The Yellow River originates in eastern Clark County. It flows through Pittsville, Dexter and Babcock in Wood County, and Necedah in Juneau County. Past Necedah, it flows into Castle Rock Lake where it meets the Wisconsin River near Buckhorn State Park. In Dexter, or Dexterville, it is dammed to create Lake Dexter. The stretch from Necedah to Castle Rock Lake has numerous oxbows.