(MARLETTE TOWNSHIP) -- Sanilac County Sheriff's deputies were sent to a single-vehicle crash Saturday morning on M-53 near Reynolds Road in Marlette Township. Deputies say that 77-year old Arlean May of Marlette was traveling south along M-53 around 11:40 a.m. when she ran off the roadway, entered the west ditch and struck a tree. The crash caused extensive damage to the vehicle. May was transported by Marlette EMS to Marlette Regional Hospital for treatment of severe injuries. She was later transferred to Covenant Cooper Hospital in Saginaw where she is listed in serious/critical condition. Deputies say alcohol is not believed to be a factor in the crash. Michigan State Police Troopers from the Caro Post, Marlette Police and Marlette Fire assisted at the scene.