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slopa is app~oximately leg feet pe~ mile in the ~atershe~, and only 6J feet pe~ mile within the study ~aach. Streambed e18_ v~tions ~ithin the study reach va~y from epp~oximatsly 4,708 fast at the mouth to 4,868 fast at Mile 2.52. flood plein widths would vary from lees than 5U fest Just belo~ State Highway 96 (Thatcher Avenue) during en Intermediate Regional flood to ~ mexi- mum of 40a feet"t the DenV8r and Rio Grende Weotsrn Railroad bridge during" Standard Project ,lood, excluding the Arkansas River flood plain area. Pertinent drainage areeS of Goodnight Arroyo ere 9iven in Tabie 5. Ths ColoradO State Highway 96 (Thatcher Avenue) bridge, Bessemer Ditch.Aqus Drive crossing, end Red Creek Road bridge are located at Miles 0.45, 0.51, and 1.66, respectively. The Denv~r ~~d Ria Grande ~ester~ Railro~d cros~ee Mouth 0.00 ,., the nrroyo over an eO-foot ~-span structure th~t ie skewed 10 de_ greee_to the nor~al direction of flow. The Standard Project ,lood would overflow the roadway 1 foot deep, but the Intermedi_ ate Regional flood would not reach the ro~dw~y. Head lossea would be 5.7 foet d~ring the Stnndard Project FlOOd, ~nd 4.9 fBst d~ring the Inter~odiate Regionel Flood. ColoradQ Stata Kighw~y 96, extending west~~rd on Thatcher Avenue, cr03ses the streambed Over a 26-foot wide by 16~ foot hi9h cnncrete.arch bridge. The floor of the bridge wo~ld nat be overtopped by either tha Standard Project or the Internediate Regional flood. Kead losses at the bridge would be 13.1 feet end lC.6 feet, respectively, for the Standard Prnject ,lood and Inter- mediate Regional Flood. The 8MSAIWc Oitch_A~~a C.civE ~rroYG drdcagr,,"~y, ~n oval-sh~ped corrugated ~etal culvert, I7.S,feet hi"h and 15 feet wide, ie skewed 78 degrees. ~aither the ditch nor ~he drive will be overtopped oy the St~nd~rd Project or Inte"""..diete Regional Flood. Th~ head losses would oe le.S feet during the Stendard ProJsct FlOOd, end 15.5 faet during the Intermaoiate Rogional Flood. The Red C~aek Road bridge over Goodnight Arroyo ia e 22-foot singla_span wooo 8tru~ture that is skewed 4G dagr~as. The St~ndard Project ,lood would overtop the floor by 0.2 fe~t, while the I~termediate Ragionel Flood ~ould not reach the floer. Head l065es at the bridge during the Standard Project flood and TA8LE 5 DRAINAGE AREAS IN WATERSHED or GOODNIGHT ARROYO Locdion f\'lU.. Above Mowth Drainage Are" D.4C mile~ ~P$t"U8m uf Red Creek Rued. 2,C7 5.l. Developments in the Flood Plain Plata ? ~hmlJ~ the flOOd .D,,,ins of GDounight I<.royo for the .e~Gh covarad by this .epurt. This stream ch~nnel li~G just outside P~eblo'e oxisti~g ~estern boundary end the region is p~e~antly only sparsely devQlop~J. Th~ city of Pueblo hds mainteined a~ open dump upstr~~n of Bessemer Ditch that co~~tricts the channel so'''ewh",t. Progr~ssiv8 L.roaniz"tion in the "rea is ~on~idRred probable ~ithin the next fiv~ y~~rs. ~~f.d,,~~ A~r~Q~ t.h.. S+:rA~m l~~cr~~~i~tc ~Dgic~~i Flood ~c~l~ ~~ 3.2 fo~t ~~d 3.3 f~ct, rc~- There are three vehicular ~ridge. and ~no ~~il~oad b"idS" acros. Goodnight Arroyo in the 2.5 mile et~dy ra~ch. Pho~ographs of the bridges arc shown in figures 7 ~nd 8. The De"ver and Rio Grand.. ;"estern Railroad orid~e is j~~t upstre~~, of the Goodnight Arroyo-Ark~ns~s River ,"cnfl~ence at Mila C.18. pectivaly. Table 6 lish pertinent elev.1tiol1S for the brid~e8, and relates their ~nderclearance elevation to the crest of tha l~ter~edi~te Region~< Flood. A discussion of the vari~tla " "