The main objective of this program is to determine the number of spring chinook annually caught by the sport fishery from the Willamette River below Oregon City and from Multnomah Channel. This information, when combined with the Clackamas River catch and calculated Willamette Falls and Clackamas River escapements, provides an...
The Slices Framework is intended for use in making decisions about conservation and restoration in the Willamette River floodplain. It makes use of distinct spatial units for tracking change in the floodplain. The first of these units are 1 kilometer long slices drawn at right angles to the floodplain, first...
The Slices Framework is intended for use in making decisions about conservation and restoration in the Willamette River floodplain. It makes use of distinct spatial units for tracking change in the floodplain. The first of these units are 1 kilometer long slices drawn at right angles to the floodplain, first...
The Slices Framework is intended for use in making decisions about conservation and restoration in the Willamette River floodplain. It makes use of distinct spatial units for tracking change in the floodplain. The first of these units are 1 kilometer long slices drawn at right angles to the floodplain, first...
The SLICES framework is intended for use in making decisions about conservation and restoration in the Willamette River floodplain. It makes use of distinct spatial units, called slices, for planning and tracking change in the floodplain. The Conservation 2050 – Channel Complexity and Floodplain Forest Technical Report describes the source...
The SLICES framework is intended for use in making decisions about conservation and restoration in the Willamette River floodplain. It makes use of distinct spatial units, called slices, for planning and tracking change in the floodplain. The Fish Communities ca. 2010 Technical Report describes the two associated attributes (field names:...
The SLICES framework is intended for use in making decisions about conservation and restoration in the Willamette River floodplain. It makes use of distinct spatial units, called slices, for planning and tracking change in the floodplain. The Juvenile Spring Chinook Habitat ca. 2010 Technical Report describes the two associated attributes...
The SLICES framework is intended for use in making decisions about conservation and restoration in the Willamette River floodplain. It makes use of distinct spatial units, called slices, for planning and tracking change in the floodplain. The Two-year Flood Inundation Technical Report identifies the source of the data and explains...
The SLICES framework is intended for use in making decisions about conservation and restoration in the Willamette River floodplain. It makes use of distinct spatial units, called slices, for planning and tracking change in the floodplain. The Channel Complexity ca. 2010 Technical Report explains the components used in quantifying channel...
The SLICES framework is intended for use in making decisions about conservation and restoration in the Willamette River floodplain. It makes use of distinct spatial units, called slices, for planning and tracking change in the floodplain. The Floodplain Forest ca. 2010 Technical Report identifies data sources, describes the data processing,...
The SLICES framework is intended for use in making decisions about conservation and restoration in the Willamette River floodplain. It makes use of distinct spatial units, called slices, for planning and tracking change in the floodplain. The Percent Bank Forested ca. 2010 Technical Report identifies data sources, describes the data...
This document provides an updated perspective on the distribution of the species in the Willamette River Basin, based on new field surveys, literature review, and contacts with other biologists and landowners. It also presents recommendations for additional monitoring and research.
The lower Willamette River, located between river mile 4.0
and 26.5, is the most seriously polluted section of the Willamette
River Basin.
Low dissolved oxygen concentrations of 2.0 to 3.0 mg/1 are
observed annually in this section of the river due to the pollutional
loads discharged into it. Waste discharges...
The people of Oregon have become increasingly aware of the constant devaluation of the public waters by unrestricted stream pollution. All of the many uses of natural water have been affected to some degree by the utilization of these same waters as carriers of domestic and industrial wastes. The streams...
Discusses appropriations for engineering projects in Yaquina Bay, the Willamette River and the Yamhill River. Money was appropriated for continuing improvement of the Yaquina Bay jetties, for a "snag boat" and to build dikes on the Willamette River, and for a lock and dam on the Yamhill River.
As Europeans settled the Willamette Valley in the 1800s, they began to simplify Oregon's largest river contained wholly within state boarders—the Willamette. The river lost miles of channels from dikes, dams, and development. Some channels vanished under concrete. Others became meander scars, or shallow, dry depression in the land where...
Channel evolution and influences of changing floodplain characteristics, heterogenous bank materials, and altered flow regimes were examined along the Willamette River, a large alluvial river in northwestern Oregon. The Willamette River is composed of a series of geomorphically diverse reaches, which have each evolved uniquely in the century following Euro-American...
In this study the impact of episodic events on levels of bioavailable trace metals Zn,
Cu, Cr, Cd, Pb, and As (III) were determined for the lower Willamette River in Oregon.
In addition, a comparison among three alternative methods for estuary sampling was
conducted. Potential adverse human health risk associated...
Time trends in flow and channel characteristics were evaluated for the Middle Fork Willamette (MFW) River, which drains a 668 km2 forested watershed in the Cascade Mountains of western Oregon. Timber
production is the primary land use in the watershed. Analysis of precipitation and peak flow data from 1959 to...
An investigation of the fishes of the Willamette River and three of its larger tributaries was made during July, August, September, and November of 1951, to ascertain the possibility of using them as bio-indices of pollution. Thirteen stations were established on the Willamette River and tributaries. These stations were selected...
Off-channel features such as alcoves and side channels can have important ecological functions for large rivers such as the Willamette River. Some species and age classes of fish may select these features instead of the main channel to feed, avoid predation by other fish, escape fast water, or seek out...