terminus south of Loys Station in 1932. All of MD 72 except the portion through Creagerstown that is now MD 550 was removed from the state highway system in 1956. MD 73 Maryland Route 73 was the designation for Yellow Springs Road from the old Frederick city limits on what is now 7th Street south of the US 15 freeway north to Yellow Springs. The first section of MD 73 was constructed as a macadam road for about north of the city limits in 1928. The highway was extended northwest to what is now Clover Hill by 1930 and to Tuscarora Creek by 1933. MD 73 was completed to Yellow Springs in 1935. MD 73 between Military Road and Clover Hill passed along the edge of and then directly through Fort Detrick until 1957, when the road through the military base was closed to the public. Yellow Springs Road was relocated around Fort Detrick from Clover Hill southeast to connect with Rosemont Avenue in Frederick. By 1961, the southern end of MD 73 was at Clover Hill. The remainder of MD 73 was removed from the state highway system in 1969. MD 74 Maryland Route 74 was the designation for Oppossumtown Pike from the old Frederick city limits on what is now Motter Avenue south of the US 15 freeway north to Poole Jones Road. MD 74 was paved as a macadam road north about from the city limits between 1926 and 1928. The highway was extended north to its northern terminus by 1939. MD 74 was removed from the state highway system in 1956. MD 78 Maryland Route 78 was the designation for Ballenger Creek Pike from what was the southern terminus of MD 351 near Adamstown north to US 340 near Frederick in southern Frederick County. The first portion of MD 78 was completed by 1927; the remainder of the highway was completed by 1938. MD 78 was replaced by an extension of MD 180 in 1970. All of former MD 78 became MD 351 in 1989. MD 81 Maryland Route 81 was the designation for Sabillasville Road and Military Road from MD 806 (former US 15) in Thurmont north to Fort Ritchie in northernwestern Frederick County and far northeastern Washington County. MD 81 was completed from Thurmont to Sabillasville by 1927. The highway was replaced by a northern extension of MD 550 in 1977. MD 82 Maryland