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<br />GRANGEH/\LLCr,IEK
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<br />Stream and eJ~in Ch~ractQrlstlcs
<br />Grange Ha II Creek, " lelt-Ilank trlbytJry of the Sout~
<br />Platte Rlvo~, j s the t~rthest do~n5tream 01 the stro"""5 stud 100 j n
<br />tn; s vol~rne. The ",,,i ~ stern rises I n the western sectTen of Nort~-
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<br />glen~ ~nd flows eastward ~bout 5.5 ~11e5 to join the South Platte
<br />RivGr just north of East I04th Avenuo. A major trlbutQry, oe5i9-
<br />natod South Fork, rl~o~ in WO~Ter~ Thornton and Joins th~ ~a;n st~
<br />downstream from Irm~ Drive. These streoms. with the other trlbu-
<br />t~ries, drai n about 9 square miles of roll i ng ur lands and lovol
<br />South Platte River flood pl~in. From the heedwaters to tho junction
<br />'wlthSouthFork,thevalleyserellorrowendsteepsldedwlthbod
<br />$ lopes overag i ng 60 foot per m I Ie. I n the '" i :Jd I e reac~', the Vi} I I ey
<br />'~Idens ilnd the gr~c iunt reduces to en ~verago of 40 feet per mi Ie.
<br />^"" the ~tred'" I"'dves tbo upl<lnds end enters tho widE> South rl~tte
<br />Rh'er flood plains, the valley becom<)s InJofi n~ble ilnd the graJient
<br />drop,toilnaVor'lgeof3Qteettothllmile. l-Iere,alsQ,thestre"m
<br />en~ors a orepered clliloncl for conveyence across the flood plai~.
<br />On Gr.'lIge Hall (;roHk, I ike oth~r undeveloped >troeros in
<br />the ~re", ~e f lood rccord~ ere aye i l;ob Ie, tl\:t urbani ,,,tion hilS of'ly
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<br />8nt"~o<1 the b,~si n in th" I",t ton yoar5, end. In trlO tu'lu~e i 5
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<br /><lXPQcted to rn<.Jve tJrthur dO'~nstrean. hero tho Ilooc p lill n is brOilder
<br />and dovelop~nts wi I I be mora susceptible to da~ago fr~ OVerb~n,
<br />f I 'Ow" TIoEl ~pper DQrt ion of the "''' i n stra,~m, loceteJ i n t~ll souto.ern
<br />Norh81enn dave lop'll'~nt district, i 5 c ioso to tho hoadw<1tors ~nd h~s
<br />s=e incldent;;1 tlooJ protection trom ao upstre~m reservoir. n,i;
<br />area COC5 not ~pp{lar to havo " ser iOU5 t lood prob Ie'" <lncl wi I I not bo
<br />jl~C:J~s"~ io t~ls roport. [Jcca'J~~ o. t~", wider flood pl/}i~ d~ol
<br />(jreeter cil<lnCC of O()in8 tI0uJuJfro01I,I<j:,-ir.t;lr1s!+yrJintall r"nnff,
<br />thO} unJev",10ped vall~y; do'~~s~re~.., a~d e1st of thO} )Jo1"~hglenf' ere1
<br />an.:! ~Io,og the So"t~, Fork trlbut"ry In th~ cxp,mdinq ,hornt~n :jc\'clo~"cnt
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