This map was originally taken from a Rand McNally Atlas c. 1878. It illustrates 19th Century Idaho wagon roads, counties, military outposts, Native American reserves, volcanic fields, stage routes, and emigrant trails. Priest Lake is called Aniksu Lake and the Mullan Wagon Road is labeled.
Mullan's wagon road can ben seen as well as the overland stage route near Boise.

All sizes are approximate.