The crash happened on Fox River near the Snuggery River Roadhouse restaurant. Police said a pontoon boat missed a sharp turn and hit a guardrail.
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Four people were on the boat, and two were hurt. There's no word on the extent of their injuries.
An ABC7 viewer shared a video, where you can hear the impact of the crash.
The boat's captain was arrested by Illinois Conservation police for careless operation of a watercraft and for operating it under the influence of alcohol.