I first saw this type of derrick boat and heard it referred to as a derrick boat on the Erie Canal, and did a post about it here.

I haven’t been able to find much out about these boats, but enjoy.  Here’s USACE Derrick boat No. 13,

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two views of USACE Derrick boat Erie,

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USACE derrick boat McCauley,

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a newer looking USACE Derrick boat 8,

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And finally, the 500+ ton capacity floating crane Henry M. Shreve.

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Many thanks to Barrel for these photos.

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