FLOOD06000 - Laserfiche WebLink

Home Browse Search

U. S. Highway 85 to I::J.fJ__~_p.r:.a\",,[llLJ2,l.?Land_.lc7:~ The 100 year future fJ.ows with impr()v~d dr"ainageway conditions will be 7,400 cfs in the reach. Downstream oJ LS. Highway 85, the First Creek channel is fairly well defined. IJoHever, upstream of U.S_ High- way 85 the channel is not defined. Ther(~ are f'our major crossings in this reach. They are, U.S. Highway 85 a 1:. Station 143+80, Union Pacific Railroad at Station 149+30, East 104th Avenue at Station 163+90 and Interstate Hi:~hway 76 (formerly I-80S) a':. Station l7I+40. The above four crossings have been designed to IJas:; lhc IOO-year future flow wi thout overtopping. In order to accompli sh th:lS, the existing inverts at these crossings have to be lowered. 'rhe first Creek has been chan- neliled from Station 128+50 to O'Brian Canal at Station 216+40. The chan.el has been designed to pass the 100-year future floH. ~J'~lwa~ The U.S. Highway 85 at Station 1.\3+80 has a 5.0' x 6.0' CBC. This has to be dismantled. A neH CBC to pass t.l1e 100-year flow wiLhout overlopping has been provided. The cl)lv(~rt ~il:l have four barrels each 13.0' wide x 9.0' high in size. The exi:;t,ing e:Levation of the roadway Hill not be altered. Riprap protection ha:s to he provided both upstream and jownstream of the CBC. The telephone cable under the culvert has to be r:-located. Union Pacific Railroad The Union Pacific Railroad aL :;tat.ion 149+30 has a 3' x ;"8" CBe. A new bridge with a single clear !i]Jan ct ~54.0! and with a 10.OT dept:l of watelCway has been provided to pass the 100-year HOH "ithout overtopping. At the downstream of the jJJ,idge invert a 2.0' drop has been provided. Suitable rip rap protect'on 3re required hoth upstream and downstream of the bridge as shown. [I [_.,~