The level of street-network sprawl in new development in Idaho peaked in 1991-2005. To get a sense of how street development has changed in Idaho, we can consider two of its most populous cities: Boise and Nampa. Disconnectivity in the most populous cities in Idaho follow the same region trend.

How do development practices in Idaho fare in comparison to others in United States? Most recently in 2006-2020, street construction in Idaho was the 6th-most disconnected out of the 44 regions in United States. Its position in the ranks since 1975 has risen; relative to other regions in United States, street construction in Idaho has become more disconnected. Idaho ranked 16th in 1975, 8th in 1976-1990, 9th in 1991-2005 and 6th in 2006-2020.

As of 2020, the city with the most disconnected street network in Idaho is Nampa with an SNDi of 3.58, which is relatively sprawly. Conversely, the most connected city is Boise with an SNDi of 3.51, which is relatively sprawly. See trends for these cities: Boise, Nampa

The level of street-network sprawl in the aggregate network in Idaho rose steadily. To get a sense of how the aggregate street network has changed in Idaho, we can consider two of its most populous cities: Boise and Nampa. Out of the two cities, Boise does not follow the same trend as the region. The level of street-network sprawl in the aggregate network in Boise peaked in 1991-2005.

To date, Idaho is the 17th-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 Idaho has become more connected. Idaho ranked 16th in 1975, 13th in 1976-1990, 17th in 1991-2005 and 17th in 2006-2020.