Website Statistics

All Bridges

Total listed bridges: 44,213
Bridges with photos: 19,571 (44.3%)
Bridges with Street View: 9,878 (22.3%)
Bridges with GPS coordinates: 42,547 (96.2%)
Total photos: 147,929

Extant Bridges

Extant bridges: 32,810 (74.2% of all)
Bridges with photos: 15,368 (46.8% of extant)
Bridges with Street View: 8,873 (27.0% of extant)
Bridges with GPS coordinates: 31,866 (97.1% of extant)

Lost Bridges

Lost bridges: 10,387 (23.5% of all)
Bridges with photos: 3,368 (32.4% of lost)
Bridges with GPS coordinates: 9,808 (94.4% of lost)

By Design

Arch: 9,311 (21.1%)
- Deck arch: 8,594 (19.4%)
  - Brick arch: 32 (0.07%)
  - Closed-spandrel arch: 2,651 (6.0%)
  - Iron arch: 4 (0.009%)
  - Luten arch: 57 (0.1%)
  - Open-spandrel arch: 574 (1.3%)
  - Ribbed closed-spandrel arch: 21 (0.05%)
  - Steel arch: 290 (0.7%)
  - Stone arch: 1,904 (4.3%)
  - Timber arch: 7 (0.02%)
- Pony arch: 42 (0.09%)
  - Concrete pony arch: 34 (0.08%)
  - Timber pony arch: 5 (0.01%)
- Through arch: 338 (0.8%)
  - Concrete through arch: 105 (0.2%)
  - Iron through arch: 1 (0.002%)
  - Marsh arch: 40 (0.09%)
  - Network arch: 2 (0.005%)
  - Steel through arch: 166 (0.4%)
  - Timber through arch: 4 (0.009%)
Beam: 5,322 (12.0%)
- Stringer: 4,125 (9.3%)
  - Concrete stringer: 213 (0.5%)
  - Steel stringer: 2,102 (4.8%)
  - Timber stringer: 1,449 (3.3%)
- Concrete tee beam: 1,051 (2.4%)
Culvert: 383 (0.9%)
- Concrete culvert: 74 (0.2%)
- Stone culvert: 213 (0.5%)
Ferry: 65 (0.1%)
Floating: 14 (0.03%)
- Pontoon: 14 (0.03%)
Rigid frame: 192 (0.4%)
- Concrete rigid frame: 157 (0.4%)
- Steel rigid frame: 23 (0.05%)
Girder: 2,812 (6.4%)
- Deck girder: 1,444 (3.3%)
  - Concrete deck girder: 234 (0.5%)
  - Deck plate girder: 1,131 (2.6%)
- Pony/through girder: 1,019 (2.3%)
  - Concrete pony/through girder: 168 (0.4%)
  - Concrete curved chord through girder: 59 (0.1%)
  - Pony/through plate girder: 760 (1.7%)
Other: 913 (2.1%)
Slab: 608 (1.4%)
Suspension: 332 (0.8%)
- Eyebar suspension: 9 (0.02%)
- Self-anchor suspension: 4 (0.009%)
- Cable-stayed: 50 (0.1%)
- Wire suspension: 250 (0.6%)
Truss: 23,353 (52.8%)
- Bedstead pony truss: 384 (0.9%)
  - Bedstead double-intersection Warren pony truss: 66 (0.1%)
  - Bedstead Pratt pony truss: 239 (0.5%)
  - Bedstead Warren pony truss: 75 (0.2%)
- Deck truss: 868 (2.0%)
  - Deck arch-truss: 1 (0.002%)
  - Bailey deck truss: 15 (0.03%)
  - Baltimore deck truss: 11 (0.02%)
  - Canticrete deck truss: 2 (0.005%)
  - Double-intersection Warren deck truss: 13 (0.03%)
  - Fink deck truss: 3 (0.007%)
  - Howe deck truss: 10 (0.02%)
  - K-deck truss: 1 (0.002%)
  - Lattice deck truss: 11 (0.02%)
  - Lenticular deck truss: 1 (0.002%)
  - Pegram deck truss: 1 (0.002%)
  - Pratt deck truss: 151 (0.3%)
  - Scissors deck truss: 1 (0.002%)
  - Warren deck truss: 299 (0.7%)
    - Warren deck truss with alternating verticals: 6 (0.01%)
    - Warren deck truss with no verticals: 1 (0.002%)
    - Warren deck truss with sub-panels: 2 (0.005%)
    - Warren deck truss with all verticals: 21 (0.05%)
  - Whipple deck truss: 5 (0.01%)
  - Wichert deck truss: 3 (0.007%)
- Half-through truss: 4 (0.009%)
  - Pratt half-through truss: 4 (0.009%)
- Pony truss: 12,524 (28.3%)
  - Bailey pony truss: 61 (0.1%)
  - Miller & Borcherding pony truss: 17 (0.04%)
