I-280 SOUTHBOUND
Carrying I-280 SOUTHBOUND over ALPINE RD & LOS TRANCOS
04-SM-280-R0.01, San Mateo, California
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: I-280 SOUTHBOUND
The I-280 SOUTHBOUND bridge in San Mateo, California carries I-280 SOUTHBOUND over ALPINE RD & LOS TRANCOS. It was built in 1969, making it 57 years old today. The structure is built primarily of concrete continuous. Daily traffic averages 3,500 vehicles, placing it in the moderately-trafficked tier of California bridges.
The latest FHWA inspection records show limited component ratings on file. The weakest component sits in unrated condition. None of this bridge's reported major components fall into the Poor condition range.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How I-280 SOUTHBOUND compares
Live comparison across California.
Historical Sufficiency Rating
PlainBridge-computedFHWA discontinued this calculated item; it does not determine current condition, funding eligibility, posting, or closure. How the historical reference is calculated.
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Structural Details
- Year Built
- 1969
- Material
- Concrete Continuous
- Avg Daily Traffic
- 3,500 vehicles/day
- Structure Number
- 35 0009L
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
This page shows what the last federal inspection recorded, not whether I-280 SOUTHBOUND is safe to cross today. Here is how to use it.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Learn how the 0–9 condition scale and Good/Fair/Poor categories are defined. How condition ratings work
- Compare I-280 SOUTHBOUND against other structures in San Mateo and across California. California bridges
- Noticed visible damage or a safety concern? Report it to the agency that owns the bridge, or call 911 in an emergency. How to report a bridge
Condition codes come straight from the FHWA National Bridge Inventory and are not a real-time safety judgment. Only the owning agency, a state DOT, county, or other owner, can post, restrict, or close a bridge.
Frequently Asked Questions
What do the condition ratings mean for I-280 SOUTHBOUND?
I-280 SOUTHBOUND in San Mateo, California on the FHWA's 0–9 scale.
How often is I-280 SOUTHBOUND inspected?
I-280 SOUTHBOUND's responsible agency sets its routine interval under FHWA's risk-based inspection rules; this page does not expose the scheduled interval. It carries about 3,500 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. I-280 SOUTHBOUND is currently shown as unrated condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for I-280 SOUTHBOUND?
An inventory load rating is not recorded for I-280 SOUTHBOUND.
Who is responsible for maintaining I-280 SOUTHBOUND?
Ownership is not specified for I-280 SOUTHBOUND in the NBI.
How old is I-280 SOUTHBOUND and does age affect safety?
I-280 SOUTHBOUND was built in 1969, making it 57 years old.
Disclaimer: Bridge condition data is from the FHWA NBI and reflects the last reported inspection. A Poor condition rating is not a live declaration that a bridge is closed or unsafe for travel. For current closure, posting, or safety information, contact the responsible transportation agency.
Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.