Maryland Website Statistics

All Bridges

  • Total listed Maryland bridges: 626
  • Bridges with photos: 367 (58.6%)
  • Bridges with Street View: 245 (39.1%)
  • Bridges with GPS coordinates: 568 (90.7%)

  • Total photos: 2,582

Extant Bridges

  • Extant bridges: 514 (82.1% of all)
  • Bridges with photos: 289 (56.2% of extant)
  • Bridges with Street View: 225 (43.8% of extant)
  • Bridges with GPS coordinates: 457 (88.9% of extant)

Lost Bridges

  • Lost bridges: 99 (15.8% of all)
  • Bridges with photos: 59 (59.6% of lost)
  • Bridges with GPS coordinates: 98 (99.0% of lost)

Oldest Listed Bridges

  1. Old National Road Monacacy River Bridge (Frederick County, built 1808, replaced by new bridge)
  2. Old York Road Bridge (Baltimore County, built 1809, open to traffic)
  3. Casselman Bridge (Garrett County, built 1813, open to pedestrians)
  4. Wilson's Bridge (Washington County, built 1819, open to pedestrians)
  5. Conowingo Bridge (First) (Harford County, built 1820, replaced by new bridge)
  6. Funkstown Bridge (Washington County, built 1823, open to traffic)
  7. Roxbury Mills Bridge (Washington County, built 1824, open to traffic)
  8. Beaver Creek Bridge (Washington County, built 1824, open to traffic)
  9. Devil's Backbone Bridge (Washington County, built 1824, open to traffic)
  10. B&O - Patterson Viaduct (Howard County, built 1829, abandoned)

By Design

  • Arch: 232 (37.1%)
    • Deck arch: 222 (35.5%)
      • Brick arch: 4 (0.6%)
      • Closed-spandrel arch: 27 (4.3%)
      • Luten arch: 1 (0.2%)
      • Open-spandrel arch: 6 (1.0%)
      • Steel arch: 5 (0.8%)
      • Stone arch: 74 (11.8%)
    • Through arch: 8 (1.3%)
      • Concrete through arch: 1 (0.2%)
      • Steel through arch: 7 (1.1%)

  • Beam: 48 (7.7%)
    • Stringer: 45 (7.2%)
      • Steel stringer: 20 (3.2%)
      • Timber stringer: 22 (3.5%)
    • Concrete tee beam: 2 (0.3%)

  • Culvert: 4 (0.6%)
    • Concrete culvert: 1 (0.2%)
    • Stone culvert: 2 (0.3%)

  • Ferry: 1 (0.2%)

  • Rigid frame: 1 (0.2%)
    • Concrete rigid frame: 1 (0.2%)

  • Girder: 77 (12.3%)
    • Deck girder: 40 (6.4%)
      • Concrete deck girder: 2 (0.3%)
      • Deck plate girder: 33 (5.3%)
    • Pony/through girder: 24 (3.8%)
      • Concrete pony/through girder: 1 (0.2%)
      • Pony/through plate girder: 22 (3.5%)

  • Other: 26 (4.2%)

  • Slab: 1 (0.2%)

  • Suspension: 9 (1.4%)
    • Cable-stayed: 2 (0.3%)
    • Wire suspension: 7 (1.1%)

  • Truss: 177 (28.3%)
    • Deck truss: 19 (3.0%)
      • Pratt deck truss: 2 (0.3%)
      • Warren deck truss: 5 (0.8%)
        • Warren deck truss with alternating verticals: 2 (0.3%)
        • Warren deck truss with all verticals: 3 (0.5%)
      • Wichert deck truss: 1 (0.2%)
    • Modern truss: 3 (0.5%)
      • Modern through truss: 3 (0.5%)
        • Modern bowstring pony truss: 2 (0.3%)
        • Modern polygonal Warren pony truss: 1 (0.2%)
    • Pony truss: 60 (9.6%)
      • Bailey pony truss: 13 (2.1%)
      • Bowstring pony truss: 5 (0.8%)
      • Lane pony truss: 1 (0.2%)
      • Polygonal Warren pony truss: 6 (1.0%)
        • Polygonal Warren pony truss with no verticals: 1 (0.2%)
      • Pratt pony truss: 14 (2.2%)
      • Half-hip Pratt pony truss: 4 (0.6%)
      • Warren pony truss: 12 (1.9%)
        • Warren pony truss with all verticals: 1 (0.2%)
    • Through truss: 95 (15.2%)
      • Baltimore through truss: 7 (1.1%)
      • Bollman through truss: 2 (0.3%)
      • Bowstring through truss: 1 (0.2%)
      • Burr arch-truss: 6 (1.0%)
      • Camelback through truss: 2 (0.3%)
      • Howe through truss: 1 (0.2%)
      • K-Truss through truss: 1 (0.2%)
      • Kingpost through truss: 1 (0.2%)
      • Multiple Kingpost through truss: 3 (0.5%)
      • Parker through truss: 9 (1.4%)
      • Pennsylvania through truss: 2 (0.3%)
      • Pratt through truss: 40 (6.4%)
      • Warren through truss: 5 (0.8%)
      • Whipple through truss: 3 (0.5%)

  • Tunnel: 19 (3.0%)

  • Unknown: 31 (5.0%)