Spokesman Dwayne Baird confirmed that the UHP had been notified by the Sevier County Sheriff's Office of the arrest on Dec. 31. Turner was taken into custody in Richfield, at the same law enforcement complex shared by UHP and the sheriff's department.
"Turner was immediately placed on administrative leave. The Highway Patrol will perform an internal review of Trooper Turner's off-duty conduct," Baird said in a statement, referring all further inquiries to Sevier County sheriff's investigators.
Sheriff Nathan Curtis said his deputies were well acquainted with Turner and other troopers assigned to the central Utah region. "You always hate to see something like this," the sheriff said. "But we have a responsibility to protect the public's safety, and that girl, too."
He said Turner was off-duty and responding to a request to come to the UHP/Sevier Sheriff's Office complex when he was arrested.
In a probable-cause statement accompanying the charges against Turner, sheriff's Detective Sgt. Alan Pearson wrote that on Dec. 30, he, another officer and a child welfare worker interviewed the girl at a Sevier County residence. The girl, now 14, told Pearson that Turner had been sexually abusing her since age 6, when he put his hand under her clothing and touched her genitalia.
Similar contact purportedly occurred "on a weekly basis" between 2004 and 2007 at locations in Salina.
The alleged abuse halted in early 2010 but resumed in early 2012, according to charging documents.
Turner made his initial court appearance on Thursday. He is scheduled to return Jan. 15 for a status hearing before Judge Marvin Bagley.