Bridges: the original social network. Connecting communities since 850 BC.
Bridges: the original social network. Connecting communities since 850 BC.
Why do engineers love bridges? They're outstanding in their field.
over WATER MERRIMACK RIVER
AT SAINTS MEMOIAL
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 56,200 vehicles per day and is 72 years old (reconstructed in 2012).
Its sufficiency rating of 61.8 places it below the national average of 63.6.
For travelers with bridge anxiety
This bridge may cause some awareness for travelers with bridge anxiety, but has manageable characteristics.
This bridge is 455 feet long — a short crossing, about 10-15 seconds.
A standard overpass design with solid barriers on each side.
No height data available — likely a standard overpass height.
About 56,200 vehicles cross daily — heavy traffic, congestion likely during rush hours.
The deck is 76 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
1954
72 years old (rebuilt 2012)
Structure Type
Steel (Continuous) Stringer/Multi-beam/Girder
Total Length
455 ft
138.7 m
Deck Width
76 ft
23.2 m
Spans
3
sections between supports
Max Span
170 ft
longest unsupported section (51.8 m)
Traffic Lanes
4 lanes
Two-way traffic
Daily Traffic
56,200vehicles/day
42.64682°N, 71.29922°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.