CREATE TABLE table_name_8 (location_ VARCHAR, l_ VARCHAR, river_mile VARCHAR, locks_ VARCHAR, _dam VARCHAR)

What is the location of the river mile that is larger than 938.9, and Olmsted Locks and Dam?
SELECT location_ AS "l_" FROM table_name_8 WHERE river_mile > 938.9 AND locks_ & _dam = "olmsted locks and dam"
SELECT "location_" AS "l_" FROM "table_name_8" WHERE "olmsted locks and dam" = "locks_" & "_dam" AND "river_mile" > 938.9