Why did the truss bridge break up with the beam bridge? It needed more support.
Why did the truss bridge break up with the beam bridge? It needed more support.
Fun fact: Covered bridges were roofed to protect the wood, not the travelers.
over ABANDONED RR-ANTELOPE CR
HARLOWTON-THIRD ST NE
Parametric wireframe generated from real NBI dimensions. Drag to rotate, scroll to zoom.
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This bridge has a Poor overall condition rating of 4 out of 9. This bridge is classified as being in poor condition, meaning one or more structural components have significant deterioration. Poor condition does not mean the bridge is unsafe to drive on, but it does mean repairs or replacement may be needed.
The bridge carries 2,063 vehicles per day and is 87 years old.
Its sufficiency rating of 51.5 places it below the national average of 63.6.
The NBI records a navigation clearance of 25 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 204 feet long — a short crossing, about 10-15 seconds.
A standard overpass design with solid barriers on each side.
About 25 feet above ground — moderate height, similar to a 3-5 story building.
About 2,063 vehicles cross daily — light traffic, a smooth crossing.
The deck is 35 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
1939
87 years old
Structure Type
Steel (Continuous) Stringer/Multi-beam/Girder
Total Length
204 ft
62.1 m
Deck Width
35 ft
10.7 m
Spans
3
sections between supports
Max Span
64 ft
longest unsupported section (19.5 m)
Traffic Lanes
2 lanes
Two-way traffic
Clearance Below
25 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
2,063vehicles/day
46.43859°N, 109.82307°W
Steel (Continuous) 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.