The leaves look rather narrow and pointy for some of the elms, and we're also looking at WA which I think is out of range for U. americana? Is it possible to get a picture of a representative leaf or two to check for uneven leaf "shoulders" and a close-up of the leaf edges (margins) to see if they are double-toothed? Detaching leaves and putting them on a sheet of plain white printer paper for the pic helps.
