Dewey County SD in South Dakota faces blizzard / flash flooding risk across its 2,303 square mile area. Timber Lake serves this large north-central South Dakota county on the Cheyenne River. Dewey serves as the county seat and regional emergency coordination hub.
// Preparedness Recommendations
- Evacuation routes inland should be identified in advance.
- Store at least 72 hours of food and water.
- Elevate critical belongings above flood level.
- Have backup power ready in case of grid failure.
// Recommended Supplies
Essential gear for power outages, severe weather, and emergency situations in your area.
- Emergency Food Supplies
- Water Filtration & Storage
- Backup Generator
- Solar Backup Power
* We may earn a commission from qualifying purchases.
// Risk Intelligence
| Threat Score | 6 / 10 Moderate Risk |
| Primary Hazard | Blizzard / Flash Flooding |
| Secondary Hazard | Tornado |
| FEMA Flood Zone | Moderate |
| Federally Declared Disasters | 7 |
| Last Major Event | 2019 Blizzard |
| Event Frequency | Annual |
// Emergency Operations
| Emergency Mgmt Phone | (605) 865-3566 |
| Emergency Shelters | 3 designated facilities |
| Evacuation Routes | State and US highways |
// County Profile
| County | Dewey County SD |
| State | South Dakota (SD) |
| Population | 5 |
| Area | 2,303 sq miles |
| FEMA Region | Moderate |
// Other South Dakota Counties
Hand County SD
Tornado / Blizzard
6/10
Moderate
Brule County SD
Tornado / Blizzard
6/10
Moderate
Lyman County SD
Tornado / Blizzard
6/10
Moderate
Day County SD
Blizzard / Flash Flooding
6/10
Moderate
Spink County SD
Blizzard / Flash Flooding
6/10
Moderate
Minnehaha County SD
Tornado / Severe Storm
6/10
Moderate