CREATE TABLE "references" (
  "name" text,
  "built" text,
  "listed" text,
  "location" text,
  "county" text
);

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

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

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