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.

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.