The entire area of the Anacostia River and Flats reclaimed and to be reclaimed from the mouth of the river to the District line is made and declared a part of the park system of the District of Columbia and designated Anacostia Park.
D.C. Code § 10-155
Tree nursery: Act of May 7, 1926, 44 Stat. 405, ch. 251, transferred to the jurisdiction of the District of Columbia a certain portion of Anacostia Park for use as a tree nursery.