The rapid population growth and related economic
growth of the Willamette Valley has resulted in a significant
reduction in air quality over the past several decades.
Within the Willamette Valley air ventilation is very poor and
therefore the airpo1lutton potential is one of the highest
in the United States. There...
A Willamette Valley farm cooperative was interested
in evaluating locations for their canning facilities based on
the criterion of minimizing aggregate distance to their contract
farms. This location problem presented an excellent opportunity
for a geographic application project as it was characterized by
one, a spatial distribution of farms and...
This study was conducted to explore differences in diversity and abundance of small
mammal populations in natural and restored wet prairies in Oregon's Willamette Valley.
Mammals were live-trapped in eight Willamette Valley wet prairies (four natural remnants and
four restorations) during the summer of 2000; population abundance estimates for each...
GIS technology has reached a point where it can be utilized by nonprofessionals in a desktop environment. This paper reviews the implementation of a pilot project for developing a localized-natural resource GIS. The resulting GIS was custom designed to answer questions posed by fish and wildlife biologists who need to...
Physical, chemical and bacterial water quality parameters of
the upper Wallowa River were sampled periodically between July 2,
1978 and June 9, 1979 at nine stream and lake sampling sites. Water
upstream from Wallowa Lake was typified by low nutrient concentrations
( generally below detectable limits except for nitrates), low....
Elk River is a sixth order stream, draining a 200 square
kilometer basin in the Klainath Mountain province of
southwestern Oregon. Timber harvesting began in the basin
during the 1950's, with peak removal of wood occurring in the
mid to late 1960's. This activity lead to an increase in the...
This study investigates riparian cover change between 1939 and 1996 utilizing aerial
photography, bank conditions and stream gauge data. Three sites under 1.0 km2, along a 10-
km reach north of Harrisburg, Oregon, were evaluated. The cover classification scheme
included 18 classes composed of 3 canopy densities and 8 structural...
The ocean wave conditions at the mouth of the Columbia River have
long proven a hazard to ship navigation. Over 62 major shipwrecks
have occurred at, or in the vicinity of the river entrance. The wave
pattern is extremely complex, varying seasonally with prevailing winds
and river discharge, as well...
Throughout the 20th century, windthrow has affected forests in the Bull Run watershed, a 26,500 ha basin that is the principal water source for the city of Portland, Oregon. Windthrow from storms in 1973 and 1983 was mapped into a geographic information system (GIS) and compared to a 1931 windthrow...
Featuring high waterfalls and forested cliffs, and displaying a remarkable transition between the Pacific and Interior west, the Columbia River Gorge reveals the grandeur of western landscapes. Yet the landscape that one sees today is an amalgamation of the Gorge's natural setting and its unique human history. Historical research on...