 Construction on the eastern and western sides of the state, in Burlington and Glenwood, respectively, did result in parts of the highway becoming four lanes, other highway projects were cut back during the 1970s recession.At Glenwood, the discovery and handling of Native American remains led to the Native American Graves Protection and Repatriation Act.In the mid 1990s, the Iowa Department of Transportation began an ambitious project to expand seven important corridors, one of which connected Des Moines to Burlington.