Idaho Website Statistics

All Bridges

  • Total listed Idaho bridges: 389
  • Bridges with photos: 133 (34.2%)
  • Bridges with Street View: 153 (39.3%)
  • Bridges with GPS coordinates: 380 (97.7%)

  • Total photos: 781

Extant Bridges

  • Extant bridges: 319 (82.0% of all)
  • Bridges with photos: 77 (24.1% of extant)
  • Bridges with Street View: 142 (44.5% of extant)
  • Bridges with GPS coordinates: 312 (97.8% of extant)

Lost Bridges

  • Lost bridges: 64 (16.5% of all)
  • Bridges with photos: 37 (57.8% of lost)
  • Bridges with GPS coordinates: 63 (98.4% of lost)

Oldest Listed Bridges

  1. UP - Idaho Falls Bridge (Old) (Bonneville County, built 1879, replaced by new bridge)
  2. BG&CM - Clearwater River Bridge (Nez Perce County, built 1885, open to traffic)
  3. Broadway Bridge (Old) (Ada County, built 1893, replaced by new bridge)
  4. UP - Grace Pegram Truss Bridge (Caribou County, built 1894, abandoned)
  5. Idaho-Pacific Highway Caldwell Bridge (Canyon County, built 1894, replaced by new bridge)
  6. Ashton-Tetonia Trail - Conant Creek Trestle (Fremont County, built 1894, open to pedestrians)
  7. EIRR - Ririe Bridge (A) (Jefferson County, built 1894, open to traffic)
  8. EIRR - Ririe Bridge (B) (Jefferson County, built 1894, open to traffic)
  9. Wood River Trail - Gimlet Pegram Truss Bridge (Blaine County, built 1894, abandoned)
  10. Wood River Trail - Cold Springs Pegram Bridge (Blaine County, built 1894, open to pedestrians)

By Design

  • Arch: 25 (6.4%)
    • Deck arch: 22 (5.7%)
      • Closed-spandrel arch: 5 (1.3%)
      • Open-spandrel arch: 5 (1.3%)
      • Steel arch: 4 (1.0%)
    • 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: 81 (20.8%)
    • Stringer: 51 (13.1%)
      • Concrete stringer: 2 (0.5%)
      • Steel stringer: 7 (1.8%)
      • Timber stringer: 41 (10.5%)
    • Concrete tee beam: 29 (7.5%)

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

  • Girder: 25 (6.4%)
    • Deck girder: 20 (5.1%)
      • Concrete deck girder: 4 (1.0%)
      • Deck plate girder: 16 (4.1%)
    • Pony/through girder: 4 (1.0%)
      • Pony/through plate girder: 4 (1.0%)

  • Other: 1 (0.3%)

  • Slab: 3 (0.8%)

  • Suspension: 17 (4.4%)
    • Wire suspension: 16 (4.1%)

  • Truss: 215 (55.3%)
    • Deck truss: 14 (3.6%)
      • Pegram deck truss: 1 (0.3%)
      • Pratt deck truss: 4 (1.0%)
      • Warren deck truss: 2 (0.5%)
    • Modern truss: 1 (0.3%)
      • Modern through truss: 1 (0.3%)
        • Modern bowstring through truss: 1 (0.3%)
    • Pony truss: 63 (16.2%)
      • Bailey pony truss: 2 (0.5%)
      • Howe pony truss: 1 (0.3%)
      • Kingpost pony truss: 1 (0.3%)
      • Polygonal Warren pony truss: 6 (1.5%)
        • Polygonal Warren pony truss with alternating verticals: 1 (0.3%)
      • Pratt pony truss: 7 (1.8%)
      • Half-hip Pratt pony truss: 3 (0.8%)
      • Warren pony truss: 23 (5.9%)
        • Warren pony truss with alternating verticals: 7 (1.8%)
        • Warren pony truss with no verticals: 1 (0.3%)
        • Warren pony truss with all verticals: 3 (0.8%)
    • Through truss: 137 (35.2%)
      • 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 (4.4%)
      • Pegram through truss: 6 (1.5%)
      • Pennsylvania through truss: 5 (1.3%)
      • Polygonal Warren through truss: 8 (2.1%)
      • Pratt through truss: 31 (8.0%)
      • Warren through truss: 6 (1.5%)
        • 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 (4.4%)

  • Unknown: 4 (1.0%)