Two barges moored using steel cable and tires - yes, tires - big truck tires. The tires act as shock absorbers between the barge and the mooring point. Called "snubbers", they take a bit of stress off of the steel cable when the barge surges and pulls on the cables.
Notice how stretched the group of five tires are. These barges will be unloaded at a company located at the confluence of the Illinois River and the Illinois Michigan Canal's steamboat basin, the end of the I and M Canal. LaSalle, Illinois
Prior to finding this, I noticed a few groups of tires tied with steel cable over an inch in diameter. I assumed they had washed up on the bank, but then I found more tied to the shore. These were probably placed in specific locations just to moor barges waiting to be unloaded.
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