Connecting to the Oregon Trail at Wallula, it ran north across Quincy Flats past Moses Lake, then crossed the lower Grand Coulee at present day Coulee City.
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In Washington Territory a wagon road from Wallula (Fort Nez Percés near Walla Walla) to the gold mining regions of British Columbia was known as the "Cariboo Trail" or the "Wallula-Okanogan Road".
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On August 16, 1862, Wright won the contract to build the 47 mile (76 km) long section of the Old Cariboo Road from Lillooet to Cut-Off Valley, which connects from the Fraser River at Pavlion, over Pavilion Mountain via Kelly Lake to Clinton, British Columbia, as "47 Mile House" would become known.He was also given the option to complete the rest of the 151 miles (243 km) of construction to Alexandria, which he also undertook.