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

the oregon city bridge and the john mcloughlin bridge are located where ?
SELECT "location" FROM table_204_507 WHERE "bridge name" = 'oregon city bridge'
SELECT "location" FROM "table_204_507" WHERE "bridge name" = 'oregon city bridge'