150 Mile House is an unincorporated community of 1,172 people in the Cariboo region of British Columbia. It is located 15 km southeast of Williams Lake on Highway 97. 150 Mile House was an important stop on the Cariboo Wagon Road during the Cariboo Gold Rush. Its name is derived from the distance from Lillooet, which was Mile 0 of the Old C…150 Mile House is an unincorporated community of 1,172 people in the Cariboo region of British Columbia. It is located 15 km southeast of Williams Lake on Highway 97. 150 Mile House was an important stop on the Cariboo Wagon Road during the Cariboo Gold Rush. Its name is derived from the distance from Lillooet, which was Mile 0 of the Old Cariboo Road. It is the junction for roads to the communities of Likely and Horsefly to the northeast.