 MD 413 was widened to from Crisfield to Marion Station by 1930.The first section of the state highway to be moved to its present course was through Westover; the new highway was built as a concrete road in conjunction with the relocation of US 13 in 1934 and 1935.Sam Barnes Road between the new alignments of MD 413 and US 13 became MD 757 by 1946 and MD 673 in 1950.