The difference was that this month's floods, which started in earnest Sept. 12, arose over a period of days, giving most people time to get to safety, Schulz said.
The National Weather Service said between 7 and 18 inches of rain fell over an eight-day span, primarily in Larimer and Boulder counties.
Five of the final six people who were unaccounted for contacted authorities after their names were made public, Schulz said. Investigators found the sixth person after realizing they had been working from an incorrect spelling of his last name.
No official estimate has been released on the cost of the floods, which wiped out 200 miles of state roads and 50 state bridges.
State transportation officials say the road damage will top $100 million. U.S. Sens. Mark Udall and Michael Bennet of Colorado introduced legislation Tuesday to remove a $100 million cap on disaster-related federal assistance for road repairs.
The Federal Emergency Management Agency said it had approved $22.1 million in individual assistance, most of it to help people to repair homes or find temporarily rentals. More than 15,600 people have applied for FEMA relief.
Vice President Joe Biden flew over some of the damage Monday and promised that federal aid won't stop even if a possible shutdown of the federal government occurs.