answers: 1922 and 1923
context: and the relocation of a memorial to Civil War General George G. Meade from the northwest section of Union Square; that memorial now stands near the intersection of Constitution Avenue and Pennsylvania Avenue, NW.) The new pool was designed to serve as a counterpart to the one at the western end of the Mall, between the Lincoln Memorial and the Washington Monument. Since its completion in 1971, it has been a popular attraction. The broad, gently sloped limestone coping and the steps that lead down from ground level afford seating for visitors as they enjoy the reflections of the Capitol, </s> on the east, the "Ulysses S. Grant Memorial"; to its west is a tree-dotted grassy area that extends to Third Streets, NW and SW. Nearby tourist destinations include the Capitol, the U.S. Botanic Garden, and the museums and galleries along the Mall. The Capitol Reflecting Pool was included in master plans for the Washington Mall area prepared by the architectural firm of Skidmore, Owings, and Merrill in the 1960s and '70s to reduce vehicular traffic on the Mall and facilitate pedestrian and recreational use. (Other elements of the plan were the creation of the Third Street tunnel under the Mall </s> the Lincoln Memorial, the Mall's trees, and/or the expansive sky. The Lincoln Memorial Reflecting Pool was designed by Henry Bacon, and was constructed in 1922 and 1923, following the dedication of the Lincoln Memorial. It is approximately long (over a third of a mile) and wide. The perimeter of the pool is therefore , about 0.83 miles around. It has a depth of approximately on the sides and in the center. It holds approximately 6,750,000 U.S. gallons (25,500,000 L) of water. Using funding from the American Recovery and Reinvestment Act of 2009, the National Park Service reconstructed the Lincoln Memorial
question: when was the reflecting pool in washington dc built