Connecting the data points... literally.
Connecting the data points... literally.
Fetching data from the National Bridge Inventory...
over Columbia River
AT INTERSTATE BRIDGE
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 65,013 vehicles per day and is 110 years old (reconstructed in 1958).
Its sufficiency rating of 51.5 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 has some features that may be challenging for travelers with bridge anxiety. See the tips below for a more comfortable crossing.
This bridge is 3538 feet long — an extended crossing, several minutes.
A movable bridge — it may occasionally stop for boat traffic.
About 15 feet above ground — standard overpass height.
About 65,013 vehicles cross daily — heavy traffic, congestion likely during rush hours.
The deck is 45 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
1916
110 years old (rebuilt 1958)
Structure Type
Steel Movable (Lift)
Total Length
3,538 ft
1078.4 m
Deck Width
45 ft
13.8 m
Spans
1
sections between supports
Max Span
279 ft
longest unsupported section (85.0 m)
Traffic Lanes
3 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
65,013vehicles/day
45.61804°N, 122.67527°W
Steel Movable (Lift)
A movable bridge can change position to allow passage of boats or other traffic. Steel movable bridges include lift, bascule (drawbridge), and swing types.
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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.