Whats the easiest way to tell how much mink activity there is along a stream that is very rocky making it hard to see many tracks.
You can certainly go out with the theory that mink will be on any waterway so just set them up. In areas with good populations of mink that is probably quite true, so the trappers that suggested this are correct.
But having said that I think that it is not a bad idea to confirm there are mink on a given waterway. I have talked to some very good trappers that cold rolled into an area only to find that they were not going to catch many mink. In the summer months a lot of mink are raised way back in the willy whacks up on feeder streams or in old ponds or bogs that have a lot of feed. Sometimes you can really luck out if you hit these areas early before freeze up. Sometimes they disperse early in the fall but not usually. If the back in area has a lot of groceries many of the mink do not venture near a road until things freeze tight, and sometimes not then.
Finding sign as Newt described is what I look for. For me it is mostly tracks or droppings. Even on rocky streams there will be sand and or mud patches to find track on. Droppings are often left on culverts as mentioned or on rocks near culverts. Also you will find dropping on trees that lean out over or that fall across waterways. They seem to like to find a rock to deposit their droppings even away from roads.
Mink trails? I have never trapped in an area with a high enough population to say you could find trails. I suspect there are such areas
The exception would be one of those back in ponds or swamps I referenced above.
If there are mink on a waterway you can usually find sign, if you take the time to look.
mac