. ▁ ▁After ▁the ▁dam ming , ▁the ▁water ▁during ▁high ▁flo ods ▁began ▁to ▁cover ▁much ▁of ▁the ▁valley ' s ▁a rable ▁land ▁- ▁and ▁when ▁it ▁was ▁drawn ▁down ▁to ▁produce ▁power ▁it ▁carried ▁away ▁fert ile ▁soil , ▁leaving ▁agricult ural ▁land ▁useless . ▁Additionally , ▁it ▁is ▁estimated ▁that ▁the ▁habitat ▁of ▁ 8 , 0 0 0 ▁de er , ▁ 6 0 0 ▁el k , ▁ 1 , 5 0 0 ▁mo ose , ▁ 2 , 0 0 0 ▁black ▁be ars , ▁ 7 0 , 0 0 0 ▁du cks ▁and ▁ge ese ▁was ▁flo oded ▁due ▁to ▁the ▁creation ▁of ▁the ▁res er voir s . ▁ ▁The ▁introduction ▁of ▁a ▁dam ▁affect s ▁every ▁living ▁thing ▁in ▁the ▁surrounding ▁area , ▁both ▁up ▁and ▁down stream . ▁Up stream ▁change ▁is ▁obvious ▁as ▁water ▁levels ▁rise ▁and ▁sub merge ▁nest ing ▁grounds ▁and ▁migration ▁routes ▁for ▁water ▁f ow l . ▁As ▁water ▁levels ▁in ▁storage ▁res er voir s ▁change ▁throughout ▁the ▁year , ▁aqu atic ▁habitat ▁and ▁food ▁source ▁avail ability ▁become ▁un re li able . ▁Pl ank ton , ▁a ▁main ▁st ap le ▁of ▁sal mon ▁and ▁tr out ' s ▁di et , ▁is ▁especially ▁sensitive ▁to ▁changes ▁in ▁water ▁level . ▁N ut ri ent ▁rich ▁sed iment , ▁that ▁would ▁previously ▁have ▁flow ed ▁down stream , ▁becomes ▁tra pped ▁in ▁the ▁res er voir s ▁above ▁d ams , ▁resulting ▁in