Leg colour unclear (and I cannot clearly recall) Dowagers photographed nearby in very similar lighting show clear yellow legs.
Size seemed larger than Least sandpipers seen a day or two later.
Locally this species is known by the common name: Common Pink Wintergreen.
While the pics may not narrow this down to species sufficiently, with a handle lens I have confirmed the key characteristics of the species including its blunt leaf apices, Costa ending below the apex, growth form, microhabitat (epiphyte on older poplar trees) etc.