The design of the upper retaining wall stairway involves the planning and construction of staircases that are integrated into retaining wall structures. This requires careful consideration of structural integrity, stability, accessibility, and aesthetics. Factors such as soil conditions, the height of the retaining wall, and the intended use of the stairway must be taken into account. The design typically involves selecting the appropriate stair geometry, material choices, and construction methods to ensure the stairway is safe and functional.