HWY 164
Carrying HWY 164 over I-5 (HWY 1)
003 MI S SB HWY 001 JCT, Marion, Oregon
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
HWY 164 in Marion, Oregon sits above 27% of rated Oregon bridges on inventory load rating (22 t), while its 1958 build year is earlier than 71% of Marion's recorded-year cohort (373 bridges).
HWY 164 in Marion, Oregon is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 1958, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 6. The lowest applicable rating sets the federal condition category, so this Fair 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 OR:07941 164 00025
INTERSTATE-ERA · CONCRETE · LONG-SPAN-RUN · TIED-CTRL · ARTERIAL-ADT · STANDARD-LOAD · CAT-FAIR
- INTERSTATE-ERA 1950–1979
- CONCRETE Concrete
- LONG-SPAN-RUN 5 spans
- TIED-CTRL Tied control
- ARTERIAL-ADT Arterial ADT
- STANDARD-LOAD Standard load
- CAT-FAIR Fair
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: HWY 164
The HWY 164 bridge in Marion, Oregon carries HWY 164 over I-5 (HWY 1). It was built in 1958, making it 68 years old today. It was last reconstructed in 1995, extending its service life. The structure is built primarily of concrete continuous and spans 5 sections, stretching 82.6 meters (271 feet) end to end. Daily traffic averages 3,109 vehicles, placing it in the moderately-trafficked tier of Oregon bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show a deck rating of 6/9, superstructure at 6/9, substructure at 6/9. The weakest component sits in fair condition. None of this bridge's reported major components fall into the Poor condition range.
How HWY 164 compares
Age against the county: built in 1958, earlier than 263 of Marion's 373 bridges with a recorded construction year (71%), against a county median build year of 1969. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across Oregon bridges with a recorded inventory load rating (8,282 of 8,305 rated).
HWY 164 vs every rated Oregon bridge
Inventory load rating (metric tons), FHWA NBI, this state
22 Top 73% higher than 27% of 8,282 bridges
rated Oregon 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.
Marion inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 373 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
- 1958
- Last Reconstructed
- 1995
- Material
- Concrete Continuous
- Number of Spans
- 5
- Structure Length
- 82.6 m (271 ft)
- Deck Width
- 9.4 m (31 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 3,109 vehicles/day
- Structure Number
- 07941 164 00025
Condition Analysis
- • The deck (driving surface) is in fair condition (6/9), with minor deterioration that may require routine maintenance.
- • The superstructure (beams and supports above the deck) is in fair condition (6/9), with minor deterioration that may require routine maintenance.
- • The substructure (piers and abutments) rates fair at 6/9, minor deterioration that routine maintenance should address.
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 HWY 164 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 HWY 164 against other structures in Marion 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 HWY 164?
HWY 164 in Marion, Oregon has a deck rating of 6/9, superstructure rating of 6/9, and substructure rating of 6/9 on the FHWA's 0–9 scale.
How often is HWY 164 inspected?
HWY 164'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 3,109 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. HWY 164 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 HWY 164?
HWY 164 has an NBI inventory load rating of 21.7 metric tons.
Who is responsible for maintaining HWY 164?
HWY 164 is owned and maintained by State Highway Agency.
How old is HWY 164 and does age affect safety?
HWY 164 was built in 1958, making it 68 years old and last reconstructed in 1995.
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.
Share this inspection record
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.