The project for flood damage reduction, American and Sacramento Rivers, California, authorized by section 101(a)(1) of the Water Resources Development Act of 1996 (Public Law 104–303; 110 Stat. 3662; 113 Stat. 319; 117 Stat. 1839; 121 Stat. 1947), is modified to authorize the Secretary of the Army, acting through the Chief of Engineers, to construct improvements to flood damage reduction facilities adjacent to the American and Sacramento Rivers in the vicinity of Sacramento, California, substantially in accordance with the report of the Chief of Engineers entitled “American River Watershed (Common Features) Project, Natomas Basin, Sacramento and Sutter Counties, California”, and dated December 30, 2010, at an estimated total cost of $1,389,500,000, with an estimated Federal cost of $921,200,000 and an estimated non-Federal cost of $468,300,000.