April 12, 1843
An act was approved appointing commissioners to alter the Beloit–Madison road and lay out roads from Janesville to Ellis's Mill and to Mineral Point.
The regionGrade A · 1 independent source
The evidence
“By another act of the territorial legislature, approved April 12, 1843, commissioners were appointed to alter the road from Beloit to Madison; to lay out a road from Janesville to Ellis's Mill in Walworth county, and a road from Janesville to Mineral Point.”
1908-brown-rock-county/05-historic-evolution.md, Vol. 1, PDF p. 136 / book p. 122
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