National Guard troops were using trucks to evacuate the town of Lyons, north of Boulder, on Friday, and Colorado has received federal disaster assistance to help with recovery.
Thus far three people have died and one person is missing in what Colorado Gov. John Hickenlooper categorized as "the largest storm that I can imagine in the state's history."
Weather.com meteorologist Jonathan Erdman shared incredible video of flooding blanketing the streets.
Assistant city manager Shawn Lewis said 7,000 homes were under mandatory evacuation orders. The city opened two emergency shelters for displaced residents, according to the Chicago Tribune.
A dozen major roads in northeastern Colorado remained shut with significant damage from flooding, mudslides, rockfalls, and other debris.
"When you're trying to fight a force like this ... it's pretty much futile," said Mike Seidel, meteorologist for The Weather Channel.
Adrian Carrasquillo is the White House correspondent for BuzzFeed News and is based in Washington, DC.
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