From today in history 11/2/16:
The Main street canal has been dredged out this week, about six inches of deposit being scraped up and carted off. Common report has it that a charter for the “Brattleboro Canal company” is being drawn up and that its passage will be asked of the legislature permitting navigation to be opened between the Vermont National bank corner and the junction of No. Main and Asylum streets.
I'd be curious to know more about this, I'm assuming it must have been down between the river and railroad tracks.
Makes me curious about the origins of Canal Street too.
Will have to do some Historical Society digging.