Keechelus Lake (Wikipedia)

eastbound on Interstate 90

Cle Elum, Washington (Wikipedia) Cle Elum (/kli ˈɛləm/ klee ELL-um) is a city in Kittitas County, Washington, United States. The population was 1,872 at the 2010 census. About 84 miles (135 km) by car from Seattle, Cle Elum is a popular area for camping and outdoor activities. It is also unofficially considered the starting point of Eastern Washington when driving east on I-90 from Seattle, although this is somewhat arbitrary since many consider either the town of Easton, anywhere east of Keechelus Lake, or the wildlife crossing bridge over I-90 to be the starting point.

Keechelus Lake (/ˈkɛtʃələs/) is a lake and reservoir in the northwest United States, near Hyak in Kittitas County, Washington. Approximately fifty miles (80 km) southeast of Seattle and a few miles southeast of Snoqualmie Pass, it is the source of the Yakima River.

Cascade Range (Wikipedia) The Cascade Range or Cascades is a major mountain range of western North America, extending from southern British Columbia through Washington and Oregon to Northern California. It includes both non-volcanic mountains, such as many of those in the North Cascades, and the notable volcanoes known as the High Cascades. The small part of the range in British Columbia is referred to as the Canadian Cascades or, locally, as the Cascade Mountains. The highest peak in the range is Mount Rainier in Washington at 14,411 feet (4,392 m).
Kittitas County, Washington (Wikipedia) Kittitas County (/ˈkɪtɪtæs/) is a county located in the U.S. state of Washington. At the 2020 census, its population was 44,337. Its county seat and largest city is Ellensburg. The county was created in November 1883 when it was carved out of Yakima County. Kittitas County comprises the Ellensburg, Washington, Micropolitan Statistical Area.

Interstate 90 (Wikipedia) Interstate 90 (I-90) is an east–west transcontinental freeway and the longest Interstate Highway in the United States at 3,021 miles (4,862 km). It begins in Seattle, Washington, and travels through the Pacific Northwest, Mountain West, Great Plains, Midwest, and the Northeast, ending in Boston, Massachusetts. The highway serves 13 states and has 16 auxiliary routes, primarily in major cities such as Chicago, Cleveland, Buffalo, and Rochester.
Snoqualmie Tunnel (Wikipedia) The Snoqualmie Tunnel is a former railroad tunnel near Snoqualmie Pass in the U.S. state of Washington, located east of Seattle. The tunnel crosses the Cascade Range about three miles (5 km) south of the pass, which is used by Interstate 90, on the border between King County and Kittitas County. It is 11,894 feet (2.253 mi; 3.625 km) long and is at an approximate elevation of 2,600 feet (790 m) above sea level, just north of Keechelus Lake. Its east portal is at Hyak.

Snoqualmie Pass (Wikipedia) Snoqualmie Pass is a mountain pass that carries Interstate 90 (I-90) through the Cascade Range in the U.S. state of Washington. The pass summit is at an elevation of 3,015 feet (919 m), on the county line between Kittitas County and King County.