Ohio Station was demolished to make way for construction of the new freeway. In late 1956, it opened from the Boulevard of the Allies (then US 22/US 30) near the Birmingham Bridge east to Bates Street, with the eastbound lanes opening September 10 and westbound opening September 29. The other downtown sections opened in segments from January 17, 1958, to 1959, the total cost of the parkway at this time came to $112.11 million (equivalent to $ in ). The $6.31-million (equivalent to $ in ) Fort Pitt Bridge opened June 19, 1959, followed by the $16-million (equivalent to $ in ) Fort Pitt Tunnel on September 1, 1960, using the West End Bypass (PA 51) and Carson Street (PA 837) as detours until the Fort Pitt Tunnel opened. The Parkway East ended in Churchill, with eastbound traffic continuing ahead on the William Penn Highway, until the $11.12-million (equivalent to $ in ) extension east to the Pennsylvania Turnpike in Monroeville opened October 27, 1962. The final piece of Parkway West (the part which has never had an Interstate route number), from PA 60 west to the US 22/US 30 split at Imperial, opened in 1964. Early plans for that section would have instead taken it from PA 60 where it splits with PA 60 Bus. northwest to US 30 near Campmeeting Road at Clinton. The next section that opened was in 1968 from the present-day exit 2 with PA 18 to where PA 18 intersects with the present-day PA 760 just north of I-80 and the western terminus of I-376. Work began on the Beaver County sections of I-376 (in between Chippewa Township and the Airport Parkway) in 1971 and would finish by 1976. The following year, the northern section finished construction, which would leave a gap between New Castle and Chippewa Township for the next 15 years. Until the middle section was completed, in order to continue on the highway, travelers had to use US 422, PA 168, PA 18, PA 251, and PA 51 before returning to the highway. Until that section opened, the present-day exit 12A marked the southern terminus of the northern section of PA 60 as an "END 60" sign was located near the exit. In the early to mid-1980s, the entire section from downtown to Monroeville was refurbished. The next leg of the route opened to PA 108 in 1991 and to PA