The first stairway leading to the summit of Moro Rock was constructed of wood and installed in 1917. This stairway deteriorated significantly by the late 1920s, and was replaced in 1931 by the present Moro Rock Stairway, built by the Civilian Conservation Corps. Unlike the earlier stairway, the new stairway adopted a design policy of blending with the natural surfaces to the greatest extent possible. The 797-foot-long stairway was designed by National Park Service landscape architect Merel S. Sager and engineer Frank Diehl, following natural ledges and crevices. It has 400 steps that lead to the summit of Moro Rock. Changes since the original construction have impaired the integrity of the design.