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%)