Columbia Estuary Data Development Program - Bathymetric Atlas of the Columbia River Estuary

This atlas is a collection of maps from several hydrographic studies undertaken by Northwest Cartography, Inc. between 1979 and 1982 for the Columbia River Estuary Data Development Program (CREDDP), the U.S. Army Corps of Engineers Portland District, and the Corps' Waterways Experiment Station (WES). It also includes maps from surveys undertaken around three other historical time periods (1868, 1935, and 1958) by the U.S. Coast and Geodetic Survey (now the National Ocean Survey, a division of the National Ocenaographic and Atmospheric Administration). The purpose of the atlas is to provide an overview of sediment accretion and erosion patterns within the estuary and to facilitate interpretation of the slow, large-scale changes in the estuary floor.