(KNZA)--A single-vehicle wreck early Saturday evening on a Shawnee County road sent a Valley Falls woman to the hospital with serious injuries.

The Shawnee County Sheriff's Department says 77-year-old Margaret Huertz was traveling on Northeast Calhoun Bluff Road when her car drifted off the north side of the road and crossed both lanes of traffic before hitting a guard rail.  Her car then rolled into a creek.

Deputies responding to the wreck shortly before 5:00 found the car underneath a bridge.

Huertz was taken to a Topeka hospital with what the sheriff's department described as life-threatening injuries.

The wreck remains under investigation.