U.S. Route 90
U.S. Route 90 (US 90) is an east–west United States highway. Despite the "0" in its route number, US 90 never was a full coast-to-coast route; it has always ended at Van Horn, Texas with the exception of a short-lived northward extension to US 62/US 180 near Pine Springs, Texas which lasted less than a year, and the signs on that segment were changed to Texas State Highway 54, traveling from Interstate 10 (I-10) at exit 140A and heading to its northern terminus at US 62/US 180.
Interstate 90 in Washington
I-90 continues in a southern arc around several mountains in the Alpine Lakes Wilderness while following the South Fork of the Snoqualmie River. At the east end of the arc near the Asahel Curtis Picnic Area, the freeway's westbound and eastbound lanes are split by a wide median that includes the Denny Creek Campground. I-90 continues northeast on two high viaducts and ascend to Snoqualmie Pass, the lowest of the state's three major Cascades passes at an elevation of . The pass handles 28,000 vehicles (including 6,500 trucks) on an average weekday, making it one of the busiest mountain highways in the United States. I-90 intersects the Pacific Crest Trail and SR 906 at the pass, providing access to the adjacent to the Snoqualmie ski resort. The freeway travels south into Kittitas County and intersects SR 906 Spur at Hyak. I-90 continues south through the Wenatchee National Forest along the eastern shore of Keechelus Lake, under steep cliffs that were cut using controlled blasting. At the south end of the lake, the freeway passes under a arched wildlife bridge, which is the first to be built in Washington state.