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South Dakota · Risk Readiness
Before the emergency — maps, tools, and the honest picture of what South Dakota throws at different parts of the state.
See SD hazardsSD hazard profile
South Dakota's open plains produce some of the most dangerous winter conditions in the country. The October 2013 Atlas blizzard was one of the most catastrophic livestock disasters in US history — 75,000 cattle were killed in a single early-season storm that hit before ranchers could move animals to shelter. I-90, I-29, and US-14 close routinely. Spring blizzards are common in April and even May, capable of catching livestock and travelers equally unprepared. Eastern South Dakota sits firmly in Tornado Alley. The state averages about 30 tornadoes per year, concentrated east of the Missouri River. The August 1, 2003 F4 tornado near Manchester caused catastrophic agricultural damage. The June 2003 Kimball tornado caused significant damage. Storm chasers regularly target the Sioux Falls to Aberdeen corridor in late spring and early summer. Tornado season runs May through August. The Missouri River and Big Sioux River both flood significantly. The 2011 Missouri River flood was catastrophic — controlled releases from Gavin's Point Dam inundated communities along the river for months, causing $1.6B in damage across the corridor. The Big Sioux River floods Sioux Falls and Dell Rapids regularly in wet springs. Flash flooding in the Black Hills — where narrow canyons concentrate intense rainfall — killed 238 people in the 1972 Rapid City flood.
Ice accumulation causes prolonged power outages and road closures across the state.
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Occur across most of the state, often embedded in severe thunderstorm lines and tropical systems.
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Flash floods, river flooding, and coastal surge affect low-lying areas and river corridors.
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Dry conditions, wind, and vegetation combine to create serious wildfire risk, particularly in dry seasons.
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Official tools
Enter your address to see your flood zone designation and insurance requirements.
Source: FEMA
Real-time earthquake activity and seismic hazard maps for your region.
Source: USGS
Your property's wildfire exposure score based on vegetation, terrain, and proximity to wildland.
Source: USFS
Real-time river levels and flood stage by county.
Source: USGS WaterWatch
Weekly drought conditions by county.
Source: US Drought Monitor
Water quality guidance for households on private wells.
Source: EPA
Insurance gaps
Standard homeowner's policies in South Dakota exclude flood damage. Flood insurance through the NFIP has a 30-day waiting period — it cannot be purchased when a storm is forecast. Check your declarations page annually to confirm your coverage limits and deductibles.
Not in your standard policy
Flood damage — requires NFIP or private flood policy
Earthquake damage — requires separate endorsement
Sewer & drain backup — requires endorsement ($50–$100/yr)
Landslide / mudflow — generally excluded
Next steps
During an emergency
NC emergency contacts, alert signups, and real-time information.
Local EmergencyGet prepared
Step-by-step actions based on the hazards that apply to South Dakota.
SD Checklists