GRAND ISLAND ROAD
Carrying GRAND ISLAND ROAD over LAMBERT SLOUGH
650 MI S DAYTON, Yamhill, Oregon
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: GRAND ISLAND ROAD
The GRAND ISLAND ROAD bridge in Yamhill, Oregon carries GRAND ISLAND ROAD over LAMBERT SLOUGH. It was built in 1964, making it 62 years old today. The structure is built primarily of concrete continuous and spans 3 sections, stretching 192.9 meters (633 feet) end to end. Daily traffic averages 508 vehicles, placing it in the lower-traffic tier of Oregon bridges. It is owned and maintained by County Highway Agency.
The latest FHWA inspection records show a deck rating of 6/9, superstructure at 5/9, substructure at 6/9. The weakest component sits in fair condition. No reported major component scores in the Poor range under the current federal condition thresholds. Its NBI inventory load rating is 22.0 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How GRAND ISLAND ROAD compares
Live comparison across Oregon.
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 How the historical reference is calculated.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
- 1964
- Material
- Concrete Continuous
- Number of Spans
- 3
- Structure Length
- 192.9 m (633 ft)
- Deck Width
- 9.5 m (31 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 508 vehicles/day
- Structure Number
- 01496A029000327
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • At 6/9, the deck (driving surface) shows fair condition, with minor wear flagged for upkeep.
- • At 5/9, the superstructure (beams and supports above the deck) shows fair condition, with minor wear flagged for upkeep.
- • The substructure (piers and abutments) rates fair at 6/9, minor deterioration that routine maintenance should address.
How to read this record
This page shows what the last federal inspection recorded, not whether GRAND ISLAND ROAD 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 GRAND ISLAND ROAD against other structures in Yamhill and across Oregon. Oregon 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 GRAND ISLAND ROAD?
GRAND ISLAND ROAD in Yamhill, Oregon has a deck rating of 6/9, superstructure rating of 5/9, and substructure rating of 6/9 on the FHWA's 0–9 scale.
How often is GRAND ISLAND ROAD inspected?
GRAND ISLAND ROAD'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 508 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. GRAND ISLAND ROAD is currently shown as Fair condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for GRAND ISLAND ROAD?
GRAND ISLAND ROAD has an NBI inventory load rating of 22.0 metric tons.
Who is responsible for maintaining GRAND ISLAND ROAD?
GRAND ISLAND ROAD is owned and maintained by County Highway Agency.
How old is GRAND ISLAND ROAD and does age affect safety?
GRAND ISLAND ROAD was built in 1964, making it 62 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.