The United States Society on Dams is a professional organization made up of more than 1,300 engineering professionals and firms dedicated to environmentally sustainable dam and levee construction and maintenance. USSD professionals help to create fully 50% of the clean, renewable hydroelectric energy in the U.S., meet the nation's need for clean water for our communities and agriculture, and ensure that the nation's 100,000 miles of levees protects our communities from the ravages of flooding. USSD is the United States representative to ICOLD, an international organization dedicated to environmentally sustainable dam and levee construction and maintenance practices and addressing the world's most serious resource challenge - access to clean water. USSD's Mission - Empower professionals to advance sustainable benefits of dams and levees for society. USSD's Vision - A world where all dams and levees are safe and valued by the communities they serve.