D.C. Code § 10-142
The public park authorized and established by § 10-140 shall be a part of the park system of the District of Columbia, defined by § 10-104 and shall be under the control of the Director of the National Park Service, whose duty it shall be, as soon as practicable, to lay out and prepare roadways and bridle paths, to be used for driving and for horseback riding, respectively, and footways for pedestrians; and whose duty it shall also be to make and publish such regulations as he deems necessary and proper for the care and management of the same. Such regulations shall provide for the preservation from injury or spoilation of all timber, animals, or curiosities within said park, and their retention in their natural condition, as nearly as possible.
D.C. Code § 10-142