Description
93 km (57 mi) long.
History
Historically the name Castor River was applied to a 230 km (142 mi) long stream. However, in the early 20th century, the Little River Drainage District constructed the Castor River Diversion Channel, which bisected the Castor River, causing the northern section to be diverted into the diversion channel, and separating the southern portion from its original headwaters. In 2007, the BGN approved a proposal to rename the two portions Upper Castor River and Lower Castor River. According to Robert Ramsay’s Missouri Place Names file (1934), Schoolcraft mentioned the Castor River as early as 1818; the name is of French origin and means “beaver.”