The Hood River County Sheriff’s Office is investigating a sexual assault on the Indian Creek Trail.  The Sheriff’s Office says at about 10 a.m. Wednesday a female Hood River Valley High School student reported that she was the victim of a sexual assault on an area of the trail near the school.  The attacker is described as a white male in his late 30’s with light brown hair and a medium to slender build.   He is reported to have stubble facial hair and was wearing a blue athletic shirt with tan cargo shorts.  The victim was alone and did not know her attacker.  The Sheriff’s Department says an extensive ground and air search was conducted, but no suspect was identified.  Sheriff’s detectives are continuing to investigate.  Anyone who may have information regarding this incident is asked to contact the Sheriff’s Office Tip Line at 541-387-7077.