Boulder County Health Department spokesperson Chana Goussetis says officials are disappointed that some people appear not to be considering that they could infect others with COVID-19.
"We understand that this is a really difficult time for all of us," Goussetis said. "It's beautiful outside, we all want to finally get out and enjoy. But we're not there yet."
Health officials said they don't know if any of the people on the river have been ticketed for disobeying public health orders, but that they have been in contact with local law enforcement.
One Boulder City Council member, Rachel Friend, expressed her frustration at the photos in a tweet.