from a segment of Iowa Highway 13 from Marquette to Minnesota. Iowa 13's northernmost were truncated at a point west of McGregor at its intersection with U.S. Highway 52. Iowa 13 overlapped US 52 and US 18 for ; the remaining became Iowa 76. In 1989, Iowa 76 was extended to the south when a new bypass around McGregor was opened. US 18 was moved onto the bypass and the old road became Iowa 76, but was marked as U.S. Highway 18 Business. The only proof of Iowa 76 along US 18 Bus. are small Iowa 76 route markers above the mile markers. Major intersections References External links End of Iowa 76 and Business US 18 (Clayton Co.) at Iowa Highway Ends Transportation in Clayton County, Iowa 076 Transportation in Allamakee County, Iowa U.S. Route 18 076