POLK COUNTY, Iowa- A motorcyclist is hospitalized after a crash with a car this morning in Grimes. The Polk County Sheriff's Office says the 25-year old motorcyclist was in the 3100 block of SE Gateway Drive in Grimes, when he collided with a car after 8 o'clock. The Sheriff's Office says the motorcyclist has life-threatening injuries. The driver of the car was not hurt.