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<br />DE:'r.:HIPl'ION OF' BASIN
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<br />G1J
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<br />re"dis" bro~n in calor and have no ",'cembla"., to 'it/'c'r th, underlying
<br />formaCk", or adjav'nt arc,,~, T!,.,,~ ar., ex", l'nt agriCultural coils,
<br />but in t:'i1.ny ;".1..1"'<.1.:... tOPot:raph,i' makt::: up.ricultur( <li<"f"ieult.
<br />
<br />C. Climate
<br />
<br />TI" Cclo,'a,lo IEvcr fucin hue eli""tic eX',reme.,. ,'anginr bct'.oen
<br />.v"",'-round Snow "over and heavy pre"iPitatim, on the high pcab of' the
<br />Rocky '.lountain" to d,s','rt co,,,[j<,ions ...ith very :ttle rob in the South_
<br />ern part or t"e 'hein, This '.ide "an,:e of eLi~.ate is caused by dUfer_
<br />,'n-". in altitude. latitude. and by the cOni'ieur"tio" of the higl, mOU11-
<br />tain ranges. The encircling mOUntain rar",e" Ob,t'''Wt and deneet the
<br />air masues to such an extent that 'ctorm !'"tten," are ~or" erratic than
<br />i" most other part" of the United ctato". Most of the moistw'e for pre-
<br />cipitation on the Upp,.,. &.oin is derived from th" P-dc'ifie' Ocean and the
<br />Gull' or Mexico, The Pacific SOur'e prodomi""te" e,'n,'r"liy from OctOber
<br />ttu'o<'I;h Apr II an,,. the Gulf SOurce dW'i"F Ll,e hte cpr ;nc und early
<br />:.iLL'mnrr.
<br />
<br />In the northern part '1' the ""sin most I"r'''"pitntion 1'alls in the
<br />form of winter .'no',,, and spring rains. C,unmer storms are infrequent
<br />but are SOmetImes of cJoudbw'ct ink"Sity in local Led tir,",. II. the
<br />~Ore ""Id southern porUon the prin,'ipul rair,y '.a.'m; 1. in thc winter
<br />month<< with oecaeiona iocal'",,, doudbur.t" '" ',h,c'ummer "'''" full,
<br />
<br />r:xtrem,'s of "be,p'.'rature i" the bu<<in rane, , fru~ ;0' F, bdow zero to
<br />1 :0' F. abOVe zer., 711c nor!.h,'rn POrtion or Lh. ooo;ir. L cha".".terized
<br />by . hart, warm sun-,m."" and long, cold ...int"r,., '''''' nuny mouot.,o areoo
<br />""c blanketed by .kep 'now aU W'nter. TIle )uti" 1', j,orlion .f the """in
<br />ha_ 1.'''1', hot "ummel'''. Po-<1"t1'o.11" "'Ontion'n. "o,.j, 'e, ",oj " mo" "010-
<br />pletr auscTlce Jf t'1"_:':~zi:'.g t,~'mp 'ratur,_.~..
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<br />!L'\'"l" h.., ""_. th,_ -r;.t ..l1'(' t.a. r:
<br />3~: . tUCt.,-; of tht h;.tJ.d"'a:..,-'l'~~ at',-::",-
<br />::...::;. 1; '-.'1, ,:o:...tt" r: ,~d .' t!,
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<br />.... 3. .0:.5
<br />'P',-a- i 'n .cn +!,(
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<br />D. Vt!.,: _3tion
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<br />Area" ,[ ),'rhc,' ",evo',ioL "1" "OVer'", w"', for, 'c ,_ pi", , "ir,
<br />opruCe . and ol1ver_s', emed aopen., brok" by ".c.ai r ',"'I. """'ountoin
<br />;oeadowo, Pinon "oJ jun'pe,' Lree, , i',tel'op'or ".' ,L ,..'rub .a.<, mounLein
<br />mahogany. cobb it bru"h, 0"'"." graD 'es. and ,-, br itmlL uo~ in the
<br />iOlLer",wdiate elevaUons 01' che "c.,a nod plat .." ","0,,_, [.arce ='ac in
<br />the Upper 'la, ir. are do;oi".atea cy ti' oagebra,1. "'. ", ,a, \'.,ralion.
<br />"any of the 'trea", are OOhercd Ly ,'otton~oo"_. .".. """ "aLt eeJrlr,
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