Fun fact: The average American crosses 4 bridges a day without even noticing.
Fun fact: The average American crosses 4 bridges a day without even noticing.
Connecting the data points... literally.
over CAL SAG CHANNEL
.1MI S OF 171 N JCT
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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 20,500 vehicles per day and is 92 years old (reconstructed in 1997).
Its sufficiency rating of 58.3 places it below the national average of 63.6.
The NBI records a navigation clearance of 38 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 truss bridge — the steel framework can provide a sense of enclosure.
About 38 feet above ground — moderate height, similar to a 3-5 story building.
About 20,500 vehicles cross daily — moderate traffic, some congestion possible.
The deck is 55 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
1934
92 years old (rebuilt 1997)
Structure Type
Steel Truss (Thru)
Total Length
508 ft
154.8 m
Deck Width
55 ft
16.9 m
Spans
1
sections between supports
Max Span
304 ft
longest unsupported section (92.8 m)
Traffic Lanes
4 lanes
Two-way traffic
Clearance Below
38 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
20,500vehicles/day
41.69643°N, 87.93640°W
Steel Truss (Thru)
A steel truss bridge uses a framework of interconnected triangular elements. The geometric rigidity of triangles makes this design extremely efficient at distributing loads.
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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.