 By the early 1910s, several unpaved roads connected Richland to the Cold Creek Valley and Kennewick via a more westerly crossing of the Yakima River Delta.The Richland–Kennewick section was incorporated into the Inland Empire Highway, a paved cross-state route created by the legislature in 1913.The Yakima Valley section of the Inland Empire Highway, later numbered as State Road 3 and Primary State Highway 3, was incorporated into the national highway system in 1926 as part of US 410 between Yakima and Pasco.