On their climb up the western slope of Santiam Pass, trains cross the Breitenbush River at numerous points.

As a former SP S4 switches the elevator, the Boise Flyer crosses the Breitenbush River trestle with an Alco PA in the lead. Crossing further upstream is a mixed freight lead by a pair of G9s.

On its way to the summit of Santiam Pass, the Boise Flyer climbs the horseshoe curve that encircles Sisters, OR. It will arrive in Boise by morning.