slipway is fine.  I left it.
canoe would be wrong as its not meant to be used where there is a ramp.  It would be appropriate at 172nd on the Hudson River.  I'll check that out.  per the link "For places where a boat (canoe/kayak/stand up paddleboard/row boat/paddle-craft) is carried to and from the water use. It's used for spots without a ramp. "