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I'm not sure how hills or urban areas block the ability to canoe... Waterways always are locally low and canoe trips on rivers will typically have hills on eith

• ghaff 3y ago
  The parent was asking about getting down to the SF Bay from somewhere in Sierras. I'd have to study a map in detail but I doubt there are much in the way of east/west routes in that area. Also, while there are navigable waterways in cities they tend to be very limited. There's often one river in older cities that flows through the center somewhere. It really depends on the watersheds. You can get to Boston from pretty far north but you would have to cheat by going down the coast from the mouth of the Merrimack River which I think captures all the rivers in southern NH/northern MA.
  • chad_oliver 3y ago
    San Francisco owes its growth as a city to the fact that the Bay provides a connection between the Sierras (and their goldfields) and the Pacific Ocean. Regarding Boston, the interesting thing is that it used to be connected to the Merrimack via the Middlesex Canal. My understanding is that this is silted up now (which you presumably already know) but it shows how many more connections we used to have.
• callalex 3y ago
  There are many dams and gigantic underground pipes that carry the water through the area. It works fine for the water but not for kayakers. For example the Briones Reservoir is upstream of the San Pablo Reservoir connected by huge gravity-powered pipes under the mountains between them. They are in fact redoing them right now.