- "S" Bridges (2)
- 2-panel truss (2)
- 3-panel truss (19)
- 4-panel truss (41)
- 5-panel truss (97)
- 6-panel truss (116)
- 7-panel truss (92)
- 8-panel truss (83)
- 9-panel truss (41)
- 10-panel truss (47)
- 11-panel truss (15)
- 12-panel truss (12)
- 14-panel truss (6)
- 16-panel truss (1)
- 18-panel truss (1)
- Arch (7,564)
- Bailey truss (1)
- Baltimore truss (40)
- Balustrade (1)
- Bascule (439)
- Beam (1,579)
- Bedstead truss (15)
- Bowstring truss (58)
- Brick arch (7)
- Burr arch-truss (123)
- Cable-stayed (22)
- Camelback truss (64)
- Cantilevered truss (118)
- Childs truss (8)
- Closed-spandrel arch (1,114)
- Concrete (1)
- Concrete balustrade (80)
- Concrete girder (46)
- Concrete inset railing (32)
- Concrete pony arch (21)
- Concrete tee beam (119)
- Concrete truss (1)
- Corrugated deck (522)
- Covered (526)
- Culvert (16)
- Curved (26)
- Deck arch (6,658)
- Deck girder (102)
- Deck truss (537)
- Double decker (10)
- Double-intersection Warren truss (17)
- Eyebar suspension (5)
- Ferry (16)
- Footbridge (15)
- Girder (191)
- HAER documented (286)
- Half-hip (20)
- Haupt truss (1)
- Howe truss (91)
- Inclined upper chord (4)
- Inverted bowstring truss (3)
- Kingpost truss (21)
- Laced endposts (9)
- Lannon Stone (26)
- Lattice truss (58)
- Lenticular truss (22)
- Long truss (6)
- MKT Trail (2)
- Milwaukee Movable Bridges (24)
- Movable (858)
- Multiple Kingpost truss (48)
- Mystery (43)
- No guardrails (20)
- Open-spandrel arch (203)
- Over a mile long (94)
- Paddleford truss (4)
- Parker truss (418)
- Partridge truss (5)
- Pegram truss (4)
- Pennsylvania truss (102)
- Pin-connected (436)
- Plate girder (123)
- Polygonal Warren truss (103)
- Pony truss (9,394)
- Post truss (2)
- Pratt pony truss
- Pratt through truss (2)
- Pratt truss (1,432)
- Queenpost truss (38)
- Rail-to-road (14)
- Rail-to-trail (35)
- Railroad overpass (41)
- Rainbow arch (145)
- Recently completely rebuilt. (1)
- Relocated (122)
- Riveted (375)
- Riveted truss (2)
- Self-anchored (3)
- Skewed
- Slab (1)
- Smith truss (16)
- Span length 25-50 feet (6,062)
- Span length 50-75 feet (4,663)
- Span length 75-100 feet (3,262)
- Span length 100-125 feet (2,269)
- Span length 125-175 feet (1,997)
- Span length 175-250 feet (1,000)
- Span length 250-500 feet (576)
- Span length 500-1000 feet (237)
- Span length over 1000 feet (67)
- Span length under 25 feet (2,558)
- Staircase (1)
- State line crossing (148)
- Stearns truss (4)
- Steel arch (263)
- Steel grate deck (355)
- Steel stringer (356)
- Steel through arch (128)
- Stone arch (1,350)
- Stone piers (3)
- Suspension (151)
- Swing (269)
- Thacher truss (2)
- Through girder (68)
- Through truss (5,257)
- Timber pony arch (1)
- Timber stringer (1,012)
- Total length 25-50 feet (5,271)
- Total length 50-75 feet (4,946)
- Total length 75-100 feet (3,331)
- Total length 100-125 feet (2,422)
- Total length 125-175 feet (2,632)
- Total length 175-250 feet (1,786)
- Total length 250-500 feet (2,100)
- Total length 500-1000 feet (999)
- Total length 1000-2500 feet (700)
- Total length over 2500 feet (341)
- Total length under 25 feet (965)
- Truss (15,802)
- Tubular piers (14)
- Tunnel (255)
- Uncovered wooden truss (3)
- Vertical endposts (5)
- Vertical lift (174)
- Vierendeel truss (3)
- Waddell "A" truss (3)
- Warren truss (707)
- Warren-Turner truss (1)
- Whipple truss (52)
- Wooden deck (5,156)
- Wooden railroad overpass (11)
- Wrought iron (8)