Almost there! Just bridging the gap...
Almost there! Just bridging the gap...
Fun fact: The average American crosses 4 bridges a day without even noticing.
over DOW ROAD
1.7 MI JCT I-89
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 5 out of 9. While it is not classified as structurally deficient, it shows some deterioration that is being monitored.
The bridge carries 78,501 vehicles per day and is 69 years old (reconstructed in 1978).
Its sufficiency rating of 58.0 places it below the national average of 63.6.
The NBI records a navigation clearance of 14 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 30 feet long — a quick crossing, under 5 seconds at highway speed.
This is a culvert — you may not even notice you're crossing it.
About 14 feet above ground — standard overpass height.
About 78,501 vehicles cross daily — heavy traffic, congestion likely during rush hours.
The deck is 0 feet wide — a very narrow, single-lane crossing.
This bridge crosses over land, not water — no water views 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
1957
69 years old (rebuilt 1978)
Structure Type
Concrete Culvert
Total Length
30 ft
9.1 m
Spans
1
sections between supports
Max Span
30 ft
longest unsupported section (9.1 m)
Traffic Lanes
6 lanes
Two-way traffic
Clearance Below
14 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
78,501vehicles/day
43.15406°N, 71.50710°W
Concrete Culvert
A concrete culvert is a drainage structure that allows water to flow beneath a road. While technically not a traditional bridge, culverts over 20 feet are tracked in the national inventory.
Learn more about this bridge typeNo ratings yet. Be the first to rate this bridge!
Sign in and track New Hampshire 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.