table: [['name', 'built', 'listed', 'location', 'county'], ['b & o railroad potomac river crossing', '1894 , 1931', '1978 - 02 - 14', 'harpers ferry , west virginia', 'washington'], ['b & o bridge', 'ca1867', '1977 - 11 - 23', 'keedysville', 'washington'], ['bennies hill road bridge', 'ca1889', '1979 - 06 - 27', 'middletown', 'frederick'], ['bloomington viaduct', '1851 , 1916', '1976 - 11 - 21', 'bloomington', 'garrett'], ['bollman suspension and trussed bridge', '1869', '1972 - 10 - 18', 'savage', 'howard'], ['bullfrog road bridge', '1908', '1978 - 11 - 21', 'taneytown', 'carroll'], ['carrollton viaduct', '1828 , 1829', '1971 - 11 - 11', 'baltimore', 'baltimore city'], ["casselman 's bridge , national road", '1813', '1966 - 10 - 15', 'grantsville', 'garrett'], ['crum road bridge', 'ca1880', '1978 - 12 - 28', 'walkersville', 'frederick'], ['fourpoints bridge', 'ca1876', '1978 - 11 - 29', 'emmitsburg', 'frederick'], ["gilpin 's falls covered bridge", 'ca 1855', '2008 - 12 - 03', 'north east', 'cecil'], ['howard street tunnel', '1890 , 1895', '1973 - 07 - 02', 'baltimore', 'baltimore city'], ['jericho covered bridge', '1865 , 1937', '1978 - 09 - 13', 'jerusalem , kingsville', 'baltimore , harford'], ['legore bridge', '1898 - 1900', '1978 - 09 - 18', 'woodsboro', 'frederick'], ['lombard street bridge', '1877 , 1974', '1972 - 09 - 27', 'baltimore', 'baltimore city'], ['loys station covered bridge', 'ca1860', '1978 - 06 - 23', 'thurmont', 'frederick'], ['old mill road bridge', '1882', '1979 - 03 - 07', 'rocky ridge', 'frederick'], ['patterson viaduct ruins', '1829', '1976 - 06 - 03', 'catonsville , ilchester', 'baltimore , howard'], ['poffenberger road bridge', '1878', '1978 - 11 - 29', 'middletown', 'frederick'], ['roddy road covered bridge', 'ca1860', '1978 - 06 - 23', 'thurmont', 'frederick'], ['thomas viaduct , baltimore & ohio railroad', '1835', '1966 - 10 - 15', 'relay', 'baltimore , howard'], ['union arch bridge (cabin john aqueduct)', '1864', '1973 - 02 - 28', 'cabin john', 'mongtomery'], ['utica covered bridge', 'ca1860', '1978 - 06 - 23', 'thurmont', 'frederick'], ['waverly street bridge', '1892', '1984 - 09 - 07', 'westernport', 'allegany'], ["wilson 's bridge", '1819', '1982 - 03 - 15', 'hagerstown', 'washington']]
ref: Casselman 's Bridge , National Road in Grantsville was the earliest Built in 1813
template: [ENT] in [ENT] was the earliest [ENT] in [ENT]