Word: cassions
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...bridge will not interfere with the mode of transportation. The piers are 500 feet apart in order to allow these great tows to pass through easily. As the Hudson at Poughkeepsie is 70 feet deep and has a large mud deposit, it is necessary to lower a large cassion with double sides. This box is 100 feet long, 60 feet wide, and 60 feet high, and weighted with gravel. Through holes in the top the mud is dredged out by a large machine, which lifts ten tons every five minutes. After the mud is dredged out the space is filled...
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