Four people were arrested at their campsite about noon Sunday when Colorado Springs police responded to possible narcotic activity in the 1700 block of East Las Vegas Street.
Paul Knighting, 47, was arrested on suspicion of unlawful distribution of a Schedule II controlled substance.
The three other people had open warrants, felony and misdemeanor.
One suspect tried to run from police but was caught. Another also faces drug-related charges, police said.
The other suspects' identities had not been released.