CREATE TABLE table_63447 ("Locks & Dam" CLOB, "Location [L ]" CLOB, "River Mile" FLOAT, "Lock Side" CLOB, "Lock Lift/Drop  ( in feet ) " CLOB, "Pool Length  ( miles ) " CLOB)

What is the highest River Mile that has a pool length of 42.2 miles or a lock/lift drop of 21 feet?
SELECT MAX("River Mile") FROM table_63447 WHERE "Pool Length (miles)" = '42.2' AND "Lock Lift/Drop (in feet)" = '21'
SELECT MAX("River Mile") FROM "table_63447" WHERE "Lock Lift/Drop (in feet)" = '21' AND "Pool Length (miles)" = '42.2'