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Value Assessments. Prepared for the City of Portland Bureau of Environmental Services

By Adolfson Associates and Inc Wildlife Assessments


Adolfson Associates conducted field surveys in the spring and summer of 2000 and describe the results for 36 wetlands in four target areas of the Johnson Creek floodplain: Tideman/Johnson, Errol Heights, Lents, and Lower Powell Butte. These wetlands occur on public and private parcels designated by BES as priorities for the Johnson Creek Predesign Project. Information is provided for sub-areas (groups of wetlands) and includes: wetland delineation data sheets; a description of vegetation, soils, and hydrology; a wetland functional value assessment; a wildlife habitat assessment (WHA); a list of observed wildlife species; a basic site map; and recommendations for restoration. Figures illustrating key features are provided for selected wetlands. Unique wetlands identified during the inventory include Oregon ash forested wetlands and obligate-dominated emergent wetlands in the Lower Powell Butte area; open water aquatic systems in the Lents, Errol Heights, and Tideman/Johnson target areas; and wetlands in the Brownwood/Alsop, Circle Avenue, and Zenger Farm sub-areas that contain dense breeding populations of red-legged frogs and other amphibians. Adolfson Associates, Inc. 2001. Crystal Springs Creek Fish and Wildlife Habitat Assessment. Prepared for the City of Portland. Using data from field surveys of instream, riparian, and upland habitat conducted along Crystal Springs Creek (CSC), a spring-fed tributary to Johnson Creek, Adolfson devised an assessment matrix for evaluating a wide range of prototypical fish habitat restoration projects for seven creek segments or “reaches. ” Results of the analysis indicate that no single project or reach is essential for restoring anadromous fish habitat in the CSC basin, but that a suite of projects would be beneficial. Adolfson also created an analytical tool for assessing the costs and benefits of acquiring private property in the CSC basin for the purpose of conserving or enhancing anadromous fish habitat. Results indicate that the highest priority property acquisitions shoul

Year: 2011
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