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Photo courtesy Ron Kurtzer.
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  July 21, 1804. Clark: This Great river being much more rapid than the Missourie forces its Current against the opposit Shore. The Current of this river comes with great velosity roleing its Sands into the Missouri, filling up its Bead & Compelling it to incroach on the S [North] Shore. We found great dificuelty in passing around the Sand at the Mouth of this River. Capt. Lewis and Myself with 6 men in a perogue went up this Great river Platt about 2 [one] Miles, found the Current verry rapid roleing over Sands, passing through different Channels none of them more than five or Six feet deep.
July 27, 1804. Clark: I took one man R. Fields and walked on Shore with a view of examoning Som Mounds on the L. S. of the river those Mounds I found to be of Different hight Shape & Size, Some Composed of sand some earth & Sand the hightest next to the river all of which covered about 200 acres of land, in a circular form. on the Side from the river a low bottom & small Pond.
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