August 10th  –  climbing the mountains this morning one and one-half miles over snow and ice from one to
twenty feet deep brought us to the summit; this is the loftiest peak of the Sierra Nevada Mountains that we
have traveled over. The road is now descending and through heavy timber; also very rough, some few
mountains to climb, but not so bad as some we have passed over. Plenty of good water all along, but no grass.
Thirteen and one-half miles to our encampment, not much grass. Distance fifteen miles.
Archive photo from1868 Union Pacific Rail Road Survey. Glass negative
photograph of a wagon train traveling at the top of Donner Summit.