 This highway was constructed as a macadam road west of Gaithersburg in 1911 and 1912 and within the town of Gaithersburg in 1914.Bucklodge Road from MD 28 near Dawsonville north to the Baltimore & Ohio Railroad (now CSX) was constructed as a macadam road by Montgomery County with state aid by 1915.Bucklodge Road was extended as a concrete road to the underpass of the railroad at Boyds east of the southern end of MD 121 in 1928.