John from Pittsburgh, PA on 5/21/2020 5:29:52 PM:
Ride with GPS or Strava should have these.
From Ride with GPS:
Export File Formats
Every Ride and Route on Ride with GPS can be downloaded to your computer as a TCX Course, TCX History, FIT Course, GPX Track, CSV, or KML.
I do not know if these will load on your Garmin but I’m guessing yes.
Need to register. Once in, just search for Buffalo to Albany or Erie Canal. There’s quite a few to pick from.
John