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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

Fisheries Research Institute, of the University of Washington's College of Ocean and Fishery Sciences, was responsible for the Epibenthic Organisms Work Unit research under the original CREDDP* contract to the prime contractor, Dames and Moore of Seattle, Washington. Pursuant w ith the continuation of CREDDP in 1982, in November FRI was directly contracted to complete the Epibenthic Organisms Work Unit research and provide summary and interpretation of those results.

The Columbia River Estuary Study Taskforce contracted with the Oregon Department of Fish and Wildlife to prepare an interpretive report on the fish community of the Columbia River Estuary. Most of the data contained in this report were collected for the Columbia River Estuary Data Development Program (CREDDP) by the National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration during an estuarine finfish survey, February 1980 - July 1981. A description of all NMFS data collected and summarized for CREDDP is contained in Appendix A. A discussion of NMFS survey and

The Columbia River Estuary Data Development Program (CREDDP), a federally-funded research program, began in 1978 and was completed in 1984. The purpose of the program was to provide a foundation of scientific knowledge about the estuary and to provide information useful in managing land and water resources through the public planning and permitting processes. This Guide was prepared for people who need to understand the effects on the estuary of proposed development projects, but who do not necessarily have special training in estuarine science. The Guide explains the principles on which

The research reported in the following two volumes was funded primarily by CREDDP in two parts. The first part of the study employed the U. S. Army Corps of Engineers Waterways Experiment Station Implicit Flooding Model (WIFM). Thanks are due to Lee Butler of WES for supplying the original code for WIFM. The second part of the study, which was performed after CREDDP restarted in 1982, consisted of the modification of a depth-dependent channel model and its application to the estuary. This second study would not have been carried as far as it has without additional support from the Portland