ANCHORAGE, Alaska -

STORY UPDATED AT 5:12 p.m. at 6/15/13:

Alaska State Troopers identified the rider injured in a single-motorcycle crash that temporarily closed the Old Glenn Hwy Friday afternoon.

Troopers said that Kirk Leonard Jacobsen rode his 1999 Harley-Davidson motorcycle without a helmet, heading southbound and was passing other drivers south near Mile 12 of the Old Glenn Hwy.

Troopers wrote in a Saturday morning dispatch that, “Jacobsen's motorcycle entered onto the right shoulder of the road, traveled down the ditch and traveled into some bushes lining the ATV trail where the motorcycle flipped over, pinning Jacobsen beneath.”

Medics transported him to Alaska Regional Hospital in Anchorage where he was treated for non-life threatening injuries.

Editor's Note: KTUU's Neil Torquiano contributed to an update of this story.

STORY UPDATED AT 4:35 p.m. at 6/14/13:

Alaska State Troopers are responding to a single-motorcycle crash which left the rider seriously injured and closed the Old Glenn Highway Friday afternoon.

AST spokesperson Beth Ipsen says troopers first received reports of the wreck, at the Old Glenn’s intersection with Bodenburg Loop, just before 4 p.m. Friday. Responding troopers have closed the highway to allow an air ambulance to land at the scene, so he can be taken to an area hospital.

“The man is going to be flown out of there,” Ipsen said. “The road is going to be closed -- we just don’t know for how long.”

Ipsen says the duration of the closure depends in part on the severity of the man’s injuries, and the extent of troopers’ subsequent investigation of the crash.

Contact Chris Klint