ARDENWOOD BL
Carrying ARDENWOOD BL over ALAMEDA FLOOD CNTRL CHNL
0.1 MI S/E LOWRY RD, Alameda, California
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
ARDENWOOD BL in Alameda, California sits above 8% of rated California bridges on inventory load rating (18 t), while its 1965 build year is earlier than 65% of Alameda's recorded-year cohort (658 bridges).
ARDENWOOD BL in Alameda, California is rated Poor in the FHWA's 2024 National Bridge Inventory. Built in 1965, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 4. The lowest applicable rating sets the federal condition category, so this Poor result describes the weakest reported component rather than the structure as a whole. No NBI category is a closure decision or a live crossing-safety verdict.
NBI record plate
Structure CA:33C0110
INTERSTATE-ERA · PRESTRESS · LONG-SPAN-RUN · DECK-LED · HEAVY-ADT · LIGHT-LOAD · CAT-POOR
- INTERSTATE-ERA 1950–1979
- PRESTRESS Prestressed concrete
- LONG-SPAN-RUN 5 spans
- DECK-LED Deck-led
- HEAVY-ADT Heavy ADT
- LIGHT-LOAD Light load
- CAT-POOR Poor
Inspection-sheet codes from this record’s year, material family, spans, controlling component, ADT, inventory load, and NBI category, not a live closure verdict.
Bridge Snapshot: ARDENWOOD BL
The ARDENWOOD BL bridge in Alameda, California carries ARDENWOOD BL over ALAMEDA FLOOD CNTRL CHNL. It was built in 1965, making it 61 years old today. It was last reconstructed in 1990, extending its service life. The structure is built primarily of prestressed concrete and spans 5 sections, stretching 128.3 meters (421 feet) end to end. Daily traffic averages 17,800 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. At least one major component here scores 4 or below, which produces a Poor condition classification under FHWA's current reporting rules.
How ARDENWOOD BL compares
Age against the county: built in 1965, earlier than 426 of Alameda's 658 bridges with a recorded construction year (65%), against a county median build year of 1970. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across California bridges with a recorded inventory load rating (25,538 of 25,848 rated).
ARDENWOOD BL vs every rated California bridge
Inventory load rating (metric tons), FHWA NBI, this state
18 Top 92% higher than 8% of 25,538 bridges
rated California bridges, bucketed by value
Each bar is a band; taller bars hold more bridges. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source FHWA National Bridge Inventory · August 2026
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Reported 0–9 component ratings from the FHWA NBI. The highlighted component is the lowest reported input to this record’s current condition category; it is not a closure or live crossing-safety decision.
Alameda inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 658 bridges in this county. Orthogonal to this structure's component profile above: a county catalog share, not a live crossing-safety verdict.
Structural Details
- Year Built
- 1965
- Last Reconstructed
- 1990
- Material
- Prestressed Concrete
- Number of Spans
- 5
- Structure Length
- 128.3 m (421 ft)
- Deck Width
- 20.8 m (68 ft)
- Owner
- City/Municipal Highway Agency
- Avg Daily Traffic
- 17,800 vehicles/day
- Structure Number
- 33C0110
Condition Analysis
- • The deck (driving surface) rates poor at 4/9, with advanced deterioration recorded on the latest inspection.
- • 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.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
ARDENWOOD BL 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 ARDENWOOD BL against other structures in Alameda 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 ARDENWOOD BL?
ARDENWOOD BL in Alameda, 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 ARDENWOOD BL inspected?
ARDENWOOD BL'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 17,800 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. ARDENWOOD BL 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 ARDENWOOD BL?
ARDENWOOD BL has an NBI inventory load rating of 17.8 metric tons.
Who is responsible for maintaining ARDENWOOD BL?
ARDENWOOD BL is owned and maintained by City/Municipal Highway Agency.
How old is ARDENWOOD BL and does age affect safety?
ARDENWOOD BL was built in 1965, making it 61 years old and last reconstructed in 1990.
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.
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Send this source-bounded record or download its data card. An NBI condition category is not a closure or live crossing-safety verdict.
Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. Component ratings, ADT, and condition category on this page are copied from the NBI record for this structure; no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2024 NBI release. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.