The C&O Canal Towpath [1] connects Washington, DC and Cumberland, MD.

The Great Allegheny Passage (GAP) [2] connects Cumberland, MD and Pittsburgh, PA:

For maps, I recommend the two available from the Allegheny Trail Alliance (ATA)'s website at:

https://gaptrail.org/explore/printable-maps

Also, there is a mobile app for the C&O Canal Towpath from the C&O Canal Trust (the official nonprofit partner of the C&O Canal National Historical Park)

https://www.canaltrust.org/plan/explorer-mobile-app/

  [1]: https://www.canaltrust.org/plan/co-canal-towpath/
  [2]: https://en.wikipedia.org/wiki/Great_Allegheny_Passage

Thanks so much! When it warms up again I’ll give it a whirl!

The route itself is very easy to follow and well-marked. I did the southern half (C&O), and if you camp along the way using the free sites, you don’t even have to get off the trail except to resupply.

This is a good source for up to date information: https://bikecando.com/forum.aspx.

This is a great resource: http://bikewashington.org/canal/