Did you know? The oldest bridge in the NBI was built in 1697.
Did you know? The oldest bridge in the NBI was built in 1697.
Analyzing deck conditions, superstructure ratings, and bad puns...
over LYNCH CREEK
3.2 MI S PETALUMA HILL RD
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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 11,600 vehicles per day and is 76 years old (reconstructed in 1963).
Its sufficiency rating of 53.1 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 29 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 11,600 vehicles cross daily — moderate traffic, some congestion possible.
The deck is 38 feet wide with 2-3 lanes — moderate 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
1950
76 years old (rebuilt 1963)
Structure Type
Steel Stringer/Multi-beam/Girder
Total Length
29 ft
8.8 m
Deck Width
38 ft
11.6 m
Spans
1
sections between supports
Max Span
27 ft
longest unsupported section (8.3 m)
Traffic Lanes
2 lanes
Two-way traffic
Daily Traffic
11,600vehicles/day
38.27468°N, 122.61919°W
Steel Stringer/Multi-beam/Girder
A steel stringer bridge uses parallel steel beams (stringers) to support the deck. This is one of the most common bridge types in the US, valued for its simplicity and strength.
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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.