OR 99W (Hwy 91)
Carrying OR 99W (Hwy 91) over North Fork Ash Creek
007 MI N MONMOUTH, Polk, Oregon
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
OR 99W (Hwy 91) in Polk, Oregon sits above 20% of rated Oregon bridges on inventory load rating (20 t), while its 1954 build year is earlier than 84% of Polk's recorded-year cohort (161 bridges).
OR 99W (Hwy 91) in Polk, Oregon is rated Poor in the FHWA's 2024 National Bridge Inventory. Built in 1954, 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 OR:07615 01W 06201
INTERSTATE-ERA · CONCRETE · MULTI-SPAN · SUB-LED · HEAVY-ADT · LIGHT-LOAD · CAT-POOR
- INTERSTATE-ERA 1950–1979
- CONCRETE Concrete
- MULTI-SPAN 3 spans
- SUB-LED Substructure-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: OR 99W (Hwy 91)
The OR 99W (Hwy 91) bridge in Polk, Oregon carries OR 99W (Hwy 91) over North Fork Ash Creek. It was built in 1954, making it 72 years old today. The structure is built primarily of concrete continuous and spans 3 sections, stretching 15.5 meters (51 feet) end to end. Daily traffic averages 10,967 vehicles, placing it in the heavily-trafficked tier of Oregon bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show a deck rating of 7/9, superstructure at 7/9, substructure at 4/9. 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 OR 99W (Hwy 91) compares
Age against the county: built in 1954, earlier than 136 of Polk's 161 bridges with a recorded construction year (84%), against a county median build year of 1974. 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).
OR 99W (Hwy 91) vs every rated Oregon bridge
Inventory load rating (metric tons), FHWA NBI, this state
20 Top 80% higher than 20% 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.
Polk inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 161 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
- 1954
- Material
- Concrete Continuous
- Number of Spans
- 3
- Structure Length
- 15.5 m (51 ft)
- Deck Width
- 13.0 m (43 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 10,967 vehicles/day
- Structure Number
- 07615 01W 06201
Condition Analysis
- • The deck (driving surface) rates good at 7/9, with no significant deterioration on file.
- • The superstructure (beams and supports above the deck) is in good condition (7/9), showing no significant deterioration.
- • The substructure (piers and abutments) is in poor condition (4/9), showing advanced deterioration on the inspecting agency's 0-9 scale.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
OR 99W (Hwy 91) 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 OR 99W (Hwy 91) against other structures in Polk 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 OR 99W (Hwy 91)?
OR 99W (Hwy 91) in Polk, Oregon has a deck rating of 7/9, superstructure rating of 7/9, and substructure rating of 4/9 on the FHWA's 0–9 scale.
How often is OR 99W (Hwy 91) inspected?
OR 99W (Hwy 91)'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 10,967 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. OR 99W (Hwy 91) 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 OR 99W (Hwy 91)?
OR 99W (Hwy 91) has an NBI inventory load rating of 19.8 metric tons.
Who is responsible for maintaining OR 99W (Hwy 91)?
OR 99W (Hwy 91) is owned and maintained by State Highway Agency.
How old is OR 99W (Hwy 91) and does age affect safety?
OR 99W (Hwy 91) was built in 1954, making it 72 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.
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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.