▁New ▁West min ster . ▁By ▁ 1 9 0 6 ▁the ▁original ▁dam ▁was ▁discovered ▁to ▁be ▁le aking , ▁and ▁while ▁rep airs ▁were ▁made ▁the ▁leak ▁continued ▁through ▁ 1 9 0 8 , ▁until ▁a ▁second ▁dam ▁was ▁completed ▁in ▁ 1 9 1 4 . ▁ ▁At ▁the ▁time ▁of ▁the ▁tunnel ' s ▁completion , ▁it ▁was ▁the ▁longest ▁power ▁di version ▁tunnel ▁in ▁the ▁world . ▁Due ▁to ▁se ism ic ▁concerns , ▁an ▁emb ank ment ▁dam ▁was ▁built ▁on ▁the ▁down stream ▁side ▁of ▁the ▁original ▁rock fill ▁dam ▁in ▁ 2 0 0 8 . ▁ ▁The ▁Port ▁Mo ody - Co quit lam ▁Railway , ▁no ▁longer ▁operating , ▁was ▁built ▁to ▁assist ▁with ▁the ▁dam ' s ▁construction . ▁ ▁References ▁ ▁External ▁links ▁Aer ial ▁image ▁of ▁dam , ▁BC ▁H ydro ▁https :// www . b ch ydro . com / content / dam / B CH ydro / customer - portal / document s / cor por ate / s af ety / M arch - 2 0 1 8 - Co quit lam - D am - E mer gency - P rep - Map . pdf ▁ ▁Category : Ge ography ▁of ▁Co quit lam ▁Category : Build ings ▁and ▁structures ▁in ▁Co quit lam ▁Category : D ams ▁in ▁British ▁Columbia ▁Category : D ams ▁completed ▁in ▁ 1 9 1 4 <0x0A> </s> ▁The ▁men ' s ▁ 4 × 4 0 0 ▁metres