 The Wenatchee–Pateros section of the wagon road was assigned in 1905 as part of State Road 10, which continued north along the Okanogan River to the Canadian border.Within the next three years, State Road 10 was improved using state funds, including $20,000 ( dollars) allocated to Chelan County for the Wenatchee–Pateros section, particularly the southern stretch through Entiat.By 1915, Chelan County had improved the road surface between Wenatchee and Maple Creek, southwest of the city of Chelan, and the Great Northern Railway had begun negotiations to purchase the highway's right-of-way for a new railroad connecting Wenatchee to Okanogan.