Eugene in context: Street-network sprawl trends

Eugene in context

33.64.24.8<19751976–19901991–20052006–2020SNDi of street additions
33.64.24.8<19751976–19901991–20052006–2020SNDi of entire street network
EugeneOregon (Region)United States (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Eugene plotted against Oregon and United States. The SNDi of new construction in Eugene peaked in 1976-1990, compared to Oregon which peaked in 1976-1990 and United States which peaked in 1991-2005. Most recently, Eugene's incremental SNDi fell from 4.46 to 4.21 between 1991-2005 and 2006-2020. In terms of the aggregate network, Eugene ranked 3rd out of 4 cities in Oregon and 207th out of 333 in United States as of 2020.

New Street Additions (2006–2020)

SNDi value
4.21
Rank in United States
181st of 333
Rank in Oregon
3rd of 4

Entire Network (Aggregate)

SNDi value
3.56
Rank in United States
207th of 333
Rank in Oregon
3rd of 4

Rankings go from most connected to most disconnected — rank 1 is the most connected.

What about similarly populated cities?

2.83.54.24.9<19751976–19901991–20052006–2020SNDi of street additions
2.83.54.24.9<19751976–19901991–20052006–2020SNDi of entire street network
EugeneKharianSanta Ana

In new street additions, Eugene built increasingly disconnected streets from 1975 through 1976-1990, then improved, while Kharian fluctuated in its street-construction patterns and Santa Ana fluctuated in its street-construction patterns. For the full network, Eugene and Santa Ana both became progressively more disconnected, while Kharian fluctuated in connectivity. Notably, Eugene had a more sprawly network than Santa Ana in 1975 but the two have since reversed their relative ranking.