The highway is legislated to begin in Ritzville at a junction with concurrent highways I-90 and US 395 and travel east through a mixture of farm and desert landscapes, crossing over the Adams–Whitman county line in the process. A junction with SR 23 near Ewan is to be the eastern terminus of the highway. Currently travelers wishing to travel between the two communities take the freeway to Sprague, then head southeast along SR 23.
The highway was first proposed in 1945, with the support of the Ritzville Chamber of Commerce and senator Elmer C. Huntley of Colfax. An earmark of just over $1.5 million (equivalent to $47 million in 2011). was set aside for the project to be used after the war. The proposed highway's designation was changed to the current designator, SR 230, after the 1964 state highway renumbering. The legal definition of SR 23, the highway's proposed eastern terminus, was changed during the 1987 legislative session to remove a reference of a junction with SR 230.
^United States nominal Gross Domestic Product per capita figures follow the "Measuring Worth" series supplied in Johnston, Louis; Williamson, Samuel H. (2014). "What Was the U.S. GDP Then?". MeasuringWorth. Retrieved April 18, 2014. These figures follow the figures as of 2012.
^"Senate Bill No. 5413". 50th Legislature - 1987 Regular Session. Washington State Legislature. Retrieved February 13, 2011.