Idaho Falls sits along the Snake River in the Upper Snake River Plain of eastern Idaho, where spring runoff from Yellowstone Plateau and Caribou-Targhee National Forest mountains creates significant flood risk along the Snake River corridor from April through June each year. The city's high-desert continental climate produces cold winters with temperatures frequently dropping below 0°F, causing freeze damage to outdoor pipes, water mains, and crawl space plumbing throughout Bonneville County. Summer afternoon thunderstorms contribute to localized flash flooding in low-lying neighborhoods along Warm Slough and other Snake River-adjacent drainage channels.
High-risk neighborhoods
Lincoln Hills and low-lying neighborhoods east of the Snake River face flood risk during peak snowmelt in April and May, when Palisades Dam upstream releases can raise river levels rapidly. Downtown Idaho Falls properties along the Snake River Greenbelt are exposed to river rises and have experienced periodic flooding during above-average snowpack melt years.