Why was the bridge always tired? Too many crossings.
Why was the bridge always tired? Too many crossings.
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over US HIGHWAY 101
04-MRN-101-7.37-CMAD
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 40,000 vehicles per day and is 69 years old (reconstructed in 1985).
Its sufficiency rating of 56.7 places it below the national average of 63.6.
The NBI records a navigation clearance of 18 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 802 feet long — a moderate crossing, about 30 seconds.
A standard overpass design with solid barriers on each side.
About 18 feet above ground — moderate height, similar to a 3-5 story building.
About 40,000 vehicles cross daily — moderate traffic, some congestion possible.
The deck is 64 feet wide with 3-4 lanes — standard width.
This bridge crosses over land, not water — no water views 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
1957
69 years old (rebuilt 1985)
Structure Type
Steel Stringer/Multi-beam/Girder
Total Length
802 ft
244.4 m
Deck Width
64 ft
19.4 m
Spans
4
sections between supports
Max Span
83 ft
longest unsupported section (25.3 m)
Traffic Lanes
4 lanes
Two-way traffic
Clearance Below
18 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
40,000vehicles/day
37.92538°N, 122.51592°W
Steel 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.