Bike path @Bridge Street in Watertown

[keram]

Going eastbound I've been taking the bikepath at the park off the Bridge Street Watertown/Newton line for some time but westbound I need to pick Watertown Street (rt16). Today I went past the Bridge Street and found a new path that's being build. Right at the enterance there's a note that this place is being worked on (signed MDC). I still took it and it went for maybe 1/2 - 1 mile or so. At some point it ended and I had to take a street (North Street?) that eventually lead back to to the Watertown Street (rt 16).

Does anyone know if this new path goes further west towards Waltham?