Earlier Monday, CNN reported that there were two others presumed dead -- a 60-year-old woman and an 80-year-old woman, both in Larimer County. As of late Monday afternoon, it was unclear whether those people were indeed among those officially counted as fatalities by emergency management.
The flooding has washed out or damaged dozens of roads, damaged nearly 18,000 homes and destroyed 1,500 homes, according to the state. Larimer County Sheriff's Office Executive Officer Nick Christensen said Monday that 1,500 homes may have been destroyed in his county, but it wasn't clear if that number was in addition to the state figure.
He also said some 200 businesses may have been destroyed, with 500 damaged in what was a once-in-a-1,000-years flood in some parts of Larimer County.
Boulder County alone will need an estimated $150 million to repair 100 to 150 miles of roadway and 20 to 30 bridges, county transportation director George Gerstle said. The repair bill will be "10 to 15 times our annual budget," he said.
Adding to what is already an unpleasant experience for thousands, residents who have been able to remain in their homes in some towns have been ordered to limit water use and to not flush toilets to avoid sewer backups and other problems. The latest town to issue such an order was Sterling on Monday.
In Firestone, some residents were having to rely on bottled water after two of the city's three water supply lines were destroyed in the flooding, a police department spokeswoman said.
Boulder Mayor Matthew Appelbaum told CNN's "New Day" on Monday that the city will be dealing with the aftermath of flooding for years to come.
"There is a huge amount of damage and a huge amount of repair and a huge amount of cleanup around town that people will be dealing with for a long time," he said.
President Barack Obama signed a major disaster declaration for Colorado on Sunday and ordered federal aid to supplement state and local recovery efforts in Boulder County.
Colorado Gov. John Hickenlooper said he spoke by phone with U.S. Transportation Secretary Anthony Foxx, who "was adamant that the $5 million that was released Friday was just the beginning" of federal assistance.
At a news conference Monday, Hickenlooper said efforts continued to be focused on "search and recovery."
The situation is "surreal," CNN iReporter Erich Toll said.
"I have never seen anything like it," Toll said Sunday. "There are raging rivers in many places where there have never been rivers -- or even water -- before. There are huge swaths of boulder fields where there used to be parks."
Matthew O'Rourke, an iReporter, said he's fearful of Coal Creek in Lafayette, which threatened to take out his business as it overflowed.
"The currents in the river -- they are impossible to describe how violent and diverse and angry they were and are right now," he said Sunday. "There is no way any human could survive if they were swept into this."