The location of Rattlesnake Bar is closer to present-day Auburn than Folsom, near the location of Goose Flat marked on modern topographical maps of the region. The area was inundated during the creation of Folsom Lake, but the piers and abutments of the Rattlesnake Bar bridge are visible when the water level is low.
Rodi Lee writes: "[The bridge] collapsed in 1954 when an overweight truck filled with manure crossed it. The driver was unhurt. There are newspaper articles about the incident (Auburn Journal, Auburn). There are some photos in the article as well. The bridge abutments show when the the lake water is low. The bridge was upstream of Wild Goose Flats."