It is has been a while since I was back to Billerica, folks sold the house in the early 90s, still stop by from time to time when I am up that way. I noticed that the pipe line over on the Billerica Chelmsford line is pretty much done in with all the development.
In the 80s you could get all the way out on RT3 and there was a heel of a mud hole, cover a Kawaski 125 to the tank top. Also was some wheeling across Treble Cove Rd from the prison, you could get under RT3 and there were some dune out there, as well as some over on the back of Mill Pond in Chelmsford. Olds stopping grounds.....
PS: I have many hours at Jacks, still a one lane bridge to get over the tracks?