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To enter the lake from river St Clair two channels have been provided, with retaining walls of cribwork, one for upward, the other for downward bound vessels.

Where they are absolutely necessary a serviceable bridge is made of cribwork.

A landing is built of cribwork and the logs are simply rolled on the truck with peavies or cant hooks, or a parbuckle system with skids and horses is used.

Normally five or six sets of beams extended this cribwork almost to the ground level.

Because a drive turned down the rapids would simply float all over the lake and have to be gathered up again, a task involving much time and trouble, the logs were always put through a narrow, inner channel protected by cribwork and booms, and caught in other booms below.