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Significant environmental and social parameters Endangered and threatened species Cultural resources Ko action No impact. No impact. Table S-1 --Comparative environmental and social impacts of alternatives Modified selected plan 1984 No impact to the peregrine falcon, black-footed ferret, or bald eagle. Jeopardy biological opinion was origi- nally issued on the whooping crane. A study of land andl or flow management options has been. initiated to resolve_ the jeopardy finding. No known National Register properties would be directly affected by the project. Further archeological tnves- tig'ations would be required-. Selected plan 1976 No antici_pated impact to the peregrine falcon, black- footed ferret, and ba., d eagle. Colorado DOW has listed the resident white pelican population and greater sandhill crane as endangered. No impact on these two state-listed species is foreseen. No known National Re~ister properties would be lrectly affected by the. project. Further ~rcheolo9ical inves- tigations would be required. Further ground- water development No anticlpated impact to the pere- grine falcon or black-footed ferret. Reduced river water flow may reduce bald e~le feeding habitat. None. Co.:> o .... 00 Weld County reservoir devel~pment No known impacts to any federally listed species; however, an adverse impact is fore~een on the resident white pelican colony at Riverside Reservoir. No archeological or histor- ical surveys were undertaken in 1976 due to engineering and economic evaluations showing Narrows to be the selected plan. Aesthetics No impact. . Change from a riverine system Change from a riverine system No impact. into a lacustrine environment. into a lacustrine environment. Change from a riverine system into a lacustrine environment. Soci.oeconomics Continuin9. lack of a stable water supply for stabilizing the ~rjculturally oriented economy. Development of a stable water supply with less population displacement and. land loss associated with water impoundment. Development of a stable. water supply, but with considerable population displacement and land, loss. associated with water impoundment. Continuing lack of a consistent water supply. but not of the magnitude of the "No action" plan. Development of a stable water supply, but with more ad~erse environmental con- sequences than both the 1976 and 1984 pI ans.