Connecting the data points... literally.
Connecting the data points... literally.
Gathering condition ratings from coast to coast...
over CONTRA COSTA CANAL
AT SR 4
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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 16,200 vehicles per day and is 57 years old (reconstructed in 1995).
Its sufficiency rating of 71.3 is above the national average of 63.6.
For travelers with bridge anxiety
This bridge is likely to be a comfortable crossing for most travelers.
This bridge is 37 feet long — a quick crossing, under 5 seconds at highway speed.
A standard overpass design with solid barriers on each side.
No height data available — likely a standard overpass height.
About 16,200 vehicles cross daily — moderate traffic, some congestion possible.
The deck is 134 feet wide with multiple lanes — easy to stay in a center lane.
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
1969
57 years old (rebuilt 1995)
Structure Type
Concrete Tee Beam
Total Length
37 ft
11.3 m
Deck Width
134 ft
40.8 m
Spans
1
sections between supports
Max Span
35 ft
longest unsupported section (10.6 m)
Traffic Lanes
8 lanes
Two-way traffic
Daily Traffic
16,200vehicles/day
38.01953°N, 121.94172°W
Concrete Tee Beam
A concrete tee beam bridge uses T-shaped cross-section beams where the top flange serves as part of the deck, efficiently using concrete in both compression and tension.
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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.