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<br />-~. <br /> <br />. <br /> <br />. <br /> <br /> <br />approx.imately 1,000 fee! of the channel before it reaches its confluence with the <br />Cache La Poudre River would not be controlled a.~d would remain unchanged. <br /> <br />. Restrict flows passing through the culvert under the Johnson Mobile Home <br />Park, <br />. Stabilize the BNRR embankment on the upstream side and construct a <br />seepage barrier behind the embankment in order to detain flood flows behind the <br />BNRR emhankment, <br />. Construct a combination siphon/flume structure at the New Mercer Canal, <br />. Construct a combination check/spill structure and a lloodway spiII and stilling <br />jXlnd at the Larimer County Canal No. 2 crossing, <br />. Construct four box culverts at Drake Road, <br />. Construct a stream dctention pond upstream from Taft Hill Road, and <br />. Construct thrI:C !>ox culverts under Taft Hill Road. <br /> <br />The drainageway plan outlined the flood boundaries for the basin from County <br />Road 52 (3 miles upstream from State Highway 14) to the conflucnce with the Cache <br />La Poudre River. The delineation of flood boundaries completed as part of the <br />drainageway plan was determined to be invalid because flood flows divert to the west <br />from Boxelder Creek channel above County Road 52, and the flood flows return to <br />Boxelder Creek channel near State Highway 14. This diversion of flood flows was <br />not taken into account in the drainageway plan. Consequently, the alternatives in the <br />drainageway plan for Boxelder Creek could change. The City delayed all plans for <br />channel improvements on Boxclder Creek until the revision of the 1981 drainageVr-ay <br />plan is finished. <br /> <br />The construction cost for completing these channel improvements was estimated <br />by Engineering Professionals, InC.,lo be $6,214,OOO(ln 1988 dollars), with a benefit- <br />cost ratio of 0.97. <br /> <br />SPRING CM}.:_K <br />The Spring Creek Master Drainageway Plan wascomplcled for the City of Fort <br />Collins in March 1988 by Engineering Professionals, Inc. The City COllncil approved <br />the plan in September 1988. The plan recommends a system of improvements <br />throughout the drainageway below Spring Canyon Dam which would provide a <br />lOCI-year level of protection. The Spring Creek basin plan rewmmended the <br /> <br />The City or Fort Collins completed construction of the storm drainage <br />improvements on Spring Creek from College Avenue throllgh the BNRR in <br />December 1990. Work on the reach from Stover Street [Q Stuart Street is underway <br />and is planned for completion in 1993. The City of Fort Collins no longer has <br />interest in Corps participation in construction or nood control improvements on <br />Spring Creek because the preliminary design for the remaining improvements <br />upstream from Taft Hill Road has been completed, and the Drake Road <br />improvements are 10 be completed by the City in a fairly shon time frame. <br /> <br />fnl1nwi.." ;"'"......,.........",. ,,~~:..,,:~~~, .h~ ~M<l..~~.~ ",.h~ "'--..- Lo. rOudr,~ Riv;;;r' <br />. __~..._.Q_......w _'''w''_, .._......_."'... ..... ~"......,,~ u. u." .........." _. <br /> <br />. Construct a new, larger culvert under the UPRR, <br />. Enlarge the bridge opening at Welch Street, <br />. Replace tl,,,, bridge~ ill Sluver Sln:ct and Stuart Street, <br />. Widen the existing grass.lined channel between Stover Streel and Stuart <br />Streets, <br /> <br />. Cot's~.!e! ~el'.'. !arge~ cU!l'e!"'~ u:lde~ !.l-:e ENRR, <br /> <br />. Construct a new channel from College AVel1ue to the BNRR, <br /> <br />4-7 <br /> <br />4-' <br /> <br />- <br /> <br />. <br /> <br />. <br />