Table: bridge_historic_list
Columns: name
built
listed
location
county

Question: In what year was the bridge in Clarkdale built?
SQL: SELECT "built" FROM bridge_historic_list WHERE "location" = 'clarkdale'

Question: In what year was the Gila Bend Overpass built?
SQL: SELECT "built" FROM bridge_historic_list WHERE "name" = 'gila bend overpass'

Question: In what county is the Canyon Padre Bridge?
SQL: SELECT "county" FROM bridge_historic_list WHERE "name" = 'canyon padre bridge'