The level of street-network sprawl in new development in Washington peaked in 1976-1990. To get a sense of how street development has changed in Washington, we can consider three of its most populous cities: Seattle, Tacoma and Spokane. Out of the three cities, Seattle and Spokane do not follow the same trend as the region. The level of street-network sprawl in new development in Seattle peaked in 1991-2005. The level of street-network sprawl in new development in Spokane rose steadily.

How do development practices in Washington fare in comparison to others in United States? Most recently in 2006-2020, street construction in Washington was the 28th-most disconnected out of the 44 regions in United States. Its position in the ranks since 1975 has not changed. Washington ranked 28th in 1975, 39th in 1976-1990, 34th in 1991-2005 and 28th in 2006-2020.

As of 2020, the city with the most disconnected street network in Washington is Auburn with an SNDi of 4.23, which is sprawly. Conversely, the most connected city is Spokane with an SNDi of 2.15, which is well-connected. See trends for these cities: Spokane, Auburn

The level of street-network sprawl in the aggregate network in Washington rose steadily. To get a sense of how the aggregate street network has changed in Washington, we can consider three of its most populous cities: Seattle, Tacoma and Spokane. Disconnectivity in the most populous cities in Washington follow the same region trend.

To date, Washington is the 33rd-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 Washington has become more connected. Washington ranked 28th in 1975, 31st in 1976-1990, 34th in 1991-2005 and 33rd in 2006-2020.