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by cydonian_monk 2623 days ago
The US Army Corps of Engineers is generally and historically responsible for waterway dredging and flood control. It's one of their core (peace-time) responsibilities. These are typically large projects that benefit the public good yet are rather complex and lack sufficient financial incentives for privatization. The wikipedia article [1] gives a general idea of how and when this came to be. (Canals.)

1: https://en.m.wikipedia.org/wiki/United_States_Army_Corps_of_...