PennDOT will close the Parkway East between the Squirrel Hill Tunnel and Exit 77 (Edgewood/Swissvale) at 9 p.m. on July 10 as it prepares to replace the aging Commercial Street Bridge.

While workers will begin restricting access to the Parkway at 9 p.m., it will take around an hour to fully close. PennDOT spokeswoman Yasmeen Manyisha said in a statement.

Interstate commuters traveling in either direction can follow a detour primarily via Penn Avenue and Fifth Avenue through Point Breeze, Shadyside and Oakland. Local commuters can take South Braddock Avenue in Swissvale, the Rankin Bridge, 8th Avenue in Homestead, and the Homestead Grays Bridge.

The full detour setup will not be completely functional until sometime on Saturday morning, Manyisha said. Flaggers employed by contractors will eventually be on site to direct traffic, she said.

PennDOT expects the Parkway East closure to last until Aug. 3.

Western Pennsylvanians should also look out for the following upcoming traffic restrictions:

Pittsburgh

• PRT’s Red Line will close in Dormont as crews replace rail crossings at Alabama Avenue and Hillsdale Avenue from Monday through Sunday. PRT is using a series of temporary shuttles to connect affected stations.

• The northbound and southbound bypass ramps on West Carson Street under the West End Circle will close beginning on Monday and from 9 p.m. to 5 a.m. on weeknights through mid-July. Crews from Duquesne Light are replacing cables. Commuters can follow posted detours.

Allegheny County

• Baptist Road in Whitehall will be detoured southbound between the intersections of Brownsville Road/Provost Road and Weyman Road/Doverdell Road beginning at 9:00 a.m. on Monday and around the clock through late October. Workers are conducting drainage improvements and asphalt restoration as part of a $5.87 million project. Commuters can follow a posted detour via Route 51.

• Single-lane restrictions will take place northbound on Parkway North (I-279) in Ross at the Jacks Run Road Bridge between Cemetery Lane and Bellevue Road on Monday from 9 a.m. to noon. Crews are inspecting the bridge’s piers.

• Single-lane restrictions will take place in both directions on West Liberty Avenue in Dormont between Key Avenue and Potomac Avenue beginning Monday and from 8 p.m. to 6 a.m. through Thursday. Workers are surveying the site.

Butler County

• Route 288 (New Castle Road) in Zelienople will close at the railroad crossing between Market Street and Halstead Boulevard beginning July 9 at 7 a.m. and through July 13 at 6:30 p.m. Workers are replacing the railroad crossing. Commuters on either side of the tracks can follow a posted detour via Route 19, Route 68 and Hartzel School Road.

Greene County

• Four intersections in Franklin will close beginning Monday at 7 a.m. and through the end of October: Porter Street and Champion Drive, Sugar Run Road and Johnson Lane, Sugar Run Road at Shadow Oaks Drive, and Orchard Road at Route 19/Mount Morris Road. Workers are constructing roundabouts. Commuters can follow posted detours at each site.

• Water Dam Road in Franklin will close between Byard Road and Route 18 beginning Monday at 7 a.m. and until late August. Crews are performing scheduled slide repairs. Commuters can follow a detour via Browns Creek Road and Garner Run Road.

Washington County

• Waterdam Road in Mount Pleasant will close between Ridge Road and Walnut Road beginning Monday and through mid-September. Crews are replacing a bridge. Commuters can follow a posted detour via Cherry Valley Road and Fort Cherry Road.