Public floats near Portsmouth (RI)?

[Dinsdale]

I will soon have my boat in the water at a mooring in front of my house in the Island Park area of Portsmouth. I was asking around about a public float/dock where I could load/unload gear and passengers and everyone had no idea any such thing existed. Marinas appear to be touchy about anyone who doesn't actually rent a slip coming in to dock for even a few minutes. Where I came from in Casco Bay Maine, public floats are pretty common. Any ideas?