West Branch Pond Road is blocked for access when approaching from the west, 1.5 miles from the AT. However, from the JoMary gate you can get right to the AT crossing. But, there is a fee (per person) to access these lumber roads and there are several turns and you have to know what you are doing to get in there. See the DeLorme Atlas and combined with my report, it might be clearer.
Using JoMary Lake Campground (showers), I made dayhikes from JoMary Road to West Branch Pond Road. Then to KI Road. Then a dayhike to fully explore the Gulf Hagas from KI Road. Now you can go over to AMC's Little Lyford Camp from KI Road thru the Gulf Hagas making a nice two day extravaganza, if you really want to leisurely explore this area, without backpacking.