It was a stroke of luck that I stumbled upon the original 1861 map of the Sacramento, Placer & Nevada Railroad (SPNRR) map in the California State Archives. With a digitized version of the original map, I could then compare the constructed rail line to modern roads and Folsom Lake shown on 20th century maps. While the 1861 and modern day maps don’t align perfectly, there are enough similarities to confirm suspicions of the route through the Folsom and Granite Bay areas.
