What's a bridge's favorite exercise? Cross-fit.
What's a bridge's favorite exercise? Cross-fit.
Did you know? The oldest bridge in the NBI was built in 1697.
over WATER CHELSEA RIVER
@ CHELSEA TL = C09005
Parametric wireframe generated from real NBI dimensions. Drag to rotate, scroll to zoom.
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This bridge has a Poor overall condition rating of 4 out of 9. This bridge is classified as being in poor condition, meaning one or more structural components have significant deterioration. Poor condition does not mean the bridge is unsafe to drive on, but it does mean repairs or replacement may be needed.
The bridge carries 22,435 vehicles per day and is 72 years old (reconstructed in 2002).
Its sufficiency rating of 38.1 places it below the national average of 63.6.
The NBI records a navigation clearance of 21 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 has some features that may be challenging for travelers with bridge anxiety. See the tips below for a more comfortable crossing.
This bridge is 1075 feet long — a moderate crossing, about 30 seconds.
A movable bridge — it may occasionally stop for boat traffic.
About 21 feet above ground — moderate height, similar to a 3-5 story building.
About 22,435 vehicles cross daily — moderate traffic, some congestion possible.
The deck is 44 feet wide with 2-3 lanes — moderate 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
1954
72 years old (rebuilt 2002)
Structure Type
Steel Movable (Bascule)
Total Length
1,075 ft
327.7 m
Deck Width
44 ft
13.4 m
Spans
1
sections between supports
Max Span
225 ft
longest unsupported section (68.6 m)
Traffic Lanes
2 lanes
Two-way traffic
Clearance Below
21 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
22,435vehicles/day
42.38566°N, 71.03930°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.