Idaho Website Statistics

All Bridges

  • Total listed Idaho bridges: 371
  • Bridges with photos: 116 (31.3%)
  • Bridges with Street View: 145 (39.1%)
  • Bridges with GPS coordinates: 364 (98.1%)

  • Total photos: 679

Extant Bridges

  • Extant bridges: 306 (82.5% of all)
  • Bridges with photos: 78 (25.5% of extant)
  • Bridges with Street View: 134 (43.8% of extant)
  • Bridges with GPS coordinates: 300 (98.0% of extant)

Lost Bridges

  • Lost bridges: 61 (16.4% of all)
  • Bridges with photos: 36 (59.0% of lost)
  • Bridges with GPS coordinates: 60 (98.4% 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. Nampa Bridge (Canyon County, built 1894, replaced by new bridge)
  5. Idaho-Pacific Highway Caldwell Bridge (Canyon County, built 1894, replaced by new bridge)
  6. Wood River Trail - Gimlet Pegram Truss Bridge (Blaine County, built 1894, abandoned)
  7. Ashton-Tetonia Trail - Conant Creek Trestle (Fremont County, built 1894, open to pedestrians)
  8. Wood River Trail - Cold Springs Pegram Bridge (Blaine County, built 1894, open to pedestrians)
  9. UP - Grace Pegram Truss Bridge (Caribou County, built 1894, abandoned)
  10. EIRR - Ririe Bridge (A) (Jefferson County, built 1894, open to traffic)

By Design

  • Arch: 25 (6.7%)
    • Deck arch: 22 (5.9%)
      • Closed-spandrel arch: 5 (1.3%)
      • Open-spandrel arch: 5 (1.3%)
      • 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: 73 (19.7%)
    • Stringer: 50 (13.5%)
      • Concrete stringer: 2 (0.5%)
      • Steel stringer: 7 (1.9%)
      • Timber stringer: 40 (10.8%)
    • Concrete tee beam: 23 (6.2%)

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

  • Girder: 23 (6.2%)
    • Deck girder: 19 (5.1%)
      • Concrete deck girder: 4 (1.1%)
      • Deck plate girder: 15 (4.0%)
    • Pony/through girder: 4 (1.1%)
      • Pony/through plate girder: 4 (1.1%)

  • Other: 1 (0.3%)

  • Suspension: 17 (4.6%)
    • Wire suspension: 16 (4.3%)

  • Truss: 211 (56.9%)
    • 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 (17.0%)
      • 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 (5.9%)
        • 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: 134 (36.1%)
      • 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: 17 (4.6%)
      • Pegram through truss: 6 (1.6%)
      • Pennsylvania through truss: 5 (1.3%)
      • 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%)