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over BONNEVILLE DAM
NEW LOCK SWING 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 6 out of 9. While it is not classified as structurally deficient, it shows some deterioration that is being monitored.
The bridge carries 1,000 vehicles per day and is 34 years old.
Its sufficiency rating of 65.1 is above the national average of 63.6.
The NBI records a navigation clearance of 79 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 338 feet long — a short crossing, about 10-15 seconds.
A movable bridge — it may occasionally stop for boat traffic.
About 79 feet above ground — an elevated crossing, similar to a 5-10 story building.
About 1,000 vehicles cross daily — light traffic, a smooth crossing.
The deck is 31 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
1992
34 years old
Structure Type
Prestressed Concrete (Continuous) Movable (Swing)
Total Length
338 ft
102.9 m
Deck Width
31 ft
9.6 m
Spans
2
sections between supports
Max Span
187 ft
longest unsupported section (56.9 m)
Traffic Lanes
2 lanes
Two-way traffic
Clearance Below
79 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
1,000vehicles/day
45.63670°N, 121.94984°W
Prestressed Concrete (Continuous) Movable (Swing)
A prestressed concrete stringer bridge uses pretensioned concrete beams, where steel tendons are stretched before concrete is poured. This creates stronger, lighter 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.