The protection of water quality and the maintenance of productive
anadromous fisheries is a primary concern in the Pacific Northwest.
Excessive suspended sediment loads is a principle water
quality problem on small wildland watersheds in this region (Anderson,
1971; Brown, 1972). Man's activities have been shown to increase
sedimentation rates...
Slow moving earthflows (0.1 15 m/yr.) may constrict valley
floors and directly impinge on stream channels. Earthflows that
move laterally into channels deliver organic and inorganic material
to the stream from the earthflow toe. If the amount and particle
size of this material is too large to be removed by...
Classification of Streams and stream habitats is useful for research involving establishment of monitoring stations, determining local impacts of land use practices, generalization from site-specific data, and assessment of basin-wide, cumulative impacts of human activities on streams and their biota. This thesis presents a framework for a hierarchical classification system,...
This study examined the occurrence of coarse woody debris (i.e., pieces greater than 0.15 m in diameter and 2.0 m in length) in first- through fifth-order streams located within the Drift Creek Basin of the Oregon Coast
Range. Nine "tributary reaches" were surveyed to determine how three land management treatments...
This study investigates patterns of physical structure organization in stream
networks. In particular, it seeks to describe patterns of wood, boulders, pools and slope
that are evident in stream channels and to determine whether patterns of these elements
are influenced by network-level controls. The four in-stream parameters were
combined to...
Riparian vegetation (trees > 10 cm dbh), woody debris (> 10 cm diam, > 1 m long), channel, and landform characteristics were inventoried in mature (80-150 yrs) and old-growth riparian areas (>250 yrs) selected from small tributaries of the Coos and Coquille River basins in southwestern Oregon. Basal area of...
The Upper Sprague River Watershed (North and South Forks of the Sprague River) in south central Oregon provides important habitat for
salmonid species, including native bull trout (Salvelinus confluentus) and redband trout (Oncorhynchus mykiss ssp.). Concern over the loss of viable habitat for these species has increased due to reductions...
The importance of active-entry drift at a community-scale
was evaluated by testing whether the placement of wood
in streams affected the abundance of Baetis spp. mayflies in
drift. Baetis were chosen because they use drift as a
behavioral strategy and are important in salmonid diets. The
density of woody debris...