Thursday, 5th. Proceeded down stream about 18 miles.
“Downstream” in this case means northward. They are about to cross, or have already crossed, over into Idaho, but of course this was not yet a state.
The only reason they know where they are or what the names of the rivers are, is that they are still traveling with their trail guide, Thomas Fitzpatrick. However, his job is to lead the missionaries up into Idaho to teach the Flathead Indians. They will soon be parting ways and the Bidwell-Bartleson Party will be on their own.
The Bear River Valley is providing them with good food. Jimmy John, in his journal, records that they caught and killed trout (“a great number”), chub, wild geese, antelope, and a porcupine.