FEMA Flood Zone Lookup in South Dakota

South Dakota faces flood risk from the Missouri River, which runs through the center of the state, as well as flash flooding in the Black Hills and along smaller rivers and creeks. The 2011 Missouri River flood was one of the most significant in state history, with releases from upstream dams inundating communities along the river including Pierre, Fort Pierre, and parts of Yankton. The Big Sioux River floods regularly through Sioux Falls, with the 1986 and 2019 events causing significant damage. The Black Hills region faces flash flood risk from steep terrain and narrow canyons, with the 1972 Rapid City flood being the state's deadliest disaster when a wall of water killed 238 people and destroyed much of the city. Rapid City has since invested heavily in flood control along Rapid Creek including channels, detention basins, and open space preservation. The Cheyenne River and White River in western South Dakota also create flood risk during spring snowmelt. The state has approximately 175 NFIP-participating communities with high-risk zones concentrated along the Missouri River corridor and in the Black Hills region. South Dakota's agricultural economy means that flooding impacts extend beyond property damage to crops, livestock, and rural infrastructure.