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- Google Maps
- Lyn Wilkerson, "American Trails Revisited: Following in the Footsteps of the Western Pioneers," p. 224. 2003. Brief description of the bridge.
- Everett W. Harris, "The Overland Emigrant Trail to California: A Guide to Trail Markers Placed in Western Nevada and the Sierra Nevada Mountains in California by the Nevada Emigrant Trail Marking Committee, Inc," p. 5. 1980. The Callahan Bridge marks the spot where the Applegate - Lassen - Nobles trail left the Humboldt River.
- nevada.usgs.gov/ADR/surfacewater.cfm?site_no=10333000 River flow from 1 mi upstream from Callahan bridge, (realtime data)