All of the portion lying southwest of Sugar river (Avon area) was surveyed by the general government during the year 1833.

The evidence

• “All of that portion lying southwest of Sugar river was surveyed by the general government during the year 1833 ; and the balance in 1834. By an act of the territorial legislature, approved February 11, 1847, Avon was set apart as a township and named, and a ''town meeting" directed to be held on the first”

  1908-brown-rock-county/31-smaller-cities-villages-towns.md, Vol. 2, PDF p. 172 / book p. 679

  Brown, William Fiske, editor. Rock County, Wisconsin: A New History of Its Cities, Villages, Towns, Citizens and Varied Interests, from the Earliest Times, Up to Date. Chicago: C. F. Cooper & Co., 1908. 2 vols. archive.org/details/rockcountywiscon01brow, archive.org/details/rockcountywiscon02brow.

  Grade A: Found on a page of one of our sources