Set out before Sunrise a Stiff breeze a head from the East proceeded to the enterance of Tylors river on the S W Side and landed on a Sand bar and Sent out the hunters to kill Some meat, our Stock of meat being now exousted and this the most favourable place to precure a fresh Supply, the hunters returned in 3 hours without haveing killed any thing. they informed me that the bottoms were entirely beaten up and the grass laid flat by the emence number of Buffalow which had been here a Short time past. the deer had left the bottom. they Saw several Buffalow Bulls which they did not think proper to kill as they were unfit for use. here we discover the first Signs of the wild turkey.  at 1 P M we halted in the big bend  and killed a fat buck elk near the river, which was very timely as our meat was entirely exhosted. at 2 P. M we again proceeded on down saw Several Buffalow Bulls on each Side of the river also Some deer of the Common kind.  at 6 P. M. we herd the bellowing of the Buffalow Bulls in the lower Isld. of the Big bend below the Gouge  which induced a belief that there was Some fat Cows, 5 men went out from the 2 Small Canoes which was a little a head, and killed two Cows one Bull and a Calf nether of them wer fat we droped the Perogue & Canoes to the lower part of the Island near to where the buffalow was killed and incamped haveing Come 45 Miles only to day. had the buffalow butched and brought in and divided. My friend Capt Lewis hurt himself very much be takeing a longer walk on the Sand bar in my absence at the buffalow than he had Strength to undergo, which Caused him to remain very unwell all night.
Wednesday 27th August 1806. a fair morning. we Set out eairly and procd. on a Short distance Saw a number of buffaloe halted about one hour to hunt but killed nothing then procd. on passed the mouth of Teton river  and passing round the grand turn or grand bend we killed an Elk and took on board all the meat in the evening we Camped on a large Island which was covd with thin timber and tall grass where we killed 4 out of a large gang [of buffalo] and Saved the best of the meat. the Musqutoes verry troublesome indeed
Wednesday 27th. We again had a pleasant day and embarked early; proceeded on till we came to the upper end of the Great-bend, and there stopped to hunt. As our hunters saw no game, we in a short time continued our voyage round the bend; at the lower end of which we killed an elk. As we were passing an island, we saw a gang of buffaloe feeding on it; when we halted and killed three of them, and encamped on the island for the night. 
David Thompson, to whom McKeehan refers, was a trader and surveyor for the North West Company who made the first detailed maps, based on observation, of many areas of western Canada and the Northwest United States. He visited the Mandan and Hidatsa villages in 1797 and took observations which went into his map of 1798, the one mentioned here. Gass's Great Bend is the Big Bend, or Grand Detour, of the Missouri in South Dakota, where the river makes a loop, a feature appearing on maps before Lewis and Clark. McKeehan has confused it with the presently named Great Bend in North Dakota, where the Missouri turns from a generally easterly to a generally southeasterly course. David Thompson was in the neighborhood of the Great Bend, somewhat below, when he visited the Mandan-Hidatsa villages. He never saw the Big Bend.(back)