K-30 is a 1.95-mile-long (3.14 km) state highway running from Interstate 70 (I-70) north to the southern city limit of Maple Hill. A previous designation existed in the late 1920s which was removed by 1932. It existed in Jefferson County. The current route was established in the early 1930s.

Interstate 70 (I-70) is a mainline route of the Interstate Highway System in the United States connecting Cove Fort, Utah, to Baltimore, Maryland. In the US state of Kansas, I-70 extends just over 424 miles (682 km) from the Colorado border near the town of Kanorado to the Missouri border in Kansas City. I-70 in Kansas contains the first segment in the country to start being paved and to be completed in the Interstate Highway System. The route passes through several of the state's principal cities in the process, including Kansas City, Topeka, and Salina. The route also passes through the cities of Lawrence, Junction City, and Abilene.