For over 40 years, the Columbia River Estuary Study Taskforce (CREST) has been working with citizens, organizations and agencies along the Columbia River Estuary and the Oregon and Washington Coasts. Our mission is bridging community and ecology on the Co

The Columbia River Estuary is situated on the Oregon–Washington border and the Pacific Coast of the United States. It was traditionally inhabited by the Chinook Native Americans and discovered by settlers in 1788. The Estuary plays host to a plethora of species of marine and terrestrial flora and fauna, and multiple conservation organisations exist that maintain the area.

It has been 30 years since the lower Columbia River was designated an “estuary of national significance” and roughly the same since NOAA’s Pacific Ocean transect monitoring and indicators system was established. After so much investment in recovering the lower Columbia River and nearshore ocean ecosystem, CREC provides the opportunity to ...

The CR Estuary – A Conceptual View: • A river estuary is defined by – – Salinity intrusion (~10-60 km in CR) – Tides (>200 km, to Bonneville) – Coastal mixing zone (the CR inner plume) – Adjacent wetlands and floodplain (including historical) • The main components are: – The tidal-fluvial zone (Bonneville to limit of salinity ...

managing and protecting the lower Columbia River and estuary. It is a guide for preserving and enhancing water quality and habitat, to be implemented by federal, state, local, and tribal governments; river users; environmental interests; and citizens of the region. As part of the National Estuary Program, the Management Plan focuses on the 146 ...

The estuary at the mouth of the Columbia River, located near Astoria, OR, is also a very productive mixing zone between river and ocean processes – physical, chemical and biological. In the estuary, factors such as pollution from upstream urban areas, diversion of wetlands and streams, and increases of predatory populations continue to ...

Columbia River Estuary Study Taskforce 818 Commercial Street, Suite 203 Astoria, Oregon 97103 503-325-0435 Fax 503-325-0459. Site Directory. About > > Services > CREST Projects > > > > > Partnerships > > Contact ...

The Columbia River estuary exports high rates of nutrients into the Pacific, [207] except for nitrogen, which is delivered into the estuary by ocean upwelling sources. [208] Watershed. Near The Gorge Amphitheatre in George, Washington. Most of the Columbia's drainage basin ...

We illustrate the classification by applying it to the Columbia River estuary (Oregon-Washington, USA), a system that extends about 233 river kilometers (rkm) inland from the Pacific Ocean. More than three-quarters of this length is tidal freshwater. …

1990年1月1日 · The Columbia River Estuary (Fig.2) occupies a drowned river valley incised into volcanic and sedimentary bedrock of Tertiary age and has probably evolved in a manner similar to Alsea Bay, as described by PE'r~soN, SCHEmEGGER and SCHRODER (1984). The valley has been partially filled by Pleistocene and Holocene sediments derived from the Columbia ...