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CHAPTER 3: EXISTING CONDITIONS IN THE STUDY AREA 4A crosses the CMZ and 100-year floodplain alternative are listed in Table 3-7.Additionally, of the Cie Elum River near the south end of sensitive areas such as breeding buffers occur Cle Elum Lake. Alternative 4A crosses the Cie for northern spotted owl within the study Elum River 100-year floodplain near its eastern areas for Alternatives 1 through 4a. terminus. Alternative 5 is within the Yakima River floodplain and CMZ near Cie Elum. Critical Habitat Alternatives 1 through 3 cross the Yakima River, 3.4.4 Environmental Species which is critical habitat for steelhead and bull Act (ESA) Listed Species and trout(Appendix B, Map 4A).Alternative 4A Critical Habitat passes through northern spotted owl critical The endangered and threatened species and habitat and terminates near the Cie Elum critical habitats criteria assess the alternatives River (Appendix B, Map 4C). Alternative 4B also for impacts to ESA listed species and critical passes through northern spotted owl critical habitats that may be impacted by the habitat and terminates near the Cie Elum River proposed alternatives. The potential presence (Appendix B, Map 4C). Alternative 5 adds new of ESA listed species and designated critical crossings over the Yakima River but does not habitat adjacent to each alternative is shown in pass through northern spotted owl critical Table 3-7. habitat. All alternatives,with the exception of 3.4.5 Historical Sites, Parks, Alternative 6 (no build alternative), may and Recreational Facilities affect bull trout and steelhead because there would likely be in-water work associated with Figure 3-3 provides the general location for historical sites, as well as parks and construction in rivers and streams that support recreational facilities.These resources are these species.Alternatives 4a and 5 would Listed below. In addition to the following likely have the greatest potential for long term resources, a more in-depth analysis was impacts to bull trout and steelhead because these alternatives require new bridge crossings performed which explores the geologic, historic, cultural, and ethnographic setting over the Cie Elum River and Yakima River, respectively.Alternatives 1 through 3 provide in the study area.This report is included in Appendix C. the greatest potential for improving water crossings which could have long term beneficial Cultural Sites effects for these species. A preliminary review of the Department of Construction noise may affect terrestrial Archaeology and Historic Preservation's (DAHP) species associated with these Alternatives; resources database revealed at least 60 however,this cannot be analyzed until an previously recorded archaeological resources action area is defined and field surveys occur within 0.5 miles of the 15.5-mile segment to assess potential habitat for ESA listed of 1-90. in addition, the DAHP's statewide species during future assessments. predictive model indicates that the majority of the highway segment under study lies within Species an area with a very high risk of containing Species that are potentially present within or archaeological features and/or materials. adjacent to the proposed alignment of each VOLUME I: FEASIBILITY REPORT 1-90 Corridor Easton to Cle Elum Feasibility Study 1 45