user: Question: In what year was the bridge in Clarkdale built?
Columns: ['Name', 'Built', 'Listed', 'Location', 'County']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1931 Tempe Bridge', '1931', '1981-08-13', 'Tempe', 'Maricopa']
SQL:

assistant: SELECT "Built" FROM "Table" WHERE "Location" = 'Clarkdale';