If you can find an out of sight run upon the banking, ideally under or around the pontoon then set a mk6 fenn or bodygrip within a tunnel, no baiting required, but make sure you restrict the size of the entrances to the tunnel.
Alternatively you can dig in or chain down and cover well a cage trap. Again you may not need to bait but if you do use fresh chicken/fish, there isnt much need in trying to use off food.
Mink are naturaly inquisitive and will check out your tunnel/cage out of interest.
The only thing that maybe an issue is the lack of cover or banking with good runs, although they