CREATE TABLE table_204_507 (id DECIMAL, "bridge name" TEXT, "location" TEXT, "year completed" DECIMAL, "total length" TEXT, "carries" TEXT)

which bridge is longer - old youngs bay bridge or oregon city bridge ?
SELECT "bridge name" FROM table_204_507 WHERE "bridge name" IN ('old youngs bay bridge', 'oregon city bridge') ORDER BY "total length" DESC LIMIT 1
SELECT "bridge name" FROM "table_204_507" WHERE "bridge name" IN ('old youngs bay bridge', 'oregon city bridge') ORDER BY "total length" DESC NULLS LAST LIMIT 1