the Butler Valley interchange (Exit 39) and Allegheny Valley interchange (Exit 48) from 11:59 p.m. Saturday until 5 a.m. Sunday.

Exiting traffic will use these detours:

Eastbound traffic will exit at Butler Valley, follow Route 8 south for 10 miles, take the ramp to Route 28 north, take Exit 11 to Route 910 east and turn left on Freeport Road to the Allegheny Valley interchange.

Westbound traffic will exit at Allegheny Valley, follow Freeport Road south, turn right to Route 910 west, take the ramp to Route 28 south, take the ramp to Route 8 north and go 10 miles to the Butler Valley interchange.

The closure is needed while crews from Gulisek Construction erect bridge beams for the overhead bridge where Middle Road crosses over the turnpike in Hampton Township.

The bridge was closed to traffic March 11. A replacement bridge is to be done this fall.