On May 3, 1905, the territory of the Dioceses of La Crosse and Green Bay was brought together to form the Diocese of Superior, reducing the diocese to the counties of Adams, Buffalo, Chippewa, Clark, Crawford, Dunn, Eau Claire, Grant, Iowa, Jackson, Juneau, La Crosse, Lafayette, Marathon, Monroe, Pepin, Pierce, Richland, Sauk, Trempealeau, Vernon, and Wood, an area of 17299 sqmi .