The McMillan Plan (formally titled The Report of the Senate Park Commission. The Improvement of the Park System of the District of Columbia) is a comprehensive planning document for the development of the monumental core and the park system of Washington, D.C., the capital of the United States. It was written in 1902 by the Senate Park Commission. The commission is popularly known as the McMillan Commission after its chairman, Senator James McMillan of Michigan.

The McMillan Plan was informed by the urban planning proposals of the City Beautiful movement and while it was not fully implemented, the McMillan Plan continues to influence city redevelopment today. The Victorian landscaping of the National Mall was to be eliminated and replaced with an uncomplicated expanse of grass, narrowing the Mall, and permitting the construction of low, Neoclassical museums and cultural centers along the Mall's east–west axis. The plan proposed constructing significant memorials on the western and southern anchors of the Mall's two axes, reflecting pools on the southern and western ends, and massive granite and marble terraces and arcades around the base of the Washington Monument. The plan also proposed tearing down the existing railroad passenger station on the National Mall and constructing a large new station north of the United States Capitol building.

Additionally, the McMillan Plan contemplated constructing clusters of tall, Neoclassical office buildings around Lafayette Square and the Capitol, as well as an extensive system of neighborhood parks and recreational facilities throughout the city. Major new parkways would connect these parks and link the city to nearby attractions.

Never formally adopted by the United States government, the McMillan Plan was implemented piecemeal in the decades after its release. The location of the Lincoln Memorial, Ulysses S. Grant Memorial, Union Station, and U.S. Department of Agriculture Building are due to the McMillan Plan. Proposals to construct the Arlington Memorial Bridge received a significant boost from the plan as well. The McMillan Plan continues to guide urban planning in and around Washington, D.C., into the 21st century and has become a part of the federal government's official planning policy for the national capital.

Senate Park Commission

Beginning around 1880, a series of articles appeared in local Washington, D.C. and national press, which were highly critical of the mediocre architecture and poor-quality public spaces and accommodations in the District of Columbia. In addition, a highly influential meeting of the American Institute of Architects was held in Washington in December 1900. Not only were the city's shortcomings extensively discussed, but plans were proposed for rectifying them. The plan presented at that meeting by Washington-based architect Paul J. Pelz anticipates several decisions in the eventual McMillan Plan, including the grouping of Congressional office buildings around the Capitol, the development of Federal Triangle, and the location of the National Archives Building.

The Senate Park Commission was formed by the United States Senate on March 8, 1901, to reconcile competing visions for the development of Washington, D.C., and especially the National Mall and nearby areas. McMillan Commission members included architect Daniel Burnham, landscape architect Frederick Law Olmsted Jr., and architect Charles F. McKim. Charles Moore, Senator McMillan's chief aide, became secretary of the commission. Sculptor Augustus Saint-Gaudens joined the commission as its last member in August 1901 at the suggestion of McKim.

The commission members, excluding Saint-Gaudens, who was ill with cancer, and Moore, departed for Europe on June 13, 1901, to tour the continent's great manor homes, gardens, and urban landscapes. By the time the commission returned to the United States on August 1, Moore had become a de facto member of the commission.

Description The commission sponsored a major exhibit about their proposals at the Corcoran Gallery of Art on January 15, 1902, the same day the report was released to the public. President Theodore Roosevelt attended the exhibit's opening. The exhibit was dominated by two vast models of the District of Columbia, one showing it as it existed in 1901 and the other showing the changes proposed by the Senate Park Commission.

Seventy-one of the report's pages discussed proposals for the National Mall, while the remaining 100 pages discussed improvements for the park system in and around the city. The proposals for the National Mall received the greatest attention from the commission and were the most detailed. The proposals for the city's parks, beaches, and recreational facilities (ostensibly the reason for its existence) were treated in more general ways. Scattered throughout the plan were references to streets, boulevards, parkways, and various other connections between District and regional parks and the District and the surrounding cities and undeveloped areas.

