We found the grass at this place very good, but we could not remain longer. Just as we were starting out, our friends the Carson boys and their party drove up. Their animals had been suffering from want of feed, and were losing strength every day. Their provisions were also running short, and it was yet three hundred and fifty miles to Sutter's Fort, over bad roads. The long, hard journey was not the pleasure trip they had looked for. Some of the company were contrary, and all of them had become, like hundreds of others, much disheartened at the discouraging prospect ahead of them. But we endeavored to put the matter in the best light we could, and rendered them such little assistance as was in our power. We were able, among other things, to contribute from our reduced stock a supply of those two great luxuries on the plains, acid and sugar, which they fully appreciated. And, having found here plenty of good feed for their stock, and seeing that there was no immediate danger of starvation, the spirits of the party were in great degree restored. So we drove off and left them in camp, promising to let them know of our whereabouts in case we got through first. It was a hard road we traveled to-day, fifteen miles without water. We broke a new road across a dried-up lake, having an incrustation like ice. It was either borax or soda or salt, probably some of each. Then we came to the river and went into our night camp.
As a side note, since Margaret mentions their stock of food items here, you might be interested in a cookbook popular in the mid-nineteenth century - Miss Beecher's Domestic Receipt book.
The location below is the approximate August 6 campsite.