Idaho Website Statistics

All Bridges

  • Total listed Idaho bridges: 227
  • Bridges with photos: 55 (24.2%)
  • Bridges with Street View: 78 (34.4%)
  • Bridges with GPS coordinates: 221 (97.4%)

  • Total photos: 349

Extant Bridges

  • Extant bridges: 190 (83.7% of all)
  • Bridges with photos: 31 (16.3% of extant)
  • Bridges with Street View: 70 (36.8% of extant)
  • Bridges with GPS coordinates: 184 (96.8% of extant)

Lost Bridges

  • Lost bridges: 35 (15.4% of all)
  • Bridges with photos: 19 (54.3% of lost)
  • Bridges with GPS coordinates: 35 (100.0% of lost)

Oldest Listed Bridges

  1. Grace Pegram Truss Railroad Bridge (Caribou County, built 1894, abandoned)
  2. E.I.R.R. - Ririe Bridge (Jefferson County, built 1894, open to traffic)
  3. Gimlet Pegram Truss Railroad Bridge (Blaine County, built 1894, open to pedestrians)
  4. Conant Creek Bridge (Fremont County, built 1894, open to pedestrians)
  5. E.I.R.R. - Ririe Flood Channel Bridge (Jefferson County, built 1894, open to traffic)
  6. Cold Springs Pegram Truss Railroad Bridge (Blaine County, built 1894, open to pedestrians)
  7. E.I.R.R. - Henry's Fork Snake River Bridge (Fremont County, built 1896, open to traffic)
  8. Guffey Railroad Bridge (Owyhee County, built 1897, open to pedestrians)
  9. Last Chance Canal Tunnel & Bridge. (Caribou County, built 1899, unknown status)
  10. CSP Half Moon Trestle (Lewis County, built 1907, closed to all traffic)

By Design

  • Arch: 21 (9.3%)
    • Deck arch: 18 (7.9%)
      • Closed-spandrel arch: 2 (0.9%)
      • Open-spandrel arch: 3 (1.3%)
      • Steel arch: 4 (1.8%)
    • Pony arch: 1 (0.4%)
      • Concrete pony arch: 1 (0.4%)
    • Through arch: 2 (0.9%)
      • Steel through arch: 1 (0.4%)
      • Timber through arch: 1 (0.4%)

  • Beam: 42 (18.5%)
    • Stringer: 36 (15.9%)
      • Steel stringer: 1 (0.4%)
      • Timber stringer: 35 (15.4%)
    • Concrete tee beam: 6 (2.6%)

  • Girder: 3 (1.3%)
    • Deck girder: 3 (1.3%)
      • Concrete deck girder: 2 (0.9%)
      • Deck plate girder: 1 (0.4%)

  • Suspension: 1 (0.4%)
    • Wire suspension: 1 (0.4%)

  • Truss: 158 (69.6%)
    • Deck truss: 10 (4.4%)
      • Pegram deck truss: 1 (0.4%)
      • Pratt deck truss: 3 (1.3%)
    • Pony truss: 43 (18.9%)
      • Howe pony truss: 1 (0.4%)
      • Kingpost pony truss: 1 (0.4%)
      • Polygonal Warren pony truss: 6 (2.6%)
        • Polygonal Warren pony truss with alternating verticals: 1 (0.4%)
      • Pratt pony truss: 4 (1.8%)
      • Half-hip Pratt pony truss: 1 (0.4%)
      • Warren pony truss: 9 (4.0%)
    • Through truss: 105 (46.3%)
      • Camelback through truss: 1 (0.4%)
      • Double-intersection Warren through truss: 1 (0.4%)
      • Lattice through truss: 1 (0.4%)
        • Triple-intersection lattice through truss: 1 (0.4%)
      • Parker through truss: 13 (5.7%)
      • Pegram through truss: 6 (2.6%)
      • Pennsylvania through truss: 2 (0.9%)
      • Polygonal Warren through truss: 8 (3.5%)
      • Pratt through truss: 18 (7.9%)
      • Warren through truss: 4 (1.8%)
        • Warren through truss with alternating verticals: 1 (0.4%)
        • Warren through truss with all verticals: 2 (0.9%)
      • Whipple through truss: 1 (0.4%)

  • Tunnel: 1 (0.4%)

  • Unknown: 1 (0.4%)