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<br />Boxelder Creek channel would retain its natural state, The proposed access roads for <br />sludgeapplieationarca, whichparalJel the creek on either side, would be used to confine <br />the flood flows within the channel for about I mile. The last approximately 1,000 feet <br />of the channel before it reaches its confluence with the Cache La Poudre River would not <br />becontrolJedand would remain unchanged, <br /> <br />. R~.nl"r~ th~ hrid~es at Stover Street and Stuart Street. <br />. - <br /> <br />. Widen the existing grass-lined channel hetwccn StoverStrcctand Stu artStrects, <br /> <br />. Construct new, larger culverts under the BNRR, <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 confluence with the Cache La <br />Poudre Rivcr. The delineation of flood boundaries completed as part of the drainageway <br />plan was determined to be invalid because flood flows divert to the west from Boxelder <br />Creek channel above County Road 52 and return to Boxcldcr Creek channel near State <br />Higbway 14. This diversion of flood nows was not taken into account in the drainage. <br />way plan, Con~equenlly, the alternatives in the drainageway plan for Boxeldcr Creek <br />could change, The City delayed all plans for channel improvements on Boxelder Creek <br />until the revision of the 1981 drainageway plan is fmished. <br /> <br />. Construct a new channel from College Avenue to the BNRR, <br /> <br />. Restrict flows passing through the culvert under the Johnson Mobile Home Park, <br /> <br />. Stabili~.e the BNRR embankment on the upstream side and construct a seepage <br />barrier behind the embankment in order to detain flood flows behind the BNRR <br /> <br />embankment, <br /> <br />. Construct a conlbination siphon/flume structure at the New Mercer Canal, <br /> <br />SPRI~G CREEK <br />The Spring Cru:k Ma~ler Draillagcw<l)' Pian [or the City of FOft Collins,.,as com- <br />pleted in March 1988 by Engineering Professionals, Inc. The City Council approvoo tile <br />plan in September 1988, The plan recommends a system of improvements through\Jllt <br />the drainagcway helow Spring Canyon Dam which would provide a loo-year levd ()f <br />protection. The Spring Creek basin plan recommended the following impnlVemcnts, <br />heginningat the Cl1nfluenceof the Cache La Poudre River: <br /> <br />. Construct a combination check/spill structure and a flo<.lrJway spill and stilling <br />p<.>nd at the Larimer County Canal t\o. 2 crossmg, <br /> <br />. Constmct four box culverts at Drake Road, <br /> <br />. Con~tnlcl a stream detention p<.>nd upstream from Taft Hill Road, and <br /> <br />. Construct three box culverts under Taft Hill Road, <br /> <br />. Con~truct a new, larger culven under the UPRR, <br /> <br />. Enlarge the bridge opening at WckhStreo:t, <br /> <br />The constnletion cost for completing thc>c channel improvements was estimated by <br />Engineering Professionals, Inc., to be $6.21J.,OOO (in lC)~~ dnllar~), with a bcneflt'cost <br />....t:oofO.97. <br /> <br />4~7 <br /> <br />'"' <br />