Unusual river find

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Picked this up on the river after the big flooding, I usually find bison but this seems too slender to be bison. I put a cow/bison tibia next to it for comparison. I know it’s not a fossil but if I posted on other sites i know id hear human over and over. I thought maybe horse but looking at my comparative book horse tibia are more beefy than a cow. Elk maybe? Some Pleistocene fauna? It’s heavy ish but it’s not fossilized 

[older the better]

[older the better]

[Osteobyte]

Elk looks like a good match. Particularly the presence of the distal anterior tubercle listed as feature 'J' in the below figure.

From Christopher L. Brown & Carl E. Gustafson: A Key to Postcranial Skeletal Remains of Cattle/Bison, Elk, and Horse.

 

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I agree elk fits nicely, thanks for the info... now to see when elk were last present in se Kansas