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Did you know? The oldest bridge in the NBI was built in 1697.
over TONGASS AVENUE VIADUCT
MILE POINT 1.3
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 14,564 vehicles per day and is 70 years old.
Its sufficiency rating of 62.6 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 1727 feet long — a longer crossing, over 1 minute.
A standard overpass design with solid barriers on each side.
No height data available — likely a standard overpass height.
About 14,564 vehicles cross daily — moderate traffic, some congestion possible.
The deck is 53 feet wide with 3-4 lanes — standard 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
1956
70 years old
Structure Type
Prestressed Concrete Tee Beam
Total Length
1,727 ft
526.4 m
Deck Width
53 ft
16.2 m
Spans
58
sections between supports
Max Span
42 ft
longest unsupported section (12.8 m)
Traffic Lanes
2 lanes
Two-way traffic
Daily Traffic
14,564vehicles/day
55.34611°N, 131.66028°W
Prestressed Concrete Tee Beam
A prestressed concrete tee beam bridge combines the T-shaped cross-section with prestressing technology for improved load capacity and 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.