Laserfiche WebLink
<br />COMMENTARY <br />SHEET5Of45 <br />STATlON 2014-+{)QTO 2074"'00 <br />REACH 1 <br /> <br />COST ESTlMATE <br />SHEET50F45 <br />SOUTH PLATTE RIVER <br />STATION 2014...00 TO STATION 2074+00 <br /> <br />CONSTRUCTION <br /> <br />TIle channel nea~ Highway C470 is cont~ol1ed, to some extent, by the b~idqe <br />c~ossing. Downstream of C470 a drop st~ucture has been constructed. <br />FurtherdOWl1stream the channel exhibits a tendency to meander. There is <br />e~idence of ban~ erosion, the st~eam is b~aided and there is e~i<lence of <br />relocation of the river by as much as 400 to 500 feet. This portion of the <br />dver flows through the South Platte Par~ (Littleton Floodplain Park). The <br />overban~s a~e vegetated with trees and brush. The weste~n overbank has tWD <br />qravel pit lakes. <br /> <br />Drainage lmp~ovement costs <br />Street c~ossing costs <br />Utility relocation costs <br />Total construction costs <br /> <br />Engineering and contingencies <br />(30% of tota1 construction costs) <br /> <br />Property acquisition <br /> <br />TOTAL IMPROVEMENT COSTS <br /> <br />The p~oposed improv€'11ents on tni s sheet consist of ba.nk stabi 1 izat ion. In <br />the vicinity of the C470 crossing, riprap bank stabilization is p~opo~ed on <br />both ban~s from Station 2052...00 to 2065+50. fhe p~opoSf'd gradation Is <br />USDCM Type ~ and shou1d be installed in accordance with Detail II shOwn on <br />Sheet 44. Dow'!stredlQ of the drop structure, between Station 204g...50 and <br />2052+00. low flow bank protection is recommended along the east bank of the <br />river. This area exhibits some instilbilityand should be stabi1ized. The <br />bank stab!l i~atiQn OIi 11 consist of riprao with vegetation. The west bank <br />of the South Platte River, between Stations 2014+00 and 2049"'5oshouldbe <br />stabil ized "ith ripr~p with veget~tjo~. Th1 s bMk protectlon "ill prevent <br />eros ion from jeopdrd i zi ~g the em~ankme'!t ~dj acent to the gra~el pit 1 ake. <br />The itlstall at iotl of this rlprop "ith "~g~t~tion/slope prot~ct io'l should b", <br />in accordance with Detai1 B shown on Sheet 44. <br /> <br />Operation and Maintena.nce <br /> <br />The improveme'!ts proposed on this Sheet do not decrease the lOO.ye~~ deli'!. <br />edted floodpl ain. As such, f100dpl ~in regul ~tions should be enforced. <br />This "ill insure that no imprudent development occurs in the H)r).yea~ <br />f ~ o~d p 1 J in. <br /> <br />520,900 <br /> <br />520,900 <br /> <br />155,300 <br /> <br />677,200 <br />Q4,320 <br />