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Fetching data from the National Bridge Inventory...
over BACK BAY (ATLANTIC O)
1.6 MI S TOWNLINE
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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 42,190 vehicles per day and is 66 years old (reconstructed in 2011).
Its sufficiency rating of 64.1 is above the national average of 63.6.
The NBI records a navigation clearance of 30 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 508 feet long — a short crossing, about 10-15 seconds.
A standard overpass design with solid barriers on each side.
About 30 feet above ground — moderate height, similar to a 3-5 story building.
About 42,190 vehicles cross daily — moderate traffic, some congestion possible.
The deck is 140 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
1960
66 years old (rebuilt 2011)
Structure Type
Steel (Continuous) Stringer/Multi-beam/Girder
Total Length
508 ft
154.8 m
Deck Width
140 ft
42.6 m
Spans
4
sections between supports
Max Span
139 ft
longest unsupported section (42.4 m)
Traffic Lanes
6 lanes
One-way traffic
Clearance Below
30 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
42,190vehicles/day
43.67630°N, 70.25637°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.