Summer 1858
A new church building was erected at a cost of about $1,700, following the April 7 resolution.
Nation and worldGrade A · 1 independent source
The evidence
“church in the spring of 1856. According to resolutions passed at a meeting held April 7, 1858, a church building was erected during the summer of this year, costing about $1,700. In 1860 the congregation participated in the formation of the Scandinavian Augustana Synod, which was organized at the old frame church at Bergen Postoffice, Wis., at a meeting held there June 5-12.”
1908-brown-rock-county/31-smaller-cities-villages-towns.md, Vol. 2, PDF p. 134 / book p. 643
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