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Restoration[edit]Using funding from the American Recovery and Reinvestment Act of 2009, the National Park Service reconstructed the Lincoln Memorial Reflecting Pool. The pool's water supply system was updated to eliminate stagnant water by circulating water from the Tidal Basin; the pool was formerly filled using potable water from the city. Paved walking paths were added to the north and south sides of the pool to replace worn grass and to prevent further erosion.^[4] Construction on the 18-month, $30.7 million project began in November 2010. In May 2011, workers began sinking the first of 2,113 wood pilings into a 40-foot deep layer of soft, marshy river clay and some dredged material atop bedrock to support a new pool.^[5] The pool reopened on August 31, 2012. The project was managed by the Louis Berger Group.^[6]