▁have ▁been ▁proposed ▁to ▁be ▁built ▁on ▁the ▁main ▁stem ▁to ▁control ▁flows , ▁but ▁these ▁plans ▁have ▁largely ▁st alled ▁because ▁of ▁the ▁river ' s ▁unique ▁free - flow ing ▁status ▁and ▁its ▁importance ▁as ▁a ▁wild life ▁habitat . ▁Sac r amento ▁County ▁officials ▁continue ▁to ▁lo bb y ▁for ▁the ▁construction ▁of ▁a ▁flo od - control ▁dry ▁dam ▁above ▁Ran cho ▁M uri eta ▁at ▁Michigan ▁Bar . ▁Such ▁propos als ▁are ▁still ▁the ▁subject ▁of ▁on going ▁debate . ▁ ▁See ▁also ▁ ▁List ▁of ▁rivers ▁of ▁California ▁ ▁References ▁ ▁External ▁links ▁ ▁Cos umn es ▁Research ▁Group ▁Cos umn es ▁River ▁Task ▁Force ▁Lower ▁Cos umn es - Lower ▁M ok el um ne ▁W aters hed ▁Profile ▁— ▁U . S . ▁E PA ▁Region ▁ 9 ▁Cos umn es ▁River ▁Pres erve ▁Cos umn es ▁River ▁W aters hed ▁Project ▁datasets ▁— ▁California ▁Environment al ▁Information ▁Catalog ▁ ▁( Ge ographic ▁Names ▁Information ▁System ) ▁▁▁ ▁Category : R ivers ▁of ▁the ▁Sierra ▁Nev ada ▁( U . S .) ▁Category : M ok el um ne ▁River ▁Category : T rib ut aries ▁of ▁the ▁San ▁Jo aqu in ▁River ▁Category : S ac r amento – San ▁Jo aqu in ▁River ▁D elta ▁Category : R ivers ▁of ▁El ▁Dor ado ▁County , ▁California ▁Category : R ivers ▁of ▁Am ador ▁County , ▁California ▁Category : R ivers ▁of ▁Sac r amento ▁County , ▁California ▁Category : R ivers ▁of ▁San