RedactedNarrative: Per the Lake County report, unit 1 was traveling under the Route 173 bridge.  While going under the bridge, the passenger stood up in the boat.  Her head hit the bridge and she fell down backward into the seat.  She received a cut to the upper backside of her head.  Antioch rescue treated and transported her to the hospital in Libertyville.  Cause of accident is passenger behavior.  Operator stated his wife failed to recognize the situation of high water due to previous rainfall.