Mono County on the eastern Sierra Nevada is home to the Long Valley Caldera — a supervolcano that last erupted 760000 years ago. The US Geological Survey monitors ongoing volcanic unrest in the caldera. Mammoth Lakes is a popular ski and outdoor recreation destination creating seasonal population surge. The county faces wildfire risk and earthquakes from active Eastern Sierra fault systems. Evacuation from Mammoth Lakes is limited by mountain terrain.
// 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
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// Risk Intelligence
| Threat Score | 6 / 10 Moderate Risk |
| Primary Hazard | Wildfire / Volcanic |
| Secondary Hazard | Earthquake |
| FEMA Flood Zone | Moderate |
| Federally Declared Disasters | 5 |
| Last Major Event | 2021 Caldor Fire Smoke |
| Event Frequency | Annual |
// Emergency Operations
| Emergency Mgmt Phone | (760) 932-7549 |
| Emergency Shelters | 4 designated facilities |
| Evacuation Routes | US-395 CA-120 CA-182 CA-270 |
// County Profile
| County | Mono County CA |
| State | California (CA) |
| Population | 14 |
| Area | 3,044 sq miles |
| FEMA Region | Moderate |
// Other California Counties
Los Angeles County CA
Earthquake / Wildfire
9/10
Critical
Butte County CA
Wildfire / Flooding
9/10
Critical
San Francisco County CA
Earthquake / Tsunami
8/10
High
San Diego County CA
Wildfire / Earthquake
8/10
High
Ventura County CA
Wildfire / Earthquake
8/10
High
San Bernardino County CA
Wildfire / Earthquake
8/10
High