Loading structural data... this is riveting stuff.
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Fun fact: Covered bridges were roofed to protect the wood, not the travelers.
over WATER NORTHERN CANAL
JUST S OF MERRIMACK RIV
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 6 out of 9. While it is not classified as structurally deficient, it shows some deterioration that is being monitored.
The bridge carries 27,672 vehicles per day and is 178 years old (reconstructed in 2005).
Its sufficiency rating of 65.7 is above 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 158 feet long — a quick crossing, under 5 seconds at highway speed.
An arch bridge design with some openness to the surroundings.
No height data available — likely a standard overpass height.
About 27,672 vehicles cross daily — moderate traffic, some congestion possible.
The deck is 60 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
1848
178 years old (rebuilt 2005)
Structure Type
Masonry Arch (Deck)
Total Length
158 ft
48.2 m
Deck Width
60 ft
18.3 m
Spans
4
sections between supports
Max Span
39 ft
longest unsupported section (11.9 m)
Traffic Lanes
3 lanes
Two-way traffic
Daily Traffic
27,672vehicles/day
42.64937°N, 71.33006°W
Masonry Arch (Deck)
A masonry arch bridge uses stone or brick arranged in an arch shape — one of the oldest bridge designs in the world. The arch transfers loads to the abutments through compression.
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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.