^ a b c dThe majority of the Castor and Whitewater rivers have been diverted to drain directly to the Mississippi via the Headwater Diversion Channel, but the lower portions of both rivers still drain to the Little River."Headwater Diversion Basin Watershed: Executive Summary". Archived from the original on June 12, 2008. Retrieved July 11, 2007.
References
USGS Geographic Names Information Service
USGS Hydrologic Unit Map - State of Missouri (1974)