The average US bridge is 48 years old. That's a lot of birthday candles.
The average US bridge is 48 years old. That's a lot of birthday candles.
Bridges: the original social network. Connecting communities since 850 BC.
over SPEARFISH CK
CANYON ST - SPEARFISH
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 1,664 vehicles per day and is 34 years old.
Its sufficiency rating of 64.0 is above 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 65 feet long — a quick crossing, under 5 seconds at highway speed.
A standard overpass design with solid barriers on each side.
No height data available — likely a standard overpass height.
About 1,664 vehicles cross daily — light traffic, a smooth crossing.
The deck is 38 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
1992
34 years old
Structure Type
Wood/Timber Box Beam (Multiple)
Total Length
65 ft
19.8 m
Deck Width
38 ft
11.6 m
Spans
1
sections between supports
Max Span
63 ft
longest unsupported section (19.2 m)
Traffic Lanes
2 lanes
Two-way traffic
Daily Traffic
1,664vehicles/day
44.48147°N, 103.85983°W
Wood/Timber Box Beam (Multiple)
A timber stringer bridge uses wooden beams as the primary structure. While less common today, timber bridges remain practical for low-traffic rural roads and historic settings.
Learn more about this bridge typeNo ratings yet. Be the first to rate this bridge!
Sign in and track South Dakota 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.