Natural Disaster Risk in Lewiston

Natural Hazard Profile: Lewiston, Idaho

Lewiston, in Nez Perce County, is a city of approximately 37,520 residents situated in the Pacific Northwest. Its semi-arid climate brings dry summers, cold winters, and significant wildfire risk, and in particular a high fire danger period from July through September. These conditions collectively define the natural hazard environment that Lewiston residents and property owners must navigate.

Lewiston's overall natural disaster risk is rated 4.1/10 (Moderate) by FEMA's National Risk Index. Snow avalanche exposure tops the local risk profile, with the area's mountain setting and annual snowfall loading producing regular avalanche cycles on steep slopes. Secondary hazards include wildfire and heat.

Within Idaho, Lewiston's risk is, slightly below the 5.1/10 state average. Nationally, it ranks near the U.S. national average of 4.5/10. FEMA's analysis of Nez Perce County identifies avalanche as the foremost hazard, followed by wildfire and heat. These rankings reflect the relative frequency and severity of each hazard type in the local environment.

With a moderate risk rating, Lewiston residents are well-served by maintaining standard preparedness practices — an emergency supply kit, awareness of local hazard seasonality, and insurance that covers the top local risks. Periodic review of coverage for avalanche is recommended.