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Signifi'cant environmental and social paramete,rs ,Endangered and th reatened species <:ultural resources Aesthetics Sod oeconami cs No action No impact. N-o impact. No impact. Continuing lack of a stable water supply for stabilizing the agriculturally oriented economy. Table S-1 --Comparative environmental and social impacts of ~lternatives Modified selected plan 1984 No impact to the peregrine falcon, black-footed ferret, or ,bald eagle. Jeopardy bi-ological opinion was orig"i- nally Issued on the ,wbooping crane. II study of land andl or flow management options has been in it i ated to resolve the .jeopardy finding. ~o known -National -Register properties would be directly affected by tbe project. Further archeological i,nves- ti-gations would -be 'required. Selected plan 1976 ~o anticipated impact to tbe peregrine falcon, black- footed ferret, ~nd bald eagle. Colorado DOW bas listed tberes Ident wbite pelican .population and greater sandhill crane as endangered. No impact on these two state-listed species is foreseen. Ko -known Hationa-l Register properties would be chrectly affected by tbe project. Further arCheological inves- tig~tions would be required. 'Further ,ground- water development No ant ki pated impact to tbepere- grtne falcon or black-footed ferret. Reduced ri ver water flow may reduce bald eagle feeding babitat. None. Change from a rlverine system Change from a riveri-ne system No impact. int-o a lacustrine env:ir-Onment. into a lacustrine environment. Development of a stable water supply with less population displacement and land loss associ'ated -wi th .water impoundment. Development of a stable wate,r supply, but with consi~erable population displacement and . land loss associated with water impoundment. Continuing lack of a consistent water supply, but not of tbe magnitude of the "No actionll plan. Weld County reservoi,r development No known impaets to any federally listed species; however, an adverse impact is foreseen on the res i'dent 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. Change from a riverine system into a lacustrine env ironment. Development of a stable water supply, but with more adverse environmental con- sequences than both the 1976 and 1984 pI ans.