By 1843 they had built Fort Bridger on Blacks Fork of the Green River, which became as much an emigrant station as trading post.
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Following the advice of Jim Bridger and local trappers and traders, the expedition followed the Blacks Fork River east, crossed the Green River near the present town of Green River, Wyoming and proceeded east along the Bitter Creek valley, crossing the Red Desert, and skirting the northern side of Elk Mountain across the Laramie Plains.