Can you guess the origins of this freshwater vessel?

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I’d think the underwater structure here is something of a clue.

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I’ve no idea how many years ago this house was added.

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Here’s another clue, although it might be quite the distractor.

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I like the off center crane.

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Check 1929 on that above clue.

This is a plan of the ferry WARD’S ISLAND, designed by Eads Johnson, and built for the New York State Department of Mental Health in 1929 by Electric Boat Co., Groton, CT (slow year for submarines?). Steel, diesel, 101 ft. x 32 ft. Retired in 1937 by construction of bridges.

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Many thanks to Norman Brouwer for the above drawing and identification.  Photos by Will Van Dorp, who needs to find out what propulsion engine (s) the derrick vessel has today.  I’ve also not found a photo of Ward’s Island prior to her conversion.   Photos were taken along the Oswego Canal.