OR 99W (Hwy 91)
Carrying OR 99W (Hwy 91) over North Fork Ash Creek
007 MI N MONMOUTH, Polk, Oregon
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
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. Its NBI inventory load rating is 19.8 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How OR 99W (Hwy 91) 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 How the historical reference is calculated.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
- 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
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗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 that may require priority repair.
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.
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.