Identifying Creek Trees

There are three large trees left along the creek bank on our property.  One I know is a maple tree.  One I have tentatively identified as a boxelder maple but I'll know for sure when I can see the seeds.  The third one I am sure is yellowwood.  It is identical to pictures I've seen on Google and Wikipedia, my tree identification book has lead to yellowwood five times, and when we cut of a branch to give the herb garden a little more light the heart wood is a bright yellow.  It has white flowers that have a smell almost as beautiful as the lilacs it towers over.