SELECT location_[l_] FROM table_name_8 WHERE river_mile > 938.9 AND locks_ & _dam = "olmsted locks and dam"
Berapa lokasi mil sungai yang lebih besar dari 938.9, dan kunci olmsted dan bendungan?
CREATE TABLE table_name_8 (location_ VARCHAR, l_ VARCHAR, river_mile VARCHAR, locks_ VARCHAR, _dam VARCHAR)