You knew this one was coming when I went to SW…
According to Wikipedia:
The memorial is located on P Street SW next to the Washington Channel near Fort Lesley J. McNair. It was designed by Gertrude Vanderbilt Whitney, who won the commission in open competition, and sculpted by John Horrigan from a single piece of red granite furnished from Westerly, RI, by the Henry C. Smalley Granite Co. It was unveiled on May 26, 1931, by Helen Herron Taft, the widow of President Taft.
Originally located at the foot of New Hampshire Avenue, NW in Rock Creek Park along the Potomac River, the monument was removed in 1966 to accommodate the Kennedy Center. The memorial was re-erected without ceremony in 1968 on the south Washington waterfront outside Fort McNair in Washington Channel Park at Fourth and P Streets, SW.