The Brule River splits around a rock outcrop, with one branch plunging into a deep pothole long rumored to swallow the water without an outlet. Hydrologic measurements indicate the water rejoins the river downstream, but the strange geometry still gives the falls its enduring mystery.
Filed under roadside oddities: giant objects, odd monuments and things built for no clear reason.
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Source: dnr.state.mn.us/mcvmagazine/issues/2017/mar-apr/devils-kettle-mystery.html