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OK, so there are 3 kinds of weasels: Long-tailed, Short-tailed, and Two-legged.
To the OP, habitat ranges a lot. However, all you have to do is locate an area and then you can continue to trap that for a good long time. Similar to mink, they don't congregate and live together but they do live in areas together. Areas to consider are edges of forests near clearcuts. I have a deer stand that requires me to walk through an 8-10 year old burn area with lots of young tamarack and fallen logs. Tons of mice and weasels. I've got a cool picture of one that ran up a tree and barked at me.Also, I wouldn't be afraid to try and trap them around the Tri-Cities. They are a very adaptable critter. I trapped them in the grass draws between wheat fields and around ponds out in scabrock country. Look for their track in the snow. They look like four dime-sized prints in a rough v-shape.Do you have any boxes with rat traps? Don't be worried about getting blood on them, it'll clean right off in cold water. Just be careful about extracting a dead weasel (or marten) from a trap because they can freeze to them.
No ermine here. They stay brown all winter. I did have a number of pictures of them working my cat sets and I use beaver for bait. They don't eat much so I don't really care. Used to catch them occasionally in civet sets but apparently their too light to set off a cage trap.
Also, I wouldn't be afraid to try and trap them around the Tri-Cities. They are a very adaptable critter. I trapped them in the grass draws between wheat fields and around ponds out in scabrock country. Look for their track in the snow. They look like four dime-sized prints in a rough v-shape.