87 Fisher Street, Needham, MA gets you close. Picture of the entrance below. Driveway down to the water is on the left next to the bike bath.
This section is called the Bays Region, and is relatively undeveloped except for some large houses as the river flows through Dover/Sherborn. The river starts off as marshland, but turns to woodlands as you get above the Dover Street Bridge. We will stop for lunch at the Elm Bank Reservation – about 11-miles up and back. I scouted it yesterday - a few pictures here:
