Crunching the numbers on America's infrastructure...
Crunching the numbers on America's infrastructure...
Why did the truss bridge break up with the beam bridge? It needed more support.
over X ST-E50 X ST BROADWAY
03-SAC-050-L2.33-SAC
Parametric wireframe generated from real NBI dimensions. Drag to rotate, scroll to zoom.
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This bridge has a Good overall condition rating of 7 out of 9. It is in good structural condition and is not classified as structurally deficient.
The bridge carries 45,000 vehicles per day and is 58 years old.
Its sufficiency rating of 64.4 is above the national average of 63.6.
The NBI records a navigation clearance of 15 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 975 feet long — a moderate crossing, about 30 seconds.
A standard overpass design with solid barriers on each side.
About 15 feet above ground — standard overpass height.
About 45,000 vehicles cross daily — moderate traffic, some congestion possible.
The deck is 70 feet wide with multiple lanes — easy to stay in a center lane.
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
1968
58 years old
Structure Type
Prestressed Concrete Box Beam (Multiple)
Total Length
975 ft
297.2 m
Deck Width
70 ft
21.3 m
Spans
13
sections between supports
Max Span
188 ft
longest unsupported section (57.3 m)
Traffic Lanes
4 lanes
One-way traffic
Clearance Below
15 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
45,000vehicles/day
38.55877°N, 121.47636°W
Prestressed Concrete Box Beam (Multiple)
A prestressed concrete box beam bridge combines hollow box sections with prestressing technology, enabling longer spans with reduced weight and material usage.
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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.