nye1387 t1_j13q15l wrote
Reply to comment by Obiwan_Salami in When this bridge in Fort Benton, Montana, USA was built 1888 it was required to have a swing span to allow steamboats to navigate. It was considered the furthest navigable point on Earth, more than 2,700 miles from the Gulf of Mexico. by triviafrenzy
It's entirely possible to get to the Mississippi from there - but not without canals or portaging.
ETA: https://en.wikipedia.org/wiki/Chicago_Portage?wprov=sfti1
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