The checkpoints are being held in an effort to reduce the number of intoxicated and unsafe drivers.
The officers participating in the enforcement have additional training in the recognition of motorists who have had too much to drink or are under the influence of illegal drugs.
In addition to drunk driving and impaired driving, officers will also issue citations for seat belt and other violations.
"Removing intoxicated drivers from our roadways is a high priority for the St. Louis County Police," stated Chief Tim Fitch. "The use of checkpoints has been proven to be an effective method to accomplish this goal."