From that same terminus, Business Route 126 heads east, also cosigned with Route 99, along Seventh Avenue. This route then proceeds through Eugene's downtown core and turns south at an interchange near the Ferry Street Bridge. After two blocks, Business Route 126/Route 99 turns east again on East Broadway, which becomes Franklin Boulevard at Alder Street. Franklin Boulevard separates the south shore of the Willamette River from the northern edge of the University of Oregon campus. Past the university campus and surrounding business district, Business Route 126 and Route 99 split. Route 99 joins southbound I-5, while Route 126 continues eastbound through the community of Glenwood. It then crosses the Willamette River and enters the city of Springfield. Business Route 126 continues east through downtown Springfield, eventually rejoining the main stem of Route 126 in the Thurston neighborhood of the city's east end. At the western terminus of I-105, Oregon 126 turns west and is cosigned with Oregon 99 for a mile and a half. At Garfield Street, the highways separate. Route 126 becomes the Florence-Eugene Highway, proceeding south on Garfield five blocks to West 11th Avenue, which carries the highway out of Eugene toward the Oregon Coast. In west Eugene, Route 126 intersects the western terminus of Oregon Route 569 (Beltline Highway). Between Eugene and the rural-suburban city of Veneta, Route 126 passes through farmland and crosses the southern portion of Fern Ridge Reservoir, a popular recreation magnet for the area. A Coos Bay Rail Link line, originally part of Southern Pacific, built to Coos Bay in 1914, parallels Route 126 for much of its length between Eugene and Veneta. Two miles west of Veneta, Route 126 begins its ascent into the Coast Range, passing the town of Noti, proceeding through Cougar Pass, elevation . Cougar Pass marks the division point between the watersheds of the Willamette and Siuslaw rivers. As it descends toward the Siuslaw Valley and the coast, Route 126 follows first Wildcat Creek and then the Siuslaw River itself. The town of Walton is passed. The Coos-Bay Rail Link is also visible from time to time of this section as well the following section from Mapleton to Florence. The Petersen Tunnel (completed in 1957) at marks the point where the last barrier to a one-hour drive from Eugene to the coast was breached. Also called the Mapleton Tunnel or the Knowles Creek Tunnel, in 1988 the tunnel was renamed for Ralph A. Petersen (1902–1986), the Lane County Commissioner who was instrumental in completing it.