user: Question: What is the county of the bridge in Boulder?
Columns: ['Name', 'Built', 'Listed', 'Location', 'County']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['AJX Bridge over South Fork and Powder River', '1931, 1932', '1985-02-22', 'Kaycee', 'Johnson']
SQL:

assistant: SELECT "County" FROM "Table" WHERE "Location" = 'Boulder';