Table:
text: List of bridges on the National Register of Historic Places in Maryland
List of bridges on the National Register of Historic Places in Maryland
List of bridges on the National Register of Historic Places in Maryland
Name_ Built Listed Location_ County
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 ca.1860 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 ca.1860 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 ca.1860 1978-06-23 Thurmont Frederick

Question: What is the County of Howard Street Tunnel under the List of Bridges on the National Register of Historic Places in Maryland?

Question: When was the 1864 bridge listed on Maryland's National Register of Historic Places?