The Tualatin Basin landscape has undergone extensive change since the initiation of Euro-American settlement, with important consequences for basin hydrology and water quality. Changes that include the isolation of the Tualatin River from its floodplain areas, losses of important wetlands and riparian areas, and urbanization associated with population growth in...
Invasion by exotic species can pose a major challenge for developing native
plant communities in wetland restoration projects. Often native plant communities
do not develop as anticipated in restored wetlands due to colonization by exotic
species that dominate the native plant community. Despite the time and expense to
restore wetlands,...
This project, commissioned in 1998, is part of the MidCoast Watersheds Council's efforts to better understand the status and condition of the area's natural resources and to work with interested landowners to enhance and protect important areas.
The Seventh Annual James A. Vomocil Water Quality Conference was planned after three topics had been selected as being of particular interest. Wetlands, Best Management Practices, and Riparian Zone Effectiveness were the topics. Speakers were invited who by virtue of their training, their experience, or their work assignment had insights...
This paper will address Oregon's ability to regulate and manage its wetland resources as a means for protecting and enhancing salmon habitat. After identifying the importance of wetland environments the paper will look into OWRF to assess its effectiveness. Ultimately the paper will conclude that OWRF's design is an effective...
The U.S. Fish and Wildlife Service's National Wetlands Inventory (NWI) was developed to map U.S. wetlands comprehensively, following the Cowardin classification system. Wetlands are mapped by the NWI using small scale aerial photographs, but the inventory is not field checked in detail. The accuracy of this inventory has been questioned....
Permit specifications, construction plans, and field measurements were used to examine the correlation between design and conditions "as-built" in a population of 11 palustrine emergent marshes created in the metropolitan area of Portland, Oregon, between 1980-1986. The projects ranged from six months to almost seven years in age. Data on...
As part of its management strategies for wetlands in Oregon, the Division of State Lands sponsored a Local Wetland Inventory for the city of Tillamook. Wetlands delineation,
determination, assessment, and management are the concern of several institutions which worked together to create the 1993 Oregon Freshwater Wetland Assessment Methodology. With...
This paper presents the results of field tests of the Oregon Freshwater Wetland
Assessment Methodology. It begins with a review of the history of wetland assessment
techniques, including an in-depth review of some more popular methods. State and
federal wetlands legislation are briefly discussed and the utility of regional wetland...
This report is divided into several sections. The first provides information
on the current status of wetlands, the Corps' regulatory role, its statutory
enforcement authority, and its interpretation of that authority. The next
section describes the Portland District's enforcement structure and procedures.
A case study detailing the District's treatment of...