OR 99W (HWY 91)
Carrying OR 99W (HWY 91) over Baskett Slough
065 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 15% of rated Oregon bridges on inventory load rating (18 t), while its 1923 build year is earlier than 97% of Polk's recorded-year cohort (161 bridges).
OR 99W (HWY 91) in Polk, Oregon is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 1923, 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:00827A01W 05633
PRE-1950 · CONCRETE · MULTI-SPAN · TIED-CTRL · HEAVY-ADT · LIGHT-LOAD · CAT-FAIR
- PRE-1950 Pre-1950
- CONCRETE Concrete
- MULTI-SPAN 2 spans
- TIED-CTRL Tied control
- HEAVY-ADT Heavy ADT
- LIGHT-LOAD Light 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: OR 99W (HWY 91)
The OR 99W (HWY 91) bridge in Polk, Oregon carries OR 99W (HWY 91) over Baskett Slough. It was built in 1923, making it 103 years old today. It was last reconstructed in 1960, extending its service life. The structure is built primarily of concrete continuous and spans 2 sections, stretching 12.6 meters (41 feet) end to end. Daily traffic averages 11,202 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 6/9, 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.
How OR 99W (HWY 91) compares
Age against the county: built in 1923, earlier than 156 of Polk's 161 bridges with a recorded construction year (97%), 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
18 Top 85% higher than 15% 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
- 1923
- Last Reconstructed
- 1960
- Material
- Concrete Continuous
- Number of Spans
- 2
- Structure Length
- 12.6 m (41 ft)
- Deck Width
- 13.7 m (45 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 11,202 vehicles/day
- Structure Number
- 00827A01W 05633
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) rates fair at 6/9, minor deterioration that routine maintenance should address.
- • The substructure (piers and abutments) is in fair condition (6/9), with minor deterioration that may require routine maintenance.
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 OR 99W (HWY 91) 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 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 6/9, and substructure rating of 6/9 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 11,202 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 Fair 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 17.8 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 1923, making it 103 years old and last reconstructed in 1960.
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.