HILLSDALE BLVD
Carrying HILLSDALE BLVD over MARINA LAGOON
0.1 MI NE OF NORFOLK ST, San Mateo, California
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: HILLSDALE BLVD
The HILLSDALE BLVD bridge in San Mateo, California carries HILLSDALE BLVD over MARINA LAGOON. It was built in 1963, making it 63 years old today. It was last reconstructed in 2003, extending its service life. The structure is built primarily of prestressed concrete and spans 11 sections, stretching 171.6 meters (563 feet) end to end. Daily traffic averages 46,460 vehicles, placing it in the heavily-trafficked tier of California bridges. It is owned and maintained by City/Municipal Highway Agency.
The latest FHWA inspection records show a deck rating of 4/9, superstructure at 7/9, substructure at 5/9. The weakest component sits in poor condition. Because at least one major component scores 4 or lower, this bridge falls in FHWA's Poor condition category. That category is not a closure order. Its NBI inventory load rating is 32.4 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How HILLSDALE BLVD 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 How the historical reference is calculated.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
- 1963
- Last Reconstructed
- 2003
- Material
- Prestressed Concrete
- Number of Spans
- 11
- Structure Length
- 171.6 m (563 ft)
- Deck Width
- 28.8 m (94 ft)
- Owner
- City/Municipal Highway Agency
- Avg Daily Traffic
- 46,460 vehicles/day
- Structure Number
- 35C0068
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • At 4/9, the deck (driving surface) is in poor shape, with advanced wear flagged for priority repair.
- • The superstructure (beams and supports above the deck) rates good at 7/9, with no significant deterioration on file.
- • The substructure (piers and abutments) rates fair at 5/9, minor deterioration that routine maintenance should address.
How to read this record
HILLSDALE BLVD is in the federal Poor condition category. That is a component-based result, not a closure order.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Understand what Poor condition does and does not mean before drawing conclusions. Poor condition explained
- Compare HILLSDALE BLVD 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 HILLSDALE BLVD?
HILLSDALE BLVD in San Mateo, California has a deck rating of 4/9, superstructure rating of 7/9, and substructure rating of 5/9 on the FHWA's 0–9 scale.
How often is HILLSDALE BLVD inspected?
HILLSDALE BLVD'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 46,460 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. HILLSDALE BLVD is currently shown as Poor condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for HILLSDALE BLVD?
HILLSDALE BLVD has an NBI inventory load rating of 32.4 metric tons.
Who is responsible for maintaining HILLSDALE BLVD?
HILLSDALE BLVD is owned and maintained by City/Municipal Highway Agency.
How old is HILLSDALE BLVD and does age affect safety?
HILLSDALE BLVD was built in 1963, making it 63 years old and last reconstructed in 2003.
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.