drunkenknight9 t1_j15l2ii wrote
Reply to comment by asocialmedium 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
If we were talking about a single river they might be but we're talking about multiple rivers that are tributaries of one another.
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