 MD 117 was widened from from Old Germantown to Little Seneca Creek in 1948.The gap between Old Germantown and Clopper was filled with a modern highway, including the modern bridge across Great Seneca Creek, and was brought into the state highway system in 1951 and 1952.MD 117 became a single highway when the county highway between Boyds and Old Germantown was brought into the state highway system in 1956.