A turbomachine wheel assembly having slotted flanges includes a turbomachine wheel having a first wheel arm and a second, opposing wheel arm. The first wheel arm includes a first flange having a first radially outer surface and the second wheel arm includes a second flange having a second radially outer surface. The second flange includes a fastener retaining member extending axially outwardly from the second radially outer surface and an opening extending axially through the flange at the fastener retaining member. The fastener retaining member includes at least one wall section extending radially inward from the second radial outer surface.