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<br />Fort1f1cation C~'eek J(ep~ t.
<br />:Revise!! 30 Sap 48t,~~::
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<br />Fortifice,tlori Creek and trlbutar:f.es in the mounta1.r~o;.lS upstream parts of
<br />the basin are perennial except during dry yoarfl. and tributaries in other
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<br />p~ts of the basin ate intermittent.
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<br />10. TopogrBpby.--Rolling hill., whioh con.titute mo.t of the ba.in!
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<br />are flanked by the Elkhead Mountains in the north pavt of the oaBin. Narrow
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<br />.yalleys are along the straamso Elevs.t1oZl.8 in tha basin r8ll€e frofll about:
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<br />10.500 feot in the Elkh.ed Mountain. to about 6,200 f..t n.ar Craig.
<br />11. GeoloKY and Boils.__I.n, ~e..'1orel. the mo,mtaiua and gently sJ,o:p1ng-
<br />hi1~e,. which. compose B. large pll.rt of the Fortification Creek B9:siJ1, are ot
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<br />Sedilnantary fo:nnat1oi.1.so SOIlle of thes8 are htghly rr:etamorphosed... An ign8Q11B
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<br />intrusive formation aovers a re]A.tiv.I3J.:r sms...:.l a:rE::il. of the basin in Elkhead
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<br />Mountains$. The valleys flloDg F,):..~tif::'r:ation Croel:: and aJ.~')Dg YS.I:lpa :aiver
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<br />near Craig, COloo, are all'lVinl fille o~ varying depth~ The soil in tha
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<br />valleys 1s fertile alid cr'Jp yif:o~.de are high') The soils that reeul t from
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<br />the sedimentary for~ations in the Fortlfic2tion Croek Dasin betw~en Craig
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<br />and the junction of tittle :Bear and Fortific:l.tion Creek are. i:n general, of
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<br />.adeq'Wite depth and ferUl.i. ty for d1'7....faI.mec. 16~'aiD.fJ'"
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<br />12~ Stream characte~~ice~__~he elevation of Fortification Creek Is
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<br />approxtDa~ely 10,000 f.et a~ it. .ouroe and 6,170 feet a~ it. '~nfl~nc. with
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<br />Yampa River. In the uPPf:lr part of H,~ c1rnl:r.e.ge bau:in, the oraek 1s in.
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<br />steep-we.l~ed canyons~ About 25 miles nor.~h of Craig the c:reek enters a
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<br />na~row valley bordered by rolling hills, tb~ough which it meanders to the
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<br />confluenoe with Yampa River. The low-flow o.L2nnel re,Dgea from 10 to 30
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<br />f..t in width end from 5 to 15 fe.t in d.pth. ~he slop. of the channel
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<br />ranges from about 500 f~et per mile in the moun't.ains to al:out g feet per.
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<br />13. 'V.lletat1on"",",A hea-q gro\<th of /l:l'a.... oovere th.nonoul,ttvato<i
<br />)?art of 1Ib,e alluvial eoile ill, the et;ream vall eye. Grasses and sagebrush
<br />are on the hUrls in the lower pa.rt at the besin.. Forests o~ aspen, pine,.
<br />fir, and spruce grow above elevat~o~ 9,OOO~ B~ush and grasses ~re ~o~on
<br />1~ the upper ba.in.
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