Crunching the numbers on America's infrastructure...
Crunching the numbers on America's infrastructure...
Why did the bridge go to therapy? It had too many spans of anxiety.
over ST 3 A/CAMBRIDGE ST
AT JUNC. OF I 95 & ST 3A
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This bridge has a Poor overall condition rating of 4 out of 9. This bridge is classified as being in poor condition, meaning one or more structural components have significant deterioration. Poor condition does not mean the bridge is unsafe to drive on, but it does mean repairs or replacement may be needed.
The bridge carries 93,600 vehicles per day and is 76 years old (reconstructed in 1964).
Its sufficiency rating of 51.9 places it below the national average of 63.6.
The NBI records a navigation clearance of 14 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 205 feet long — a short crossing, about 10-15 seconds.
A standard overpass design with solid barriers on each side.
About 14 feet above ground — standard overpass height.
About 93,600 vehicles cross daily — heavy traffic, congestion likely during rush hours.
The deck is 74 feet wide with multiple lanes — easy to stay in a center lane.
This bridge crosses over land, not water — no water views 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
1950
76 years old (rebuilt 1964)
Structure Type
Steel Stringer/Multi-beam/Girder
Total Length
205 ft
62.5 m
Deck Width
74 ft
22.6 m
Spans
3
sections between supports
Max Span
105 ft
longest unsupported section (32.0 m)
Traffic Lanes
4 lanes
One-way traffic
Clearance Below
14 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
93,600vehicles/day
42.48875°N, 71.19172°W
Steel Stringer/Multi-beam/Girder
A steel stringer bridge uses parallel steel beams (stringers) to support the deck. This is one of the most common bridge types in the US, valued for its simplicity and strength.
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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.