Ingham County Michigan
No, this does not look like poison ivy. I have attached a link with good photos that should help. At times, poison ivy does act as a vine and climbs up trees trees with prominent aerial roots. The shape of these leaves is too toothed and the arrangement on the stem isn't what poison ivy looks like either.
Nope, not boxelder either. It is some kind of herbaceous (non-woody plant). it looks like it may have some flower buds developing. If you send in a photo when it is flowering it will be much easier to identify.
Have a look at these pictures once it flowers. I think it may be a wildflower called white avens
I think that you're right. It does look very much like a white avens. I appreciate your help. This is a very helpful service.