  - Bowstring pony truss: 119 (0.3%)
  - Double-intersection Warren pony truss: 63 (0.1%)
  - Eiffel pony truss: 1 (0.002%)
  - Howe pony truss: 33 (0.07%)
  - Kingpost pony truss: 51 (0.1%)
  - Lane pony truss: 3 (0.007%)
  - Lattice pony truss: 9 (0.02%)
  - Lenticular pony truss: 33 (0.07%)
  - Parker pony truss: 305 (0.7%)
  - Polygonal Warren pony truss: 427 (1.0%)
    - Polygonal Warren pony truss with alternating verticals: 63 (0.1%)
    - Polygonal Warren pony truss with no verticals: 4 (0.009%)
    - Polygonal Warren pony truss with all verticals: 16 (0.04%)
  - Post pony truss: 2 (0.005%)
  - Pratt pony truss: 1,756 (4.0%)
  - Half-hip Pratt pony truss: 281 (0.6%)
  - Queenpost pony truss: 60 (0.1%)
  - Vierendeel pony truss: 3 (0.007%)
  - Warren pony truss: 1,845 (4.2%)
    - Warren pony truss with alternating verticals: 159 (0.4%)
    - Warren pony truss with no verticals: 18 (0.04%)
    - Warren pony truss with all verticals: 133 (0.3%)
- Through truss: 9,158 (20.7%)
  - Baltimore through truss: 142 (0.3%)
  - Bollman through truss: 3 (0.007%)
  - Bowstring through truss: 87 (0.2%)
  - Brown through truss: 2 (0.005%)
  - Burr arch-truss: 224 (0.5%)
  - Camelback through truss: 222 (0.5%)
  - Childs through truss: 8 (0.02%)
  - Double-intersection Warren through truss: 71 (0.2%)
  - Eiffel through truss: 1 (0.002%)
  - Fink through truss: 3 (0.007%)
  - Hammond through truss: 1 (0.002%)
  - Haupt through truss: 1 (0.002%)
  - Howe through truss: 201 (0.5%)
  - Inverted bowstring through truss: 4 (0.009%)
  - K-Parker through truss: 66 (0.1%)
  - K-Truss through truss: 9 (0.02%)
  - Kingpost through truss: 37 (0.08%)
  - Lattice through truss: 247 (0.6%)
    - Quadrangular lattice through truss: 76 (0.2%)
    - Quintangular lattice through truss: 1 (0.002%)
    - Town lattice truss: 125 (0.3%)
    - Triple-intersection lattice through truss: 15 (0.03%)
  - Lenticular through truss: 20 (0.05%)
  - Lenticular Warren through truss: 2 (0.005%)
  - Long through truss: 20 (0.05%)
  - Multiple Kingpost through truss: 90 (0.2%)
  - Other through truss: 4 (0.009%)
  - Paddleford through truss: 19 (0.04%)
  - Parker through truss: 929 (2.1%)
  - Partridge through truss: 6 (0.01%)
  - Pegram through truss: 11 (0.02%)
  - Pennsylvania through truss: 299 (0.7%)
  - Polygonal Warren through truss: 293 (0.7%)
    - Polygonal Warren through truss with alternating verticals: 19 (0.04%)
    - Polygonal Warren through truss with sub-panels: 7 (0.02%)
    - Polygonal Warren through truss with all verticals: 49 (0.1%)
  - Post through truss: 6 (0.01%)
  - Pratt through truss: 3,083 (7.0%)
  - Queenpost through truss: 91 (0.2%)
  - Smith through truss: 27 (0.06%)
  - Stearns through truss: 2 (0.005%)
  - Thacher through truss: 7 (0.02%)
  - Waddell "A" through truss: 3 (0.007%)
  - Warren through truss: 890 (2.0%)
    - Warren through truss with alternating verticals: 14 (0.03%)
    - Warren through truss with no verticals: 8 (0.02%)
    - Warren through truss with sub-panels: 33 (0.07%)
    - Warren through truss with all verticals: 138 (0.3%)
  - Wheeler through truss: 1 (0.002%)
  - Whipple through truss: 142 (0.3%)
Tunnel: 409 (0.9%)
Unknown: 499 (1.1%)

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