The Lawrence County Master Transportation Plan is a long-range plan that evaluates the transportation system under Lawrence County's jurisdiction. The plan analizes the current issues and needs of the transportation system while also taking into consideration anticipated economic growth and development that will affect future traffic conditions as the area continues to grow. These elements are analyzed to form a set of short-term and long-term solutions to address the transportation challenges within the county.

Lawrence County is located on the western border of South Dakota in the Black Hill region. With sustained population growth in the county and the surrounding region and increasing development outside of Spearfish and throughout the county, traffic levels and patterns are changing and will continue to change over time.