N3520
Carrying N3520 over COAL CREEK
.1E 4.1S OF RALSTON, Pawnee, Oklahoma
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: N3520
The N3520 bridge in Pawnee, Oklahoma carries N3520 over COAL CREEK. It was built in 1947, making it 79 years old today. The structure is built primarily of concrete and spans 3 sections, stretching 36.0 meters (118 feet) end to end. Daily traffic averages 162 vehicles, placing it in the lower-traffic tier of Oklahoma bridges. It is owned and maintained by County Highway Agency.
The latest FHWA inspection records show a deck rating of 6/9, superstructure at 6/9, substructure at 5/9. The weakest component sits in fair condition. None of this bridge's reported major components fall into the Poor condition range.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How N3520 compares
Live comparison across Oklahoma.
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 How the historical reference is calculated.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
- 1947
- Material
- Concrete
- Number of Spans
- 3
- Structure Length
- 36.0 m (118 ft)
- Deck Width
- 7.4 m (24 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 162 vehicles/day
- Structure Number
- 107210000000000
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗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) is in fair condition (5/9), with minor deterioration that may require routine maintenance.
How to read this record
This page shows what the last federal inspection recorded, not whether N3520 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 N3520 against other structures in Pawnee and across Oklahoma. Oklahoma 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 N3520?
N3520 in Pawnee, Oklahoma has a deck rating of 6/9, superstructure rating of 6/9, and substructure rating of 5/9 on the FHWA's 0–9 scale.
How often is N3520 inspected?
N3520'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 162 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. N3520 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 N3520?
An inventory load rating is not recorded for N3520.
Who is responsible for maintaining N3520?
N3520 is owned and maintained by County Highway Agency.
How old is N3520 and does age affect safety?
N3520 was built in 1947, making it 79 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.