Why do engineers love bridges? They're outstanding in their field.
Why do engineers love bridges? They're outstanding in their field.
Bridges: the original social network. Connecting communities since 850 BC.
over TANANA RIVER AT NENANA
MILE POINT 270.7
Parametric wireframe generated from real NBI dimensions. Drag to rotate, scroll to zoom.
Loading 3D model...
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 1,710 vehicles per day and is 59 years old.
Its sufficiency rating of 67.5 is above the national average of 63.6.
The NBI records a navigation clearance of 40 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 may cause some awareness for travelers with bridge anxiety, but has manageable characteristics.
This bridge is 1307 feet long — a moderate crossing, about 30 seconds.
A truss bridge — the steel framework can provide a sense of enclosure.
About 40 feet above ground — moderate height, similar to a 3-5 story building.
About 1,710 vehicles cross daily — light traffic, a smooth crossing.
The deck is 36 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
1967
59 years old
Structure Type
Steel Truss (Thru)
Total Length
1,307 ft
398.4 m
Deck Width
36 ft
11.0 m
Spans
2
sections between supports
Max Span
500 ft
longest unsupported section (152.4 m)
Traffic Lanes
2 lanes
Two-way traffic
Clearance Below
40 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
1,710vehicles/day
64.56577°N, 149.10234°W
Steel Truss (Thru)
A steel truss bridge uses a framework of interconnected triangular elements. The geometric rigidity of triangles makes this design extremely efficient at distributing loads.
Learn more about this bridge typeNo ratings yet. Be the first to rate this bridge!
Sign in and track Alaska to receive alerts when new inspection data is published. Premium members get bridge-specific notifications.
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.