A bridge's favorite type of music? Heavy metal. Or suspension... it depends.
A bridge's favorite type of music? Heavy metal. Or suspension... it depends.
Did you know? The oldest bridge in the NBI was built in 1697.
over LEHIGH RIVER CORMAN RR
TILGHMAN ST.VIADUCT
Parametric wireframe generated from real NBI dimensions. Drag to rotate, scroll to zoom.
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This bridge has a Fair overall condition rating of 6 out of 9. While it is not classified as structurally deficient, it shows some deterioration that is being monitored.
The bridge carries 17,700 vehicles per day and is 97 years old (reconstructed in 2022).
Its sufficiency rating of 64.7 is above the national average of 63.6.
The NBI records a navigation clearance of 11 feet — the minimum vertical space below the bridge deck. The total height of the bridge structure (including towers, railings, and superstructure) may be higher.
For travelers with bridge anxiety
This bridge may cause some awareness for travelers with bridge anxiety, but has manageable characteristics.
This bridge is 1378 feet long — a moderate crossing, about 30 seconds.
An arch bridge design with some openness to the surroundings.
About 11 feet above ground — standard overpass height.
About 17,700 vehicles cross daily — moderate traffic, some congestion possible.
The deck is 55 feet wide with 3-4 lanes — standard width.
This bridge crosses over water. Focus on the road ahead — the water is far below.
This comfort score is designed to help individuals with bridge anxiety plan their travel. All bridges in the National Bridge Inventory are regularly inspected and deemed safe for travel. This is not medical advice — if you experience severe anxiety, please consult a healthcare professional.
Year Built
1929
97 years old (rebuilt 2022)
Structure Type
Concrete Arch (Deck)
Total Length
1,378 ft
420.0 m
Deck Width
55 ft
16.7 m
Spans
12
sections between supports
Max Span
185 ft
longest unsupported section (56.4 m)
Traffic Lanes
2 lanes
Two-way traffic
Clearance Below
11 ft
navigation clearance under deck
Clearance height compared to familiar objects
Height shown is the navigation clearance below the bridge deck. The total height of the bridge structure (including towers and superstructure) may be higher.
Daily Traffic
17,700vehicles/day
40.61642°N, 75.45944°W
Concrete Arch (Deck)
A concrete arch bridge uses a curved concrete structure to transfer loads through compression. Concrete arches are durable and can be very aesthetically pleasing.
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Data from the National Bridge Inventory (NBI), maintained by the Federal Highway Administration (FHWA).
Data year: 2025. Conditions may have changed since the last inspection.
This information is provided for educational and informational purposes only. It should not be used as the sole basis for any decisions related to bridge safety or transportation planning. Always consult official sources and local authorities for the most current data.