Beyond Cairo Point, the eastward-turned tip at the bottom of Illinois, the Ohio River poured into the Mississippi, but the collision of the two great rivers only crumpled the surface of the water and spread ripples across the mile-wide confluence between Missouri and Kentucky. It was December 7, 1985. The cold front that had surrounded LUNA with ice that morning had cleared the sky and the sun had raised the temperature a few degrees above freezing. The Lower Mississippi, easily twice the breadth of the Ohio, pulled me toward a breach in the horizon where the umber-hued woodlands hung cantilevered over the river's reflection of clouds.

Photographs by the author

Above the toe of my left boot is a bridge over the Upper Mississippi River; above the right boot is a bridge over the Ohio River. The low land between the bridges is Cairo, Illinois.

I rowed in midstream where the current was the swiftest and to give a wide berth to what was the first of a series of seven dikes, or wing dams, that the chart showed would be coming up on the Kentucky side, the longest reaching two-thirds of a mile from the shore. There were no wing dams on the Ohio, but the Mississippi has thousands of them. The rows of piled boulders set straight out from shore force the current into the navigable channel, speeding it up so that sediment doesn’t settle. I didn’t know what to expect, and before I saw any sign of the first wing dam, I heard a sound like wind rushing through a thicket of aspen. Carried on a breeze blowing upriver, it was clear and crisp, making the dam seem both close and dangerous, but when I passed it, the dam was covered by water so deep that there were no standing waves trailing it, just a patch of sharp-cusped ripples spilling across one another.

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