Moving into the 20th century, the town became the center of a lumbering and farming community. The valley land was drained, levees were constructed and farms were cleared on the benches. The rich Kootenai Valley became known as the "Nile of the North," while the Bonners Ferry Lumber Company grew to be one of the world's largest lumber mills. The downtown took shape as brick buildings were constructed, replacing those on stilts. Completion of the Libby Dam in 1975 lessened the threat of serious flooding. Today, much of Main Street dates from this initial period of solid, permanent construction.