Functionally obsolete 

1,604

Structurally deficient 

700

Aluminum, Wrought iron, or Cast iron

11

Concrete

8,298

Concrete continuous

120

Masonry

6

Prestressed concrete

2,451

Prestressed concrete continuous

117

Steel

3,063

Steel continuous

1,063

Wood or Timber

171

Other

2

Building or plaza

3

Highway

14,830

Pedestrian-bicycle

1,482

Railroad

341

Second level (interchange)

4

Third level (interchange)

2

Other

29

Highway

2,179

Pedestrian-bicycle

33

Railroad

799

Waterway

12,108

Waterway (relief)

391

Other

39

Arch - deck

58

Arch - thru

1

Box beam or Girders - multiple

224

Box beam or Girders - single or spread

132

Channel beam

42

Culvert

5,670

Frame

27

Girder and Floorbeam system

69

Mixed types

3

Movable - bascule

2

Movable - swing

1

Slab

1,138

Stayed girder

2

Stringer / Multi-beam or Girder

5,770

Tee beam

2,105

Truss - deck

2

Truss - thru

55

Other

1