- "S" Bridges (2)
- 2-panel truss (2)
- 3-panel truss (19)
- 4-panel truss (41)
- 5-panel truss (95)
- 6-panel truss (114)
- 7-panel truss (92)
- 8-panel truss (82)
- 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 (7,553)
- Bailey truss (1)
- Baltimore truss (39)
- Bascule (436)
- Beam (1,554)
- Bedstead truss (15)
- Bowstring truss (55)
- Brick arch (7)
- Burr arch-truss (119)
- Cable-stayed (20)
- Camelback truss (64)
- Cantilevered truss (116)
- Childs truss (8)
- Closed-spandrel arch (1,112)
- Concrete balustrade (77)
- Concrete girder (39)
- Concrete inset railing (32)
- Concrete pony arch (21)
- Concrete tee beam (109)
- Concrete truss (1)
- Corrugated deck (522)
- Covered (504)
- Culvert (15)
- Curved (23)
- Deck arch (6,647)
- Deck girder (91)
- Deck truss (533)
- Double decker (10)
- Double-intersection Warren truss (15)
- Eyebar suspension (5)
- Ferry (16)
- Footbridge (10)
- Girder (174)
- HAER documented (284)
- Half-hip (19)
- Haupt truss (1)
- Howe truss (86)
- Inclined upper chord (4)
- Inverted bowstring truss (3)
- Kiewit (1)
- Kingpost truss (19)
- Laced endposts (9)
- Lannon Stone (24)
- Lattice truss (53)
- Lenticular truss (22)
- Long truss (6)
- MKT Trail (2)
- Movable (859)
- Multiple Kingpost truss (39)
- Mystery (43)
- No guardrails (20)
- Not structurally deficient (1)
- Open-spandrel arch (196)
- Over a mile long (94)
- Paddleford truss (4)
- Parker truss (411)
- Partridge truss (4)
- Pegram truss (3)
- Pennsylvania truss (99)
- Pin-connected (417)
- Plate girder (117)
- Polygonal Warren truss (102)
- Pony truss (9,385)
- Post truss (2)
- Pratt truss (1,400)
- Queenpost truss (35)
- Rail-to-road (13)
- Rail-to-trail (33)
- Railroad overpass (39)
- Rainbow arch (138)
- Recently completely rebuilt. (1)
- Relocated (123)
- Riveted (355)
- Riveted truss (2)
- Self-anchored (3)
- Smith truss (16)
- Span length 25-50 feet (6,042)
- Span length 50-75 feet (4,648)
- Span length 75-100 feet (3,249)
- Span length 100-125 feet (2,258)
- Span length 125-175 feet (1,989)
- Span length 175-250 feet (989)
- Span length 250-500 feet (571)
- Span length 500-1000 feet (234)
- Span length over 1000 feet (65)
- Span length under 25 feet (2,545)
- State line crossing (145)
- Stearns truss (2)
- Steel arch (261)
- Steel grate deck (355)
- Steel stringer (346)
- Steel through arch (128)
- Stone arch (1,350)
- Stone piers (3)
- Suspension (151)
- Swing (265)
- Thacher truss (2)
- Through girder (66)
- Through truss (5,205)
- Timber pony arch (1)
- Timber stringer (1,009)
- Total length 25-50 feet (5,254)
- Total length 50-75 feet (4,935)
- Total length 75-100 feet (3,323)
- Total length 100-125 feet (2,418)
- Total length 125-175 feet (2,626)
- Total length 175-250 feet (1,773)
- Total length 250-500 feet (2,089)
- Total length 500-1000 feet (996)
- Total length 1000-2500 feet (696)
- Total length over 2500 feet (337)
- Total length under 25 feet (959)
- Truss (15,739)
- Tubular piers (14)
- Tunnel (253)
- Uncovered wooden truss (3)
- Union Pacific (1)
- Vertical endposts (5)
- Vertical lift (170)
- Vierendeel truss (3)
- Waddell "A" truss (3)
- Warren truss (693)
- Warren-Turner truss (1)
- Whipple truss (47)
- Wooden deck (5,156)
- Wooden railroad overpass (11)
- Wrought iron (8)