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National Geographic : 1993 Nov 30
Contents
formr chmica is lassfiedas "prbabl humn cacinoen, meanng hat t wll lkel caue cnce; atazie isa "ossile uma carinoen" EA tanars st maimu o theepars train parts per billion. An ve mre emndngburenonth waer ite aasin o seimn.tsoeplcs logth pprrecesiti flin n h rive andbacwates,nd epecillythe lredy sallo imound VO ment. Asa reult f th dislacd waer sekin outetsnew han nesae en supurd ndteshp fh ivri cagng h gret quti hbiatofth nrter bckatrsofth Msssspp seem tobe o anirrversblecouse t beomin teresrialhabtat Muhofte pel fth perrve oldb ls hefo h glmern pos oldvnih ndmssn towol bh shmls brigoffosan l h ohrmsi n aneo h creatres brne n thebackwters "Ter i n qesin seimntiste ea tret oth upe . Misissppitoay, sad ohnF. ullva, wterqulit spciais fo = ' the tateof Wsconin' Deprtmet ofNatual esouces."In ddi tint temteilwahn it hervr easeo roin teei ade aeia sarsuto h ivrctig e hnel.Te o the edient hatenteed he tibuary looplais dcade ag is til thran ih ev rissmeo ha oesi. Sulvnha enwokn n tde fh perMsisip ic 196,ad urn ta tmeh hscocldd ha heoerllqalt of te waer s beter ow han t wa atthe penig o Word Wa II "It ay nt bethatwe ae upto lvel ne, ut tere re idicaion thtth ivrha mpoedad otius odos,"h si. ecie the oweing f lvelsof mmona ad aninceasein he ppultio of mink along the banks. ~ri~ Th nmero mn tkn ytrper nh16s alw appretl beaue heani al wre aknginPCI-o p lycloi- esprae ea ~~~~%Dubuque, Illinois. ALL TE CHEICAL intrducedintothe rver, ew, f any are hilesome ebat of fish, although levels are falling. defenses in Louisiana~~ne~~ PCsae rw o eiett hihte atc ndcnrean kepteMsssip for hudre yers.Buttraficon he issssipi-ecratinalboas fom uttng ne as wll s comerialbargs-i contanly tirrng he ilt nd esus corseand tradin pedig h cemclsinoth ptho vcummothsees y ih.ciis ha epndo Inte srin of197, 60000pouds f crp cugh inandnea Lak It flw. ngieer Pei o h uprMissipihd ob dsroe ecueofte butes ak oh
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