Okay, but I am looking for a #. I am trying to do it on a budget too...What is the minimum traps and sizes?
I can appreciate that but without knowing how much fur sign is along the stretch of river you plan to trap it is impossible to give a number.
Most likely you would be trapping muskrats, mink and coon in which case 1.5 coils would be the proper size. Better get a move on. Before you know it mink and muskrat season will be over and once the really cold weather sets in coon movement will be restricted.
Successful traplines are laid out well in advance of the season, supplies are bought and traps prepared. It is neigh unto impossible to do things on the fly during the season without having any real hope of success.