Coordinates: 47°23′41″N 121°23′47″W / 47.3947°N 121.3963°W
The Snoqualmie Tunnel is an abandoned railroad tunnel in the northwest United States, east of Seattle in the Cascade Range of Washington, about three miles (5 km) south of Snoqualmie Pass. At the border of King County and Kittitas County, the tunnel is 2.3 miles (3.7 km) in length. Its east portal is at Hyak, close to exit 54 of Interstate 90, at an approximate elevation of 2,600 feet (790 m) above sea level, just north of Keechelus Lake.
The tunnel now serves as part of a rail trail in Iron Horse State Park. The trail is called the John Wayne Pioneer Trail, but is also called the Iron Horse Trail. It closed January 30, 2009 and reopened July 5, 2011 after renovations to the walls, ceiling, and path were completed.