Analyzing deck conditions, superstructure ratings, and bad puns...
Analyzing deck conditions, superstructure ratings, and bad puns...
What do you call a bridge that tells jokes? A pun-toon bridge.
over ALLEG.RIV. RRS LOCALS
31st Street Bridge
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 5 out of 9. While it is not classified as structurally deficient, it shows some deterioration that is being monitored.
The bridge carries 9,812 vehicles per day and is 98 years old (reconstructed in 2013).
Its sufficiency rating of 58.1 places it below the national average of 63.6.
The NBI records a navigation clearance of 10 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 2729 feet long — a longer crossing, over 1 minute.
An arch bridge design with some openness to the surroundings.
About 10 feet above ground — standard overpass height.
About 9,812 vehicles cross daily — light traffic, a smooth crossing.
The deck is 44 feet wide with 2-3 lanes — moderate 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
1928
98 years old (rebuilt 2013)
Structure Type
Steel Arch (Deck)
Total Length
2,729 ft
831.8 m
Deck Width
44 ft
13.3 m
Spans
3
sections between supports
Max Span
380 ft
longest unsupported section (115.8 m)
Traffic Lanes
2 lanes
Two-way traffic
Clearance Below
10 ft
navigation clearance under deck
Daily Traffic
9,812vehicles/day
40.46461°N, 79.98006°W
Steel Arch (Deck)
A steel arch bridge uses a curved steel structure to carry loads primarily through compression. These bridges are known for their elegant appearance and structural efficiency.
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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.