The Boise County Sheriff's Office says Pearl Sittner, 4, of Boise, was in the SUV with four other family members when it went off the road and slid 90 feet down an embankment before stopping.
The girl's parents were able to get two other children out of the SUV, but were unable to reach Pearl before the SUV broke loose and slid another 60 feet down the embankment into the water.
Officials estimate the SUV sank 40 feet into the water. Divers arrived at the scene and found Pearl still inside the SUV. They brought her to the shore and started CPR, but it was too late.
One of the children, an 8-year-old, was taken by air ambulance to the hospital.
Multiple emergency crews from Ada and Boise Counties were called out Thursday night to help with rescue efforts, including a dive team from the Boise Fire Department.
This is the second child to drown in the reservoir area this week. A 7-year-old Nampa boy drowned on Monday afternoon while camping with his family.
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