Urges parties to 1954 U.S. Supreme Court Decree to address ongoing risk of Delaware River Basin flooding.

ACR 51 is a non-binding resolution urging New Jersey, New York, Pennsylvania, and Delaware to ask the U.S. Supreme Court to amend a 1954 decree. The resolution seeks to require New York City to maintain year-round "voids" (empty space) in its reservoirs, rather than filling them to 105% capacity during May 1-June 15 (a historically flood-prone period). This would aim to reduce flooding risks for nearly 2 million New Jersey residents living downstream, as historical floods (like those in 2004-2006) occurred when NYC reservoirs were near capacity. A 2007 study cited in the resolution found that 20% year-round voids could have prevented flooding at 214 structures in towns like Trenton and Ewing.