An act of the legislature of 1846 amended the Janesville dam act, providing for a head of four feet and a lock.

The evidence

• “The dam was erected in pursuance of this act and is what is known as the upper dam in the city of Janesville. This act was amended by an act of the legislature of 1846 by repealing section 2, and substituting a new section providing for a head of four feet and a lock to be completed as soon as Rock river should be improved and rendered navigable from the southerly line of the territory to the village of Janesville.”

  1908-brown-rock-county/05-historic-evolution.md, Vol. 1, PDF p. 135 / book p. 121

  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