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Flash Flood in Larimer County, Colorado

Flash Flood July 20, 2021 · Larimer County, Colorado

4
Deaths
$500K
Damage as recorded

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

A debris flow moved into Black Hollow Gulch and damaged or destroyed several structures including four homes. Four people in one of the homes perished when their residence washed away in the floodwaters.

The wider storm

A deadly debris flow from the Cameron Peak burn area, struck Black Hollow Gulch west of Rustic on CO-14. The debris flow, estimated to be 5 to 8 feet deep, destroyed 6 homes and other structures. Four people were killed when their residence was swept away by the floodwaters. The houses and structures were at the mouth of Black Hollow Canyon on the Poudre River. The debris consisting of small, medium, and large boulders, mud, and entire burned trees flowed down the canyon and destroyed the houses in that area, including the bridge that crossed the Poudre River.

Began near Rustic (40.7013, -105.6496).

Source: NOAA Storm Events Database, event 971685. Narratives are written by the National Weather Service forecast office that issued the report.

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