Greenway Trust Priority Area: Upper Yakima BasinMap Categories: Cultural and Natural Heritage Sites In the Chinook Trade Jargon, Hyak is a word for “swift” or “fast.” The unincorporated community of Hyak is located at the eastern portal of the Snoqualmie Tunnel. The community once boasted a railroad station, a post office and school. The Snoqualmie Tunnel opened in 1914 to allow passage of the Chicago, Milwaukee, St....