Urban Density in Portland (USA). The experience of the Urban Growth Boundary.

Abstract

This study explores the Urban Growth Boundary (UGB) in Portland, Oregon, implemented in 1979 as a strategy to control urban sprawl and protect natural resources. While the UGB successfully restricted expansion and preserved rural lands, it has faced challenges in fostering higher-density development within its limits. Portland’s metropolitan area still comprises predominantly lowdensity, single-family homes, which strains public services and increases car dependency. The paper examines four urban development projects, offering insights into Portland's efforts to boost urban density. Findings highlight a complex balance between policy goals, private sector involvement, and cultural factors favouring suburban lifestyles. Although the case study projects promote density, car dependency and infrastructure limitations persist as significant obstacles. To sustain higher-density living, Portland must further refine its policies and enhance public-private collaboration.