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The Upppr Cololildo RivH Bitsin Comp.1rt of 1948 rfividerf and 1-.. ilpponioned the '.later apportioned to the Upper Basin oy thE" Cololado River (D Compact, allocating to Arizonil 50.(100 aCI(>~fpet .1nn\lillly. 1Jilh the rE"m...ininj:t c., ....a(er allocated to Upper BoIdn Slates as follo...s: {;olol<1<1o. 51.75 percent; t. Ne.... Mexico. 11.25 pelcent; Utith, 23 pfor-Cf'llt; arlll Vyominp;. 14 perl'ent. The compacl permi l ted the authol izat ion of Fedel"al proje(;ts above Lee Feny. 5tates of the I.ol,'er B<l<;in. hO....Pvf>r. rlid not agrpt':' to il compact for the apportionment of 1Jatel'S in the Lover Cololddo River Basin: ;\c(;oLdillp;ly, a Supreme Court decree (Arizona vs. Califonda et al.) in 1964 alloca(ed use of the mainsrream of tta> rivel helov Lee FeflY "mung Californi.1. Nevad.l, anrl Arizona and of the Gil" River hetveen the Sr.ltes of Arizon" aud Ne.... Mexicn. Nevada ViiS apportioned 100,000 acre"feet C\lInually, Alizona 'J<lS apportioned 2,800,000 acre feet annually, and Califolnia vas C\pportionprl 4,40tJO,OOO aC're-feet annually. The dpcrpe al!';o permirtt'd F(>del~l .....1Ier plojects and the development of Indian tlibal lands to proceed. 2. \later OUOlljt.x Although a numbp!" of ,..ater quality lelated legisl.1tivp. actions hiive bepn t.'lken 011 tbe Stilte:> and FedC>l"o1.1 levels. four Fedel"al acts ale of special <;igniflcancp to the Colorarlo River B<lsin_ the V"ff>r l)uality Act of ]Q65 and r-platE.'d amel1rlmPllts, the Fedelal \I,lt('r Pollutioll COlltrol Act Amendments of lq72 (ruhlic La.... 92-500), the Cololado Rivel Basin 5alinity ContloI Act of 1974 <lS amended, and the Clean Vater Act ot 1977 as amended. Also central to Vilter quality is<;ue!'; .lre agreements 'Jith Mpxico on Colorado River system valers entering (hat COUlltl-Y. The fir<;t of the.c::e. the \JaIN Oualiry Act of 1"165 (PHhtic Lillo' BQ :>34), amended the Fl'dE'l,ll '.'atel Pollution Control Act ;1l1(j pstahli.<;hed a Federal Vatet Pollution Control Adminislralion (11010' .ErA). Among other provisionc:, it refJui rerl c::f;ltps to ClrlOpt VatE'r qual i ly CI i tel"ia fO! intel Slilte vaters in.<;irle their bouurl.uil's. The Sf'Ven Bil<:in St.ltes iniliall}' devE>loped ....aler C}Il.llily slilnd.llds ....hi('h did not inclllde nUIIIPlic s.llinilY ClilPlia tor the Colorado Rlvl'r. primarily 11('Call~e of technici'll constraints. In 1977, lhe States agre-ed to a policy vhich call~rl for the m.lintenance of salinily concentrations in the l.ov(>[" Colorado River sYStem at or belo.... existing levels. ...'hile the Uppel Basin States conrillllpd to r1pvf'lop theil ('omp~('( appoltioned ....aters. The Stiltes .<;ugge!"tlo'd thitt Rpclamal ion should h.lvE.> pi imary lesponsibility for investigafing, planning. and implementing the ploposed Colol.ado River Basin Salil1ity Conllol Proglam. The enactment of the rpdetal Vater Pollution Control Act Ampnrlment of IQ72 affected salinity cuntrol in that the legi~LHi()n ....as interpreted by ErA to require numericill st<lnrl<'lrrls for s",liniry in thl' Colorado Rivel. In response, the Basin States founded the Cololado River Basin S.llinity Control Forum (Forum) to develop numeric SOlI ini ty cri teria and a h;udnlo'idp plan of implementation for c:;alinity ContloJ. The Basin St,Hes held public mpetinp,s on the proposed st,lnd;uds as required by the enacting legis-lilt ion. The Forum recommended that the individual Bas:in Statf's ;trlopt the report. Vater Quality ,?tandards for Sal!nity Including Numeric Critel ia and Plan of Impiementa~!E.~ fOf S,l!inity Contlol, Colorado River Systf'~. The rHopnc:ed "-'atE>l qll.llity st.lndard c.lII(>d fOl m.linten"'l1ce of flov '..eip,hted i\Vf"Ii'lp;e lotal rlisc:;olved solids nOS) conCentrarions ot 72' milliy,rilms per litl'l (nlgll.) be 10"" Hoove[ D<lm. 7!.7 mg/L bpto.... Parkel O;tm. and 87Q mg/! at Impel ia} Dilm. Included in the JJ