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Biological Resources <br />Designated critical habitat for upper Willamette River steelhead trout is identified in the <br />Willamette and McKenzie rivers within the project vicinity (Federal Register 2000). Steelhead <br />trout belonging to the upper Willamette River evolutionarily significant unit (ESU) use all <br />accessible river reaches in the Willamette River upstream of Willamette Falls, which <br />encompasses the project area. Designated critical habitat for upper Willamette River Chinook <br />salmon is also identified in the Willamette and McKenzie rivers within the project vicinity <br />(Federal Register 2000). Chinook salmon in the upper Willamette River evolutionarily <br />significant unit consist of wild spring-run fish that mainly use the Clackamas River basin <br />(Federal Register 1999). This Chinook salmon evolutionarily significant unit does not include <br />hatchery stocks or fall-run fish. <br />Bull trout in the lower Columbia River distinct population segment are divided into 20 <br />subpopulations within nine major tributaries (Federal Register 1998). Three subpopulations of <br />bull trout are identified in the Willamette River basin within the project vicinity, excluding the <br />middle fork Willamette River where they are thought to be extirpated. Oregon chub, which is <br />endemic to the Willamette River drainage basin, is divided into 24 subpopulations that are <br />located in the Santiam River subbasin, the main stem Willamette River subbasin, the middle fork <br />Willamette River subbasin, and the coast fork Willamette River subbasin (LTSFWS 1998). There <br />are no subpopulations of Oregon chub within the main stem Willamette River subbasin <br />downstream of the project area, and no suitable habitat exists in the main stem Willamette River <br />near the alternative project sites (USFWS 1998). <br />The Oregon spotted frog is a medium-sized frog that prefers to stay near water year-round when <br />not hibernating. These frogs live in floodplain wetlands associated with permanent water bodies <br />and prefer the warm, shallow edges of marshes to lay their eggs. The Alternative 1. site borders a <br />slough, which may provide some medium-quality frog habitat. <br />Although no in-water construction activities are planned under any of the alternatives, there is <br />the potential for impacts on aquatic life resulting from sedimentation generated on construction <br />sites and pollutant spills entering the rivers and degrading water quality. Impacts on f sh, frogs, <br />~`: ' and other aquatic organisms could be avoided by maintaining a spill control plan and <br />implementing best management practices for stormwater runoff during construction. <br />Bradshaw's lomatium is a perennial herb occurring mostly in and around the Eugene/Springfield <br />metropolitan area. Most occurrences are in fairly high-quality native wetland prairies, although a <br />few large populations are found in areas with substantial grazing history. The Willamette daisy <br />is a perennial herb also occurring in native wetland prairies. The species is geographically <br />limited to the Willamette Valley and has currently been identified at 281ocations. Kincaid's <br />lupine is a long-lived perennial herb. It occupies 48 sites throughout the Willamette Valley, and <br />its distribution implies a close association with native upland prairies. Because no native <br />wetland prairie or native upland prairie communities occur on any of the alternative sites, <br />construction of the proposed courthouse is not expected to affect any of the listed plants or their <br />habitats. <br />New Federal Courthouse 57 Final EIS <br />