Why do engineers love bridges? They're outstanding in their field.
Why do engineers love bridges? They're outstanding in their field.
The Brooklyn Bridge was sold to gullible tourists so many times it became a saying.
over MERRIMACK RIVER CSX
NASHUA-HUDSON TL
Parametric wireframe generated from real NBI dimensions. Drag to rotate, scroll to zoom.
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This bridge has a Good overall condition rating of 7 out of 9. It is in good structural condition and is not classified as structurally deficient.
The bridge carries 50,841 vehicles per day and is 53 years old (reconstructed in 1999).
Its sufficiency rating of 69.3 is above the national average of 63.6.
The NBI records a navigation clearance of 22 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 772 feet long — a moderate crossing, about 30 seconds.
A standard overpass design with solid barriers on each side.
About 22 feet above ground — moderate height, similar to a 3-5 story building.
About 50,841 vehicles cross daily — heavy traffic, congestion likely during rush hours.
The deck is 62 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
1973
53 years old (rebuilt 1999)
Structure Type
Steel (Continuous) Stringer/Multi-beam/Girder
Total Length
772 ft
235.3 m
Deck Width
62 ft
18.9 m
Spans
4
sections between supports
Max Span
216 ft
longest unsupported section (65.8 m)
Traffic Lanes
3 lanes
One-way traffic
Clearance Below
22 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
50,841vehicles/day
42.72427°N, 71.43832°W
Steel (Continuous) 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.