Why did the truss bridge break up with the beam bridge? It needed more support.
Why did the truss bridge break up with the beam bridge? It needed more support.
Over 5 billion bridge crossings happen every single day in America.
over WATER CHARLES RIVER
.1 MI NW OF NASHUA ST
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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 27,554 vehicles per day and is 116 years old (reconstructed in 2011).
Its sufficiency rating of 62.3 places it below the national average of 63.6.
The NBI records a navigation clearance of 15 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 91 feet long — a quick crossing, under 5 seconds at highway speed.
A movable bridge — it may occasionally stop for boat traffic.
About 15 feet above ground — standard overpass height.
About 27,554 vehicles cross daily — moderate traffic, some congestion possible.
The deck is 84 feet wide with multiple lanes — easy to stay in a center lane.
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
1910
116 years old (rebuilt 2011)
Structure Type
Steel Movable (Bascule)
Total Length
91 ft
27.7 m
Deck Width
84 ft
25.7 m
Spans
1
sections between supports
Max Span
63 ft
longest unsupported section (19.2 m)
Traffic Lanes
5 lanes
Two-way traffic
Clearance Below
15 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
27,554vehicles/day
42.36715°N, 71.06911°W
Steel Movable (Bascule)
A movable bridge can change position to allow passage of boats or other traffic. Steel movable bridges include lift, bascule (drawbridge), and swing types.
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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.