BOISE COUNTY -- Two motorcyclists crashed into Mores Creek Friday night along State Highway 21.
The Boise County Sheriff's Office says the two were riding with a group of about 10 to 15 motorcyclists, on their way to Idaho City, when two riders went off the highway and down into the creek.
One of the motorcyclists was airlifted to a hospital in critical condition, while the other was taken by ambulance in serious condition.
The Boise County Sheriff's Office says judging by the distance the two traveled from the road into the river, a high rate of speed is likely to blame.
Authorities were able to retrieve one of the motorcycles out of the river, but they have not been able to locate the other one.
The crash is still under investigation.