Columbia remain as Belt Road between Chevy Chase and Tenleytown. North of MD 186's terminus, the route is followed by modern MD 410 to Rock Creek, then is lost before resuming as Brookville Road in Silver Spring, which ends at Seminary Road west of MD 97. Brookville Road was paved as a macadam road by Montgomery County with state aid from Western Avenue to Thornapple Street by 1910. MD 186 was extended north to MD 410 when that highway was built between 1928 and 1930. Beyond widening and resurfacing, the state highway has not changed since. Junction list See also References External links MDRoads: MD 186 186 Maryland Route 186