Connecting the data points... literally.
Connecting the data points... literally.
What do you call a bridge that tells jokes? A pun-toon bridge.
over NAPA RIVER OVERFLOW
300 W SILVERADO TRAIL
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 2,600 vehicles per day and is 116 years old.
Its sufficiency rating of 50.9 places it below the national average of 63.6.
For travelers with bridge anxiety
This bridge may cause some awareness for travelers with bridge anxiety, but has manageable characteristics.
This bridge is 20 feet long — a quick crossing, under 5 seconds at highway speed.
An arch bridge design with some openness to the surroundings.
No height data available — likely a standard overpass height.
About 2,600 vehicles cross daily — light traffic, a smooth crossing.
The deck is 24 feet wide with 1-2 lanes — a narrower crossing.
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
1910
116 years old
Structure Type
Masonry Arch (Deck)
Total Length
20 ft
6.2 m
Deck Width
24 ft
7.2 m
Spans
1
sections between supports
Max Span
20 ft
longest unsupported section (6.2 m)
Traffic Lanes
2 lanes
Two-way traffic
Daily Traffic
2,600vehicles/day
38.36913°N, 122.30211°W
Masonry Arch (Deck)
A masonry arch bridge uses stone or brick arranged in an arch shape — one of the oldest bridge designs in the world. The arch transfers loads to the abutments through compression.
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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.