Boat ramps near Georgetown, MA?

I'm think of buying a fishing boat (Starweld 1600 DC/ Merc60ELPT/EFI)

http://www.riverfrontmarine.com/new_galleria.asp?sid=0992016X7K23K2011J10I25I23JAMQ5355R0&veh=227340&pov=2095804

and I was wondering if anyone knows of a web that lists all the boat ramps I might be able to use in north eastern MA, including saltwater?

Thanks, David

I've been working on a house on the Essex River, in Essex, and there is a launch right on the downtown strip (near the Village Restaurant/Woodman's, etc.) You could put in there and head up towards the ocean for stripers.

http://www.mass.gov/dfwele/pab/pab_facilities.htm