It then continues east along the Pend Oreille River past a marker for the Seneacquoteen historic site.

[3] It then turns east and northeast along the river through Dover into Sandpoint, where it overlaps US-95.

[1][2] In Boundary County, they continue north and northeast into Bonners Ferry, where they cross the Kootenai River, continue north, and end their overlap near Boundary County Airport.

US-2 then turns east past the airport and continues through Moyie Springs and across the Moyie River before turning southeast along the Kootenai River to the Montana state line, where it exits the state.

In 1946, the highway was extended west to Everett, Washington, with the Idaho section taking its current route.