STP 