A retaining wall assembly includes a concrete retaining wall including a bore, and a cylindrical tube fixed in the bore and sized to fixedly fit to a culvert pipe. The cylindrical tube includes a tube body and a flange extending radially outward from the tube body, and the flange is embedded in the retaining wall. The cylindrical tube, when fixedly fit inside the culvert pipe, supports a full weight of the retaining wall. A method of installing the retaining wall to the culvert pipe includes providing the retaining wall assembly, fixedly fitting the cylindrical tube to the culvert pipe, and providing only native soil directly below a bottom edge of the retaining wall.