Including Watertown and Waltham
Pathways are complete on one or both sides of the Charles for almost all of the way from Watertown Square through Newton, Watertown, and Waltham to Commonwealth Avenue in Auburndale.A variety of round trips are possible, as are one-way walks using an MBTA bus in the other direction. Here are four possible routes:
Walk or Bike
2 mile loop
Walk or Bike
7 mile loop
Walk or Bike
12 mile loop
MBTA + Walk
3 miles
More information on the Charles River Path

On this website:
Galen Street to Bridge Street (eastern section)
Bridge Street to Moody Street (western section)
DCR maps: