At approximately 1253 hours I arrived at 6 mile cove within Lake Mead NRA. I made contact with operator of vessel #1(V1) and operator of vessel #2 (V2).  (V1) stated that the victim was on his vessel when (V2) struck them. V2 stated she was on the port side of (V1). V1 advised the juvenile victim (JV1) hit her head on the cross beam of his vessel. The injury was sustained during a permitted Sail boat race.
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