Idaho Website Statistics

All Bridges

  • Total listed Idaho bridges: 425
  • Bridges with photos: 153 (36.0%)
  • Bridges with Street View: 165 (38.8%)
  • Bridges with GPS coordinates: 421 (99.1%)

  • Total photos: 1,050

Extant Bridges

  • Extant bridges: 333 (78.4% of all)
  • Bridges with photos: 103 (30.9% of extant)
  • Bridges with Street View: 149 (44.7% of extant)
  • Bridges with GPS coordinates: 331 (99.4% of extant)

Lost Bridges

  • Lost bridges: 82 (19.3% of all)
  • Bridges with photos: 47 (57.3% of lost)
  • Bridges with GPS coordinates: 81 (98.8% 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. EIRR - Ririe Bridge (B) (Jefferson County, built 1894, open to traffic)
  5. Ashton-Tetonia Trail - Conant Creek Trestle (Fremont County, built 1894, open to pedestrians)
  6. Wood River Trail - Gimlet Pegram Truss Bridge (Blaine County, built 1894, open to pedestrians)
  7. Nampa Bridge (Canyon County, built 1894, replaced by new bridge)
  8. UP - Grace Pegram Truss Bridge (Caribou County, built 1894, abandoned)
  9. Wood River Trail - Cold Springs Pegram Bridge (Blaine County, built 1894, open to pedestrians)
  10. Idaho-Pacific Highway Caldwell Bridge (Canyon County, built 1894, replaced by new bridge)

By Design

  • Arch: 26 (6.1%)
    • Deck arch: 23 (5.4%)
      • Closed-spandrel arch: 6 (1.4%)
      • Open-spandrel arch: 5 (1.2%)
      • Steel arch: 4 (0.9%)
    • Pony arch: 1 (0.2%)
      • Concrete pony arch: 1 (0.2%)
    • Through arch: 2 (0.5%)
      • Steel through arch: 1 (0.2%)
      • Timber through arch: 1 (0.2%)

  • Beam: 95 (22.4%)
    • Stringer: 60 (14.1%)
      • Concrete stringer: 3 (0.7%)
      • Steel stringer: 11 (2.6%)
      • Timber stringer: 42 (9.9%)
    • Concrete tee beam: 34 (8.0%)

  • Culvert: 1 (0.2%)

  • Rigid frame: 3 (0.7%)
    • Concrete rigid frame: 3 (0.7%)

  • Girder: 26 (6.1%)
    • Deck girder: 21 (4.9%)
      • Concrete deck girder: 4 (0.9%)
      • Deck plate girder: 17 (4.0%)
    • Pony/through girder: 4 (0.9%)
      • Pony/through plate girder: 4 (0.9%)

  • Other: 2 (0.5%)

  • Slab: 4 (0.9%)

  • Suspension: 19 (4.5%)
    • Wire suspension: 18 (4.2%)

  • Truss: 225 (52.9%)
    • Deck truss: 15 (3.5%)
      • Pegram deck truss: 2 (0.5%)
      • Pratt deck truss: 4 (0.9%)
      • Warren deck truss: 2 (0.5%)
    • Modern truss: 1 (0.2%)
      • Modern through truss: 1 (0.2%)
        • Modern bowstring through truss: 1 (0.2%)
    • Pony truss: 71 (16.7%)
      • Bailey pony truss: 2 (0.5%)
      • Howe pony truss: 1 (0.2%)
      • Kingpost pony truss: 1 (0.2%)
      • Polygonal Warren pony truss: 6 (1.4%)
        • Polygonal Warren pony truss with alternating verticals: 1 (0.2%)
      • Pratt pony truss: 9 (2.1%)
      • Half-hip Pratt pony truss: 3 (0.7%)
      • Warren pony truss: 23 (5.4%)
        • Warren pony truss with alternating verticals: 7 (1.6%)
        • Warren pony truss with no verticals: 1 (0.2%)
        • Warren pony truss with all verticals: 3 (0.7%)
    • Through truss: 137 (32.2%)
      • Camelback through truss: 1 (0.2%)
      • Double-intersection Warren through truss: 1 (0.2%)
      • Lattice through truss: 1 (0.2%)
        • Triple-intersection lattice through truss: 1 (0.2%)
      • Parker through truss: 20 (4.7%)
      • Pegram through truss: 9 (2.1%)
      • Pennsylvania through truss: 6 (1.4%)
      • Polygonal Warren through truss: 8 (1.9%)
      • Pratt through truss: 34 (8.0%)
      • Warren through truss: 7 (1.6%)
        • Warren through truss with alternating verticals: 2 (0.5%)
        • Warren through truss with all verticals: 3 (0.7%)
      • Whipple through truss: 3 (0.7%)

  • Tunnel: 17 (4.0%)

  • Unknown: 7 (1.6%)