Functionally obsolete 

1,700

Structurally deficient 

392

Aluminum, Wrought iron, or Cast iron

15

Concrete

1,489

Concrete continuous

1,676

Prestressed concrete

2,547

Prestressed concrete continuous

985

Steel

997

Steel continuous

227

Wood or Timber

528

Other

1

Building or plaza

1

Highway

8,157

Pedestrian-bicycle

1,888

Railroad

150

Second level (interchange)

24

Third level (interchange)

2

Fourth level (interchange)

2

Other

13

Highway

1,978

Pedestrian-bicycle

31

Railroad

426

Waterway

6,055

Waterway (relief)

168

Other

202

Arch - deck

113

Arch - thru

26

Box beam or Girders - multiple

625

Box beam or Girders - single or spread

170

Channel beam

335

Culvert

512

Frame

192

Girder and Floorbeam system

199

Movable - bascule

13

Movable - lift

33

Movable - swing

5

Orthotropic

2

Segmental box girder

10

Slab

1,445

Stayed girder

5

Stringer / Multi-beam or Girder

3,406

Suspension

5

Tee beam

1,158

Truss - deck

32

Truss - thru

168

Other

11