Idaho Website Statistics

All Bridges

  • Total listed Idaho bridges: 367
  • Bridges with photos: 112 (30.5%)
  • Bridges with Street View: 144 (39.2%)
  • Bridges with GPS coordinates: 360 (98.1%)

  • Total photos: 667

Extant Bridges

  • Extant bridges: 305 (83.1% of all)
  • Bridges with photos: 69 (22.6% of extant)
  • Bridges with Street View: 133 (43.6% of extant)
  • Bridges with GPS coordinates: 299 (98.0% of extant)

Lost Bridges

  • Lost bridges: 58 (15.8% of all)
  • Bridges with photos: 30 (51.7% of lost)
  • Bridges with GPS coordinates: 57 (98.3% of lost)

Oldest Listed Bridges

  1. UP - Idaho Falls Bridge (Old) (Bonneville County, built 1879, replaced by new bridge)
  2. BNSF - Lake Pend Oreille Bridge (Bonner County, built 1882, open to traffic)
  3. Broadway Bridge (Old) (Ada County, built 1893, replaced by new bridge)
  4. Wood River Trail - Cold Springs Pegram Bridge (Blaine County, built 1894, open to pedestrians)
  5. Ashton-Tetonia Trail - Conant Creek Trestle (Fremont County, built 1894, open to pedestrians)
  6. UP - Grace Pegram Truss Bridge (Caribou County, built 1894, abandoned)
  7. EIRR - Ririe Bridge (A) (Jefferson County, built 1894, open to traffic)
  8. Nampa Bridge (Canyon County, built 1894, replaced by new bridge)
  9. EIRR - Ririe Bridge (B) (Jefferson County, built 1894, replaced by new bridge)
  10. Idaho-Pacific Highway Caldwell Bridge (Canyon County, built 1894, replaced by new bridge)

By Design

  • Arch: 25 (6.8%)
    • Deck arch: 22 (6.0%)
      • Closed-spandrel arch: 5 (1.4%)
      • Open-spandrel arch: 5 (1.4%)
      • Steel arch: 4 (1.1%)
    • Pony arch: 1 (0.3%)
      • Concrete pony arch: 1 (0.3%)
    • Through arch: 2 (0.5%)
      • Steel through arch: 1 (0.3%)
      • Timber through arch: 1 (0.3%)

  • Beam: 72 (19.6%)
    • Stringer: 50 (13.6%)
      • Concrete stringer: 2 (0.5%)
      • Steel stringer: 7 (1.9%)
      • Timber stringer: 40 (10.9%)
    • Concrete tee beam: 22 (6.0%)

  • Rigid frame: 1 (0.3%)
    • Concrete rigid frame: 1 (0.3%)

  • Girder: 23 (6.3%)
    • Deck girder: 19 (5.2%)
      • Concrete deck girder: 4 (1.1%)
      • Deck plate girder: 15 (4.1%)
    • Pony/through girder: 4 (1.1%)
      • Pony/through plate girder: 4 (1.1%)

  • Other: 1 (0.3%)

  • Suspension: 17 (4.6%)
    • Wire suspension: 16 (4.4%)

  • Truss: 208 (56.7%)
    • Deck truss: 14 (3.8%)
      • Pegram deck truss: 1 (0.3%)
      • Pratt deck truss: 4 (1.1%)
      • Warren deck truss: 2 (0.5%)
    • Pony truss: 63 (17.2%)
      • Bailey pony truss: 2 (0.5%)
      • Howe pony truss: 1 (0.3%)
      • Kingpost pony truss: 1 (0.3%)
      • Polygonal Warren pony truss: 6 (1.6%)
        • Polygonal Warren pony truss with alternating verticals: 1 (0.3%)
      • Pratt pony truss: 7 (1.9%)
      • Half-hip Pratt pony truss: 3 (0.8%)
      • Warren pony truss: 22 (6.0%)
        • Warren pony truss with alternating verticals: 7 (1.9%)
        • Warren pony truss with no verticals: 1 (0.3%)
        • Warren pony truss with all verticals: 3 (0.8%)
    • Through truss: 131 (35.7%)
      • Camelback through truss: 1 (0.3%)
      • Double-intersection Warren through truss: 1 (0.3%)
      • Lattice through truss: 1 (0.3%)
        • Triple-intersection lattice through truss: 1 (0.3%)
      • Parker through truss: 14 (3.8%)
      • Pegram through truss: 6 (1.6%)
      • Pennsylvania through truss: 5 (1.4%)
      • Polygonal Warren through truss: 8 (2.2%)
      • Pratt through truss: 31 (8.4%)
      • Warren through truss: 6 (1.6%)
        • Warren through truss with alternating verticals: 1 (0.3%)
        • Warren through truss with all verticals: 3 (0.8%)
      • Whipple through truss: 3 (0.8%)

  • Tunnel: 17 (4.6%)

  • Unknown: 3 (0.8%)