Analyzing deck conditions, superstructure ratings, and bad puns...
Analyzing deck conditions, superstructure ratings, and bad puns...
Why don't bridges ever get lonely? Because they're always making connections.
over ISTHMUS SLOUGH
00.2 MI SW EASTSIDE SCL
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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 10,903 vehicles per day and is 95 years old (reconstructed in 1960).
Its sufficiency rating of 52.4 places it below the national average of 63.6.
The NBI records a navigation clearance of 28 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 1691 feet long — a longer crossing, over 1 minute.
A movable bridge — it may occasionally stop for boat traffic.
About 28 feet above ground — moderate height, similar to a 3-5 story building.
About 10,903 vehicles cross daily — moderate traffic, some congestion possible.
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
1931
95 years old (rebuilt 1960)
Structure Type
Steel Movable (Bascule)
Total Length
1,691 ft
515.4 m
Deck Width
36 ft
11.0 m
Spans
1
sections between supports
Max Span
140 ft
longest unsupported section (42.7 m)
Traffic Lanes
2 lanes
Two-way traffic
Clearance Below
28 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
10,903vehicles/day
43.35651°N, 124.19400°W
Steel Movable (Bascule)
A movable bridge can change position to allow passage of boats or other traffic. Steel movable bridges include lift, bascule (drawbridge), and swing types.
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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.