Relief shown by contours and spot heights. Depths shown by soundings. 'Revisions made July 1931.' 'The survey of the river proper was begun July 25, and completed December 31, 1911. The valley survey began January 15, and was completed September 10, 1912. Mapping in 1913.' Scale approximately 1:24,000. Surveyed and mapped under the direction of the district engineer officer, Louisville, Ky.