▁banks ▁of ▁the ▁Le ith . ▁One ▁of ▁these ▁follows ▁the ▁course ▁of ▁the ▁stream ▁from ▁the ▁northern ▁end ▁of ▁Wood h augh ▁Gard ens ▁to ▁connect ▁with ▁the ▁Ross ▁Creek ▁tracks , ▁passing ▁as ▁it ▁does ▁a ▁major ▁we ir ▁( the ▁B ould er ▁T rap ) ▁which ▁was ▁put ▁in ▁to ▁prevent ▁a ▁repeat ▁of ▁the ▁major ▁flo oding ▁of ▁the ▁Le ith ▁in ▁the ▁early ▁ 2 0 th ▁century . ▁The ▁walk way ▁also ▁passes ▁the ▁remains ▁of ▁the ▁former ▁Wood h augh ▁Qu ar ry , ▁which ▁operated ▁until ▁ 1 9 4 9 . ▁ ▁The ▁sides ▁of ▁the ▁Le ith ▁Valley ▁are ▁not ably ▁ste ep , ▁especially ▁in ▁the ▁area ▁around ▁the ▁start ▁of ▁Rock side ▁Road ▁( also ▁the ▁location ▁of ▁the ▁confl u ence ▁of ▁the ▁Ross ▁Creek ▁and ▁Le ith ). ▁At ▁this ▁point , ▁ste ep ▁cl iffs ▁fl ank ▁the ▁valley , ▁and ▁nearby ▁the ▁Ross ▁Creek ▁passes ▁through ▁a ▁narrow ▁can y on . ▁In ▁the ▁lower ▁reaches ▁of ▁the ▁valley , ▁the ▁valley ' s ▁walls ▁are ▁still ▁ste ep , ▁though ▁not ▁vertical . ▁The ▁Dun ed in ▁Northern ▁Motor way ▁sk ir ts ▁the ▁northern ▁edge ▁as ▁it ▁passes ▁by ▁the ▁sub urb ▁of ▁Dal more , ▁and ▁along ▁the ▁southern ▁edge ▁of ▁the ▁valley , ▁a ▁walking ▁track ▁r ises ▁sharp ly , ▁connecting ▁Wood h augh ▁with ▁Pro spect ▁Park , ▁New ▁Zealand . ▁This ▁track , ▁the ▁Bul lock ▁track , ▁was