Show welland canal lock at humberstone Is longest one of 0 the locks on the welland canal the guard lock at humberstone 1380 feet long Is the longest in the world says the detroit news it Is not high however but merely provides for adjusting the canal level to the varying level of 0 lake erle erie the two to locks on the american side of the sault ste marle canal are 1350 feet long and 80 feet wide with a lift of about 22 feet the welland canal has seven lift locks each feet long iong 80 feet wide and each with a lift of 40 feet beef eef the three twin locks at thorold have a total lift of feet I 1 which la Is 54 feet greater than the gatun galun locks of the panama canal the panama canal has three locks at gatun galun near the atlantic end the pacific end has two at miraflores and one at pedro 31 maguel iguel the total lift belne being 85 feet the usable length of these locks Is 1 1000 feet and the width feet these locks are in pairs from the engineers standpoint the panama lock system Is the most Import important aliL |