The National Mall and the "monumental core"

The report proposed turning the National Mall into the core of the growing city. A cruciform design for the Mall was proposed. The United States Capitol building anchored the east end of the east–west axis and the White House the north end of the north–south axis. In the center was the Washington Monument. The recently completed West Potomac Park would be the anchor for the west end of the east–west axis. The commission suggested the recently authorized Lincoln Memorial be sited in the park while proposing that the Ulysses S. Grant Memorial be moved to a new plaza to be constructed directly west of the Capitol. The recently created East Potomac Park would anchor the southern end of the north–south axis, and be occupied by a vast complex of recreational facilities ("Washington Commons") as well as a possible new memorial (to the Founding Fathers or great inventors, the report suggested). Andrew Jackson Downing's winding Victorian landscape design on the National Mall would be replaced with an open vista of grass flanked by formal rows of trees similar to the landscape design at Vaux-le-Vicomte and the Palace of Versailles in France. The width of the Mall, determined after extensive on-site measurements, would be narrowed to . The north and south sides of the National Mall were to be lined with low public office buildings, museums, and cultural attractions (such as theaters). The plan also suggested constructing a low, Beaux-Arts bridge linking West Potomac Park with Arlington National Cemetery. Around the base of the Washington Monument, new formal gardens and terraces would help frame the monument's base. The Pennsylvania Railroad's Baltimore & Potomac (B&P) Railroad Passenger Terminal, located on the National Mall at what is today New Jersey Avenue NW and Constitution Avenue NW, would be torn down. A new, modern train station with a grand court and massive passenger waiting and service areas would be constructed north of the Capitol. Two new reflecting pools (or "canals") would be constructed on the National Mall. One (cruciform in shape) would extend from West Potomac Park to the Washington Monument. The other would extend from East Potomac Park north to the Washington Monument. The Ellipse would remain open space in order to preserve the vista from the White House south to the Washington Monument and the Potomac River.

The L'Enfant Plan's diagonal streets formed the great boundaries of the city's new "monumental core". Pennsylvania Avenue NW, already an important thoroughfare, formed the northeast boundary linking the Capitol with the White House. The report asked the federal government to tear down the vast slum Murder Bay and replace it with a group of monumental federal office buildings similar to Westminster in London or the Louvre Palace in Paris. Lafayette Square north of the White House would also be razed, and new federal office buildings in the Neoclassical style built there. New York Avenue NW would be extended in a southwesterly direction past the White House to link with the new memorial in West Potomac Park. Maryland Avenue SW, extending from the Capitol to East Potomac Park, would form the southeastern boundary of this new monumental core, while the Potomac River formed the southwestern boundary. The commission suggested that taller federal buildings and museums be constructed in areas not immediately adjacent to the National Mall.

The city park system and parkways

The park system proposed by the McMillan Plan drew heavily on the Metropolitan Park System of Greater Boston (also designed by Olmsted). The commission proposed establishing large numbers of neighborhood parks throughout the city, especially in those areas outside the old "Federal City" boundaries. Public bathing and swimming facilities, gymnasiums, and playgrounds were an integral part of each proposed park, and the commission's report provided extensive drawings of "model parks". The commission's goal was to transform parks from places where the wealthy promenaded for purposes of social mobility into places where the average citizen could reap the advantages of physical exercise while enjoying the moral uplift provided by a natural setting within an urban area. Of critical importance to the commission was developing the Anacostia Flats along the Anacostia River. The flats (like West and East Potomac Parks) had recently been reclaimed by dumping dredged material along the riverbank to eliminate marshes. The commission suggested building roads to provide access to the Anacostia River and constructing a large water park for boating, bathing, swimming, and other uses to draw development to the area.

Linking the more important parks would be a series of parkways, designed to allow citizens in carriages (the automobile not having come into widespread use) to become emotionally refreshed by viewing nature. Parkways were envisioned along the south side of the Potomac River from Arlington National Cemetery down to Mount Vernon, and from West Potomac Park through Rock Creek Park to the National Zoological Park. Another parkway (known as "Fort Drive"), nearly circumferential around the city, would link newly created parks designed to preserve the historic Civil War forts which circled the District of Columbia.

Implementation Implementation of the McMillan Plan was opposed by the powerful Speaker of the House, Joseph Gurney Cannon. Cannon was angry that the Senate had bypassed the House in creating the commission. He was strongly opposed to spending the enormous sums that it would take to complete the plan. Although Moore had implemented a carefully planned public relations campaign to win congressional and public support for the McMillan Plan, it was clear that seeking formal approval of the plan from Congress was out of the question due to Cannon's opposition. Instead, members of the commission worked strenuously to ensure that the plan was not encroached upon while waiting for a more opportune time to seek its implementation. Backers of the plan in Congress regularly called upon commission members to testify before Congress and in public hearings to defend the plan.

One of the most important goals of the McMillan Plan was to demolish the B&P Railroad Passenger Terminal. This proposal had generated widespread support in Congress for years. On May 15, 1902, legislation was passed authorizing the construction of a new Union Station. Although extensive disagreement broke out in the House over reimbursing the Pennsylvania Railroad for the cost of moving its tracks, legislation providing this reimbursement passed in 1903. The terminal was demolished in 1908.