CREATE TABLE table_204_799 (id DECIMAL, "name" TEXT, "built" TEXT, "listed" TEXT, "location" TEXT, "county" TEXT, "type" TEXT)

fairground street bridge and confederate avenue brick arch bridge were both built in which county ?
SELECT "county" FROM table_204_799 WHERE "name" = 'fairground street bridge'
SELECT "county" FROM "table_204_799" WHERE "name" = 'fairground street bridge'