CREATE TABLE table_49506 ("Name" CLOB, "Built" CLOB, "Listed" CLOB, "Location" CLOB, "County" CLOB)

In what year was the Gila Bend Overpass built?
SELECT "Built" FROM table_49506 WHERE "Name" = 'gila bend overpass'
SELECT "Built" FROM "table_49506" WHERE "Name" = 'gila bend overpass'