It could pay off to knock on doors,got a call last sat. from my dad and brothers,they were fishing in Lyman when they saw 30 head and 7 bulls one real masher aparently.Called my brother inlaw he got on them but didnt connect .It is mostly private and hard to gain access.If I knew they were headed for the river then useing a boat to hunt the islands could be a option.Are the islands public well ,I could give some insight on that but Montana could be set up totally different,there they have three classes of a,b,& c.Class a is navigable for commercial use witch means the islands are public,class c means if you drop an ancor in the mud you trespassing and class b well thats a little grey, the land is private but below the high water level mark is accessable in fishing terms.My way of gaining this knowledge was not good.Any ways if you google that area you will see a lot of area in the bottoms the herd often leaves a few straglers down in there and is definatly a hunt option.