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This document is one of a set of publications and other materials produced by the Columbia River Estuary Data Development Program (CREDDP). CREDDP has two purposes: to increase understanding of the ecology of the Columbia River Estuary and to provide information useful in making land and water use decisions. The program was initiated by local governments and citizens who saw a need for a better information base for use in managing natural resources and in planning for development. In response to these concerns, the Governors of the states of Oregon and Washington requested in 1974 that the

The purpose of the Avifauna work unit within the Columbia River Estuary Data Development Program (CREDDP) was to determine the role of birds within the Columbia River Estuary. The study was divided into several phases to meet this objective. Initially, a literature review of previous avian research was conducted (Jones & Stokes Associates 1 980). Three initial study objectives were designated (Pacific Northwest River Basins Commission [PNRBC] 1979): (1) identify "key" avian species and the habitats important to them, (2) identify key avian habitats and describe their avian species composition

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

This report provides information on the benthic infauna of the Columbia River Estuary collected as part of the Columbia River Estuary Data Development Program (CREDDP). The studies were conducted by the Benthic Infauna Work Unit, Robert L. Holton, Principal Investigator, of the College of Oceanography, Oregon State University. In addition to funding provided through CREDDP, support was provided by the U.S. Army Corps of Engineers Portland District and by the College Work Study Program, which helped support part-time student aides. Sediment analyses were conducted by the Corps of Engineers

Research presented in this report was initiated in September 1979, and continued until 30 September 1981, when the PNRBC was abolished by the federal government. During this period the Benthic Primary Production work Unit of CREDDP designed a sampling program compatible with the contract work tasks, developed field methods and procedures, conducted research at intensive study sites, and initiated sampling at a series of validation and survey sites. After the program resumed again under the administration of CREST in November 1982, the principal activities of the work unit included data

This study compares information on the Columbia River Estuary from a time predating most human impacts with corresponding information derived from recent sources. Section 2, Methods and Materials, describes the selection and use of materials to achieve this comparison. Surveys conducted from 1868 to 1873 are the source of the historical materials selected. These materials permitted the mapping and measuring (in acres) of five estuarine "habitat types": deep water, medium depth water, shallows and flats, marshes, and swamps. Also, the areas removed from the estuarine system since the 1868-73

This report summarizes results from a four-year study of the physical oceanography of the Columbia River Estuary. Work was carried out in six areas: theory of estuarine circulation, tidal processes, system energetics, salinity distribution, salt transport, and low-frequency flow processes. The research reported here was funded primarily by the Columbia River Estuary Data Development Program (CREDDP). Particular thanks are due to Jim Good, Dr. Jack Damron, David Fox, all past or present CREST/CREDDP staff, and Ann Saar, citizen volunteer, all of whom worked to obtain the funds for completion of

This report is the result of a collaborative effort by five CREDDP principal investigator/researchers and CREDDP's staff science/management coordinator. The five (Simenstad, Jay, McIntire, Sherwood, and Small) contracted with CREDDP in late 1982 to carry out the Integration work unit, described in CREDDP's Revised Plan of Study (1982) as follows: The purpose of the Integration work unit is to synthesize the results of the various biological and physical work units and to produce a report describing the structural and functional attributes of the estuarine ecosystem. Satisfactory integration is

A major goal of this report is to provide an integrated presentation of Columbia River Estuary community dynamics in relation to physical processes. This chapter presents the conceptual model used in carrying out physical-biological integration. Problems in integrating CREDDP data and considerations in model selection are described (Section 6.1). The modeling approach (Section 6.2) and details of the model itself (Section 6.3) are then presented. The model is discussed according to major biological processes: Primary Food Processes (Primary Production and Detrital Decomposition) and