The two 14-year old girls were riding on the same ATV on the Goodwin Siding Road when the driver lost control.
It appears that speed was a factor.
The driver sustained minor injuries, mostly road rash, but the other girl was more seriously injured.
She suffered a possible head injury, neither of them had been wearing a helmet.
The driver used a cell phone to call her dad who then reported the crash.
No word on the condition of the girl who was seriously hurt.