The Greeley Tribune reports that Monfort submitted to a breath test and recorded a breath alcohol concentration level of 0.284.
According to an arrest affidavit, Monfort first told police that he had two beers and wouldn't be under the legal limit of 0.08. But then he said he had more than two.
Monfort has apologized for his arrest.
He issued a statement saying he was disappointed in himself for putting other people at risk. He is scheduled to enter a plea in Weld County court on Nov. 19.
