A series of traffic restrictions and a temporary detour are set to begin on Monday as a PennDOT contractor replaces a bridge on Route 711 in Ligonier Township.

Located between Slater and Peters roads, the bridge carries Route 711 over Koffer Run — a tributary of Loyalhanna Creek — on the stretch of the highway that connects Stahlstown and Ligonier.

Depending on weather conditions, different phases of the bridge project are scheduled as follows:

• Monday through Wednesday — Daylight single-lane restrictions with traffic controlled by flagging;

• July 12-15 — Closure of the road to all traffic. Posted detours will be in place;

• July 15 to Aug. 23 — Traffic restricted to the southbound lane of Route 711 and controlled by temporary traffic signals;

• Aug. 23 to Oct. 3 — Traffic restricted to the northbound lane of Route 711 and controlled by temporary signals;

• Oct. 3 through late October — All traffic controlled by flagging.

Passenger vehicles will be detoured along Darlington-Rector Road and routes 381 and 30.

Trucks will be redirected along routes 31 and 982, Kecksburg Road and routes 981 and 30.

In the $1.8 million project, crews from JVI Group will replace the bridge over Koffer Run with 72-inch reinforced concrete pipes and three eight-foot inlet boxes.