Analyzing deck conditions, superstructure ratings, and bad puns...
Analyzing deck conditions, superstructure ratings, and bad puns...
41,685 bridges are in poor condition. But this loading screen isn't one of them.
over H ST H ST-S51 ON-RAMP
03-SAC-051-1.15-SAC
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 15,000 vehicles per day and is 60 years old.
Its sufficiency rating of 57.3 places it below 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 411 feet long — a short crossing, about 10-15 seconds.
A standard overpass design with solid barriers on each side.
About 15 feet above ground — standard overpass height.
About 15,000 vehicles cross daily — moderate traffic, some congestion possible.
The deck is 34 feet wide with 2-3 lanes — moderate 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
1966
60 years old
Structure Type
Concrete (Continuous) Box Beam (Multiple)
Total Length
411 ft
125.3 m
Deck Width
34 ft
10.4 m
Spans
4
sections between supports
Max Span
112 ft
longest unsupported section (34.0 m)
Traffic Lanes
2 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
15,000vehicles/day
38.57472°N, 121.46709°W
Concrete (Continuous) Box Beam (Multiple)
A concrete box beam bridge uses hollow rectangular concrete sections. The box shape provides excellent torsional resistance and allows for longer spans.
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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.