built in the park in the 1920s. A four-mile-long pedestrian promenade was constructed around the park perimeter in 1935. Pool A pool was first proposed for East Potomac Park in 1927, to be located between the two fieldhouses (which would now serve as bath houses). This effort was a private one, but approved by the city. But no work on the project was made. It wasn't until April 1935 that the federal government approved and provided funding for a pool, and even then construction did not begin until 1936. By this time, a bath house was provided for pool users, so that the fieldhouses could remain dedicated to golf course users. A major flood damaged much of the pool construction work in July 1936, and the pool finally opened on June 4, 1937. At some point in the 1950s, 1960s, or 1970s, the eastern fieldhouse was closed to the public and turned over to the U.S Park Police for use as their District 1 Station. The pool and bath house remained largely as constructed until 1976, when the original concrete pool was removed and replaced with a pool consisting of an aluminum shell encased in fiberglass. The bath house was also replaced at this time. The original 1936 pool deck and underground pool structures remained in place, however. Mission 66 buildings In 1956, the National Park Service (NPS), which owned and supervised operation of East Potomac Park, adopted a strategic plan known as Mission 66. This ten-year strategic plan was designed to bring all NPS facilities nationwide up-to-date, and construct new facilities where needed. Mission 66 proposed building three new structures in East Potomac Park. The first was the headquarters of the NPS' National Capital Region (NCR), constructed in the northern part of the park near the south shoreline and completed in 1963. The second was the headquarters of the United States Park Police (USPP), built adjacent to the NCR Headquarters and completed in 1964. Both buildings were designed by William M. Haussmann, an architect who was chief of the National Capital Office of Design and Construction in the National Park Service. In 1969, a one-story addition containing a cafeteria and training center was added to the north end of the NCR headquarters structure. In 2014, the 1913 lodge and the two fieldhouses were nominated for inclusion on the National Register of Historic Places. The latter buildings were hailed as