Bi-State Program, Section 3.3.5 GIS and Map of Historical and Existing Habitat. Historic Habitats of the Columbia River.

Graves, J.K., J.A. Christy, and P.J. Clinton. 1995. Historic habitats of the lower Columbia River. Columbia River Estuary Study Taskforce, Astoria, OR. 11 pp. + appendices.

GIS data is also available here