The level of street-network sprawl in new development in Iowa rose steadily. To get a sense of how street development has changed in Iowa, we can consider three of its most populous cities: Des Moines, Davenport and Cedar Rapids. Out of the three cities, Cedar Rapids does not follow the same trend as the region. The level of street-network sprawl in new development in Cedar Rapids peaked in 1991-2005.

How do development practices in Iowa fare in comparison to others in United States? Most recently in 2006-2020, street construction in Iowa was the 8th-most disconnected out of the 44 regions in United States. Its position in the ranks since 1975 has fallen; relative to other regions in United States, street construction in Iowa has become more connected. Iowa ranked 2nd in 1975, 6th in 1976-1990, 6th in 1991-2005 and 8th in 2006-2020.

As of 2020, the city with the most disconnected street network in Iowa is Iowa City with an SNDi of 2.53, which is relatively well-connected. Conversely, the most connected city is Cedar Rapids with an SNDi of 1.71, which is very well-connected. See trends for these cities: Cedar Rapids, Iowa City

The level of street-network sprawl in the aggregate network in Iowa rose steadily. To get a sense of how the aggregate street network has changed in Iowa, we can consider three of its most populous cities: Des Moines, Davenport and Cedar Rapids. Disconnectivity in the most populous cities in Iowa follow the same region trend.

To date, Iowa is the 4th-most disconnected out of the 44 regions in United States. Its position in the ranks since 1975 has fallen; relative to other regions in United States, the street network in Iowa has become more connected. Iowa ranked 2nd in 1975, 3rd in 1976-1990, 4th in 1991-2005 and 4th in 2006-2020.