Street-network Sprawl in Olympia, United States

What is Street-network sprawl?

Street-network Sprawl is a way to measure urban sprawl, worldwide, through the connectedness of the streets. Less sprawl means more connected, more walkable streets. Well-connected streets – like New York City’s grid – are more walkable and can be served by public transit.

The street network is permanent, and its connectivity affects the livability and environmental footprint of cities for decades and centuries to come. In places with more connected streets, residents drive less and walk more. A well-connected street network is associated with better outcomes for health, the environment, sustainable consumption, social integration, and equity.

We can quantify how connected street networks are with the Street Network Disconnectedness Index (SNDi).

SNDi -- our measure of street-network sprawl (disconnectedness)

The SNDi is a comprehensive measurement of “sprawl”. It captures:

A higher SNDi means less-connected streets – i.e., more sprawl. For the 10137 cities in our dataset, the average SNDi is 2.25, with half of the cities' SNDis falling between 1.08 and 3.25.

More information on the sprawl index can be found in these research papers:

To see the state of street-network sprawl across the globe, visit the sprawlmap.

Olympia: city in Washington, United States

What exactly constitutes the spatial extent of the city? For these aggregations, we used the Global Human Settlement Layer Urban Center Database (GHS-UCDB) to define the boundaries of the city. These cities -- or urban centers -- cover areas that are densely populated and built-up, and so may extend beyond the spatial borders of these cities that we may be familiar with. The GHS area is shaded in blue.

View Olympia, United States on the sprawlmap

Most recent snapshot: Taking into account the entire (i.e. aggregate) street network in Olympia as of 2014, the overall level of street-network sprawl is 4.61, which is highly disconnected.

Trends in street network construction: The SNDis of street construction for the respective time periods are 4.16, 6.28, 5.96 and 3.99. Street construction in Olympia increased in disconnectivity initially but has since improved. The streets constructed in 1976-1990 were the most disconnected.

Quantity of street network construction: The street network in Olympia spans a total of 805 kilometers. It is dominated by roads constructed prior to 1975. These roads have an SNDi of 4.16, which is highly disconnected.

Effect on the aggregate network: New construction in each period adds to the total stock of streets, but does not change streets that have already been built. Therefore, it has a limited effect on the street network as a whole. The SNDis of the aggregate street network in the respective time periods are 4.16, 4.59, 4.64 and 4.61. The aggregate street network in Olympia increased in disconnectivity initially,but the trend has turned around after 2000.

Olympia and Washington do not follow the same trend in the disconnectivity of their street network constructions. The SNDi in Olympia peaked in 1976-1990, while the SNDi of street constructions in Washington peaked in 1991-2000.

How do development practices in Olympia fare in comparison to others in Washington? Most recently in 2001-2014, street construction in Olympia was the 6th-most disconnected out of the 6 cities in Washington. Its position in the ranks since 1975 has fallen; relative to other cities in Washington, street construction in Olympia has become more connected. Olympia ranked 1st in 1975, 2nd in 1976-1990, 3rd in 1991-2000 and 6th in 2001-2014.

Olympia and United States do not follow the same trend in the disconnectivity of their street network constructions. The SNDi in Olympia peaked in 1976-1990, while the SNDi of street constructions in United States peaked in 1991-2000.

How do development practices in Olympia fare in comparison to others in United States? Most recently in 2001-2014, street construction in Olympia was the 244th-most disconnected out of the 315 cities in United States. Its position in the ranks since 1975 has fallen; relative to other cities in United States, street construction in Olympia has become more connected. Olympia ranked 35th in 1975, 41st in 1976-1990, 124th in 1991-2000 and 244th in 2001-2014.

Olympia and Washington do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in Olympia peaked in 1991-2000, while the SNDi of street constructions in Washington rose steadily.

To date, Olympia is the 1st-most disconnected out of the 6 cities in Washington. Its position in the ranks since 1975 has not changed. Olympia ranked 1st in 1975, 1st in 1976-1990, 1st in 1991-2000 and 1st in 2001-2014.

Olympia and United States do not follow the same trend in the disconnectivity of their aggregate street networks. The SNDi in Olympia peaked in 1991-2000, while the SNDi of street constructions in United States rose steadily.

To date, Olympia is the 39th-most disconnected out of the 315 cities in United States. Its position in the ranks since 1975 has fallen; relative to other cities in United States, the street network in Olympia has become more connected. Olympia ranked 35th in 1975, 32nd in 1976-1990, 35th in 1991-2000 and 39th in 2001-2014.

As of 2015, Olympia had a built-up area of 49.97 square kilometers, and a population of 97711 people.

These are some other cities with approximately the same population: