 Their subsequent lab analysis and not immediate reburial created a controversy that eventually led to the Native American Graves Protection and Repatriation Act.In the 1990s and 2000s, the highway between Ottumwa and West Burlington was widened to four lanes as part of a project to improve the Des Moines-to-Burlington corridor.Since the early 1990s, modern bridges that can handle high volumes of high-speed traffic have been built at both the eastern and western state lines.