Chicago1871 t1_j14jhox 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
Thats around where the canal starts.
The actual portage was a swamp. It was only navigable after the rains in spring and dried up by fall.
You were on this.
https://en.m.wikipedia.org/wiki/Chicago_Sanitary_and_Ship_Canal
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