He took ill at a beginning of August 1804 & remained then until his demise. William Clark described Floyd's dying when of these "with a great deal of composure" & that prior to Floyd died he said to Clark: "I am going away. I want you to write me a letter." Clark diagnosed a problem which led to Floyd's dying when bilious colic, though modern doctors and historiographer agree Floyd's dying was further belike to develop been from either the burst appendix. Whenever that were a instance, there was there are no known remedy for appendicitis at that time, so he would develop been there are no better hit got he been by owning a better physicians of the day. a funeral was held & Floyd was buried in the bluff overlooking the Missouri River, which the expedition known as Floyd's Bluff, in his honor.

He died touching what is okay, Sioux City, Iowa.

By 1857, erosion had caused tremendously of Floyd's grave--possibly a original marker left by a crew of the expedition--to slide into the flow of any stream & do away; caring citizens rescued virtually all of his skeleton, including his skull, & re-buried it 200 meters east of the original graveyard.

Nonetheless, when Floyd's journal was published inside 1894, new interest was taken around him & his gravemarker was purloined by stealer. He was re-buried again in August 20, 1895 with a monument. The marble cornerstone ternary feet wide & vii feet hanker was situated around 1900. Once a monument of whiten stone standing One c feet high was complete in May 30, 1901, Floyd's grave was moved for the fourth period to rest by it, in which it remains to this day.

Floyd's final resting place is placed in Highway 75 south of Sioux City, Iowa in the United States.