Here is another SP&S “airplane” or relief map of its route, this one from 1931 and, like yesterday’s, specifically designed to serve westbound travelers. Other than the cover photo, there are few differences between the two maps: the name Empire Builder has been substituted for Oriental Limited, and the names of some of SP&S’s agents have changed, but that seems to be about it.
The colorful relief map is dated 1916, though it has some notations that postdate that such as the Astoria Column, which was constructed in 1926. The map also shows the SP&S/Oregon Trunk route up the Deschutes River from Wishram as far as Maupin, Oregon, about 90 miles short of its terminus at Bend. It also shows the locations of Lewis & Clark camps along the Columbia River during their fall, 1805 journey to the coast and spring, 1806, return trip.