Utah Code § 17-61-406: Pending civil and criminal actions -- Previous offenses.

(1) All civil and criminal actions that are pending in the territory embraced in a new county at the time the new county is created may be prosecuted to judgment and execution in the new county.

(2) All actions pending in the district court or the juvenile court in any county shall be prosecuted to judgment and execution in the county in which the actions are pending, subject to change of venue as provided by law.

(3) An offense that was committed within the boundaries of a new county before the new county was created may be prosecuted to judgment and execution in the new county.