Is a little more than one mile walking distance ....... about 1 1/4-miles.
Is not the easiest or safest place to be walking, from the town docks all the way up to Twin Barns. There's no sidewalk up above Mill St, about 1/3 of the way along, so you is walking up a very busy Route-3, sharing the shoulder side of the road with fast moving cars, big trucks, and motorcycles ..... all usually in a rush to get through that stretch of road to beat the lights.
Having said that, if you really want to walk it, it is doable but not too safe.
I would fuhgitabout walking it ..... and go hit
www.giuseppesnh.com Italian restaurant across from the town docks and behind the big waterfall in Mill Falls market place.