D1  was closed when this agency, created in 1916, petitioned to allow climbing
D1 (Longs Peak):  In 1954, when National Park Service was petitioned to allow climbing on The Diamond they responded with an official closure. National Park Service:  It was created on August 25, 1916, by Congress through the National Park Service Organic Act and is an agency of the United States Department of the Interior.
i don't know