The Spans of North America explores the structural and aesthetic qualities of bridges across the continent, emphasizing their architectural forms and the interplay between engineering and landscape. The photographs capture the diverse designs and materials of North American bridges, highlighting the contrast between urban and rural environments.

Bridges employs a methodical visual approach, focusing on composition, light, and texture to reveal both the monumental scale and intricate details of each span. The work reflects on themes of connectivity and passage, evoking a mood of contemplation about the role of these structures in shaping human movement and geographic experience. The book contains 328 pages of extensive photographic documentation published in 2001 under the title The Spans of North America.