At head of title: War Department, Corps of Engineers, Unites States Army
Compiled from maps of a survey of Upper Mississippi River from Hastings, Minnesota to Grafton, Illinois made by W.N. Brown, Inc., Washington, D.C. in 1929 and 1930, and from maps prepared by the United States Engineer Office, St. Paul, Minnesota from available surveys between Minneapolis, Minnesota and Hastings, with additions from notes and surveys made in connection with the nine foot channel project. Partly redrawn and revised to conform with latest available data