How intense rains in the Grand Canyon became a deadly disaster

The Grand Canyon’s steep walls turned torrential rain into a fast-moving surge of water and debris that killed at least two people and left 15 others missing or unaccounted for. The flood struck the Bright Angel Creek area on Saturday, during the region’s summer monsoon season.

Flash floods are a recurring danger in the canyon from June through September. Narrow rock formations can fill quickly, while the canyon’s terrain funnels runoff into powerful flows. Clear summer weather can change rapidly into thunderstorms and heavy rain.

This storm also crossed part of the Dragon Bravo wildfire’s burn scar. The blaze tore across nearly 150,000 acres, or 60,700 hectares, in July 2025 and destroyed the historic Grand Canyon Lodge. Burned slopes can shed water faster, particularly where intense fires have stripped away vegetation.

The direct role of the wildfire damage in Saturday’s disaster remains unclear. But federal assessments had projected that runoff risks upstream of Phantom Creek would rise between two and eight times. The assessment also warned of hazardous rockfall and unstable trails for at least the first year after the fire.

Park officials had reportedly worried earlier in the summer that stronger storms could create dangerous conditions around the burned areas. Hikers evacuated by helicopter told the Arizona Republic that Bright Angel Creek turned black as it filled with runoff, while floodwaters swallowed bridges and other infrastructure. Scientists have long warned that climate change will bring more intense extremes and sharper shifts between wet and dry conditions.