OSM tag name=Lower Blackburn Grade Bridge matches Lower Blackburn Grade Bridge in these Wikidata fields:
| Bridges completed in 1925 | building=bridge, bridge, man_made=bridge, type=bridge |
| Bridges in Humboldt County, California | building=bridge, bridge, man_made=bridge, type=bridge |
| Concrete bridges in California | building=bridge, bridge, man_made=bridge, type=bridge |
| Former road bridges in the United States | building=bridge, bridge, man_made=bridge, type=bridge |
| National Register of Historic Places in Humboldt County, California | boundary=protected_area, historic |
| Pedestrian bridges in California | building=bridge, bridge, man_made=bridge, type=bridge |
| Road bridges on the National Register of Historic Places in California | boundary=protected_area, historic, man_made=bridge, type=bridge, bridge, building=bridge |
| Through arch bridges in the United States | building=bridge, bridge, man_made=bridge, type=bridge |