Iowa Website Statistics

All Bridges

  • Total listed Iowa bridges: 3,462
  • Bridges with photos: 1,204 (34.8%)
  • Bridges with Street View: 332 (9.6%)
  • Bridges with GPS coordinates: 3,432 (99.1%)

  • Total photos: 9,885

Extant Bridges

  • Extant bridges: 2,330 (67.3% of all)
  • Bridges with photos: 783 (33.6% of extant)
  • Bridges with Street View: 296 (12.7% of extant)
  • Bridges with GPS coordinates: 2,321 (99.6% of extant)

Lost Bridges

  • Lost bridges: 1,057 (30.5% of all)
  • Bridges with photos: 249 (23.6% of lost)
  • Bridges with GPS coordinates: 1,040 (98.4% of lost)

Oldest Listed Bridges

  1. IANR Bear Creek Bridge #2 (Benton County, built 11897, open to traffic)
  2. Eldon Railroad Bridge (older) (Wapello County, built 1859, replaced by new bridge)
  3. Burlington Street Bridge (Johnson County, built 1860, replaced by new bridge)
  4. Raccoon River Covered Bridge (Polk County, built 1862, replaced by new bridge)
  5. CNW Mississippi River Bridge (Clinton, West Channel) (Clinton County, built 1865, replaced by new bridge)
  6. Walnut Street Bridge (Oldest) (Polk County, built 1866, replaced by new bridge)
  7. IC Iowa River Bridge (Hardin County, built 1868, replaced by new bridge)
  8. Delta Bridge (Keokuk County, built 1869, destroyed by fire)
  9. Imes Covered Bridge (Madison County, built 1870, open to pedestrians)
  10. Liberty Trail Bridge (Buchanan County, built 1870, open to pedestrians)

By Design

  • Arch: 270 (7.8%)
    • Deck arch: 197 (5.7%)
      • Brick arch: 1 (0.03%)
      • Closed-spandrel arch: 122 (3.5%)
      • Luten arch: 8 (0.2%)
      • Open-spandrel arch: 20 (0.6%)
      • Stone arch: 39 (1.1%)
    • Pony arch: 2 (0.06%)
      • Concrete pony arch: 1 (0.03%)
    • Through arch: 26 (0.8%)
      • Concrete through arch: 3 (0.09%)
      • Marsh arch: 14 (0.4%)
      • Steel through arch: 9 (0.3%)

  • Beam: 242 (7.0%)
    • Stringer: 235 (6.8%)
      • Concrete stringer: 6 (0.2%)
      • Steel stringer: 134 (3.9%)
      • Timber stringer: 78 (2.3%)
    • Concrete tee beam: 5 (0.1%)

  • Culvert: 23 (0.7%)
    • Concrete culvert: 8 (0.2%)
    • Stone culvert: 12 (0.3%)

  • Floating: 2 (0.06%)
    • Pontoon: 2 (0.06%)

  • Rigid frame: 11 (0.3%)
    • Concrete rigid frame: 10 (0.3%)

  • Girder: 368 (10.6%)
    • Deck girder: 222 (6.4%)
      • Concrete deck girder: 15 (0.4%)
      • Deck plate girder: 202 (5.8%)
    • Pony/through girder: 139 (4.0%)
      • Concrete pony/through girder: 5 (0.1%)
      • Pony/through plate girder: 131 (3.8%)

  • Other: 14 (0.4%)

  • Slab: 14 (0.4%)

  • Suspension: 16 (0.5%)
    • Cable-stayed: 2 (0.06%)
    • Wire suspension: 13 (0.4%)

  • Truss: 2,454 (70.9%)
    • Bedstead pony truss: 8 (0.2%)
      • Bedstead double-intersection Warren pony truss: 1 (0.03%)
      • Bedstead Pratt pony truss: 6 (0.2%)
      • Bedstead Warren pony truss: 1 (0.03%)
    • Deck truss: 28 (0.8%)
      • Baltimore deck truss: 2 (0.06%)
      • Double-intersection Warren deck truss: 1 (0.03%)
      • Howe deck truss: 1 (0.03%)
      • Lattice deck truss: 1 (0.03%)
      • Pratt deck truss: 10 (0.3%)
      • Warren deck truss: 10 (0.3%)
        • Warren deck truss with sub-panels: 1 (0.03%)
        • Warren deck truss with all verticals: 1 (0.03%)
    • Half-through truss: 1 (0.03%)
      • Pratt half-through truss: 1 (0.03%)
    • Pony truss: 1,593 (46.0%)
      • Bowstring pony truss: 22 (0.6%)
      • Double-intersection Warren pony truss: 7 (0.2%)
      • Howe pony truss: 3 (0.09%)
      • Kingpost pony truss: 6 (0.2%)
      • Parker pony truss: 1 (0.03%)
      • Polygonal Warren pony truss: 4 (0.1%)
        • Polygonal Warren pony truss with all verticals: 3 (0.09%)
      • Pratt pony truss: 72 (2.1%)
      • Half-hip Pratt pony truss: 9 (0.3%)
      • Queenpost pony truss: 6 (0.2%)
      • Warren pony truss: 153 (4.4%)
        • Warren pony truss with alternating verticals: 14 (0.4%)
        • Warren pony truss with no verticals: 2 (0.06%)
        • Warren pony truss with all verticals: 77 (2.2%)
    • Through truss: 818 (23.6%)
      • Baltimore through truss: 8 (0.2%)
      • Bollman through truss: 1 (0.03%)
      • Bowstring through truss: 26 (0.8%)
      • Burr arch-truss: 1 (0.03%)
      • Camelback through truss: 9 (0.3%)
      • Double-intersection Warren through truss: 2 (0.06%)
      • Howe through truss: 3 (0.09%)
      • Lattice through truss: 34 (1.0%)
        • Quadrangular lattice through truss: 16 (0.5%)
        • Town lattice truss: 8 (0.2%)
      • Other through truss: 1 (0.03%)
      • Parker through truss: 37 (1.1%)
      • Pennsylvania through truss: 19 (0.5%)
      • Polygonal Warren through truss: 5 (0.1%)
        • Polygonal Warren through truss with sub-panels: 1 (0.03%)
      • Pratt through truss: 293 (8.5%)
      • Thacher through truss: 2 (0.06%)
      • Warren through truss: 38 (1.1%)
        • Warren through truss with alternating verticals: 1 (0.03%)
        • Warren through truss with sub-panels: 6 (0.2%)
        • Warren through truss with all verticals: 8 (0.2%)
      • Whipple through truss: 14 (0.4%)

  • Tunnel: 3 (0.09%)

  • Unknown: 45 (1.3%)