Farther north, Yaquina Bay and Tillamook Bay also admit small steamboats.
The Coquille river is navigable for about 37 m., the Yaquina river for 23 m.
The principal railways are: that of the Oregon Railroad & Navigation Company (controlled by the Union Pacific), which crosses the north-eastern corner of the state and then runs along the bank of the Columbia river to Portland; three lines of the Southern Pacific in the Willamette Valley, the main line connecting Portland with San Francisco; the Astoria & Columbia River, connecting Portland and Astoria; the Coos Bay, Roseburg & Eastern Railroad & Navigation Company (owned by the Southern Pacific), connecting Coos Bay with one of the Southern Pacific lines; and the Corvallis & Eastern (owned by the Southern Pacific), connecting Yaquina Bay with all three lines of the Southern Pacific. Throughout the Cascade Mountain Region and the great semi-arid region east of those mountains, which together embrace more than two-thirds of the state's area, there is not a railway.
There are four customs districts: southern Oregon, with Coos Bay as the port of entry; Willamette, with Portland as the port of entry; Oregon, with Astoria as the port of_entry; and Yaquina, at the mouth of the Yaquina river.