USACE Begins $1B Soo Lock Project
Iron ore-carrying vessels don't do rapids, particularly when heading upstream. To get around them, structures called "locks" are built — sort of stairs for boats. Vessels float into one end, entry gates are closed and the level of water inside the lock is raised or lowered to match the level outside the gates at the other end....
from RSSMix.com Mix ID 8246474 https://ift.tt/3hB9MEF
via Inchiriere buldozere - Tuscher & Milas Company
from RSSMix.com Mix ID 8246474 https://ift.tt/3hB9MEF
via Inchiriere buldozere - Tuscher & Milas Company
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