Maryland Website Statistics

All Bridges

Total listed Maryland bridges: 858
Bridges with photos: 608 (70.9%)
Bridges with Street View: 356 (41.5%)
Bridges with GPS coordinates: 856 (99.8%)
Total photos: 3,423

Extant Bridges

Extant bridges: 615 (71.7% of all)
Bridges with photos: 392 (63.7% of extant)
Bridges with Street View: 313 (50.9% of extant)
Bridges with GPS coordinates: 614 (99.8% of extant)

Lost Bridges

Lost bridges: 224 (26.1% of all)
Bridges with photos: 125 (55.8% of lost)
Bridges with GPS coordinates: 223 (99.6% of lost)

Oldest Listed Bridges

Old National Road Monacacy River Bridge (Frederick County, built 1808, replaced by new bridge)
Old York Road Bridge (Baltimore County, built 1809, open to pedestrians)
Middletown Covered Bridge 20-10-15x (Frederick County, built 1809, collapsed)
Casselman Bridge (Garrett County, built 1813, open to pedestrians)
Wilson's Bridge (Washington County, built 1819, open to pedestrians)
Belvidere Covered Bridge (Baltimore, built 1820, removed)
Conowingo Bridge (1820) (Harford County, built 1820, replaced by new bridge)
Price's Ford Bridge (Washington County, built 1822, abandoned)
Funkstown Bridge (Washington County, built 1823, open to traffic)
Beaver Creek Bridge (Washington County, built 1824, open to traffic)

By Design

Arch: 271 (31.6%)
- Deck arch: 261 (30.4%)
  - Brick arch: 4 (0.5%)
  - Closed-spandrel arch: 48 (5.6%)
  - Open-spandrel arch: 8 (0.9%)
  - Steel arch: 6 (0.7%)
  - Stone arch: 95 (11.1%)
- Through arch: 8 (0.9%)
  - Concrete through arch: 1 (0.1%)
  - Steel through arch: 7 (0.8%)
Beam: 92 (10.7%)
- Stringer: 72 (8.4%)
  - Concrete stringer: 4 (0.5%)
  - Steel stringer: 36 (4.2%)
  - Timber stringer: 27 (3.1%)
- Concrete tee beam: 19 (2.2%)
Culvert: 4 (0.5%)
- Concrete culvert: 1 (0.1%)
- Stone culvert: 2 (0.2%)
Ferry: 3 (0.3%)
Rigid frame: 7 (0.8%)
- Concrete rigid frame: 6 (0.7%)
- Steel rigid frame: 1 (0.1%)
Girder: 106 (12.4%)
- Deck girder: 57 (6.6%)
  - Concrete deck girder: 2 (0.2%)
  - Deck plate girder: 50 (5.8%)
- Pony/through girder: 31 (3.6%)
  - Concrete pony/through girder: 2 (0.2%)
  - Pony/through plate girder: 28 (3.3%)
Other: 26 (3.0%)
Slab: 13 (1.5%)
Suspension: 9 (1.0%)
- Cable-stayed: 2 (0.2%)
- Wire suspension: 7 (0.8%)
Truss: 261 (30.4%)
- Deck truss: 26 (3.0%)
  - Howe deck truss: 1 (0.1%)
  - Pratt deck truss: 3 (0.3%)
  - Warren deck truss: 7 (0.8%)
    - Warren deck truss with alternating verticals: 2 (0.2%)
    - Warren deck truss with all verticals: 4 (0.5%)
  - Wichert deck truss: 2 (0.2%)
- Modern truss: 1 (0.1%)
  - Modern pony truss: 1 (0.1%)
    - Modern polygonal Warren pony truss: 1 (0.1%)
- Pony truss: 84 (9.8%)
  - Bailey pony truss: 17 (2.0%)
  - Bowstring pony truss: 9 (1.0%)
  - Lane pony truss: 1 (0.1%)
  - Polygonal Warren pony truss: 6 (0.7%)
    - Polygonal Warren pony truss with no verticals: 1 (0.1%)
  - Pratt pony truss: 18 (2.1%)
  - Half-hip Pratt pony truss: 4 (0.5%)
  - Queenpost pony truss: 1 (0.1%)
  - Warren pony truss: 16 (1.9%)
    - Warren pony truss with alternating verticals: 2 (0.2%)
    - Warren pony truss with all verticals: 1 (0.1%)
- Through truss: 150 (17.5%)
  - Baltimore through truss: 8 (0.9%)
  - Bollman through truss: 6 (0.7%)
  - Bowstring through truss: 1 (0.1%)
  - Burr arch-truss: 17 (2.0%)
  - Camelback through truss: 3 (0.3%)
  - Howe through truss: 3 (0.3%)
  - K-Truss through truss: 1 (0.1%)
  - Kingpost through truss: 1 (0.1%)
  - Multiple Kingpost through truss: 2 (0.2%)
  - Other through truss: 1 (0.1%)
  - Parker through truss: 11 (1.3%)
  - Pennsylvania through truss: 2 (0.2%)
  - Polygonal Warren through truss: 1 (0.1%)
    - Polygonal Warren through truss with alternating verticals: 1 (0.1%)
  - Pratt through truss: 61 (7.1%)
  - Queenpost through truss: 4 (0.5%)
  - Warren through truss: 6 (0.7%)
  - Whipple through truss: 3 (0.3%)
Tunnel: 31 (3.6%)
Unknown: 35 (4.1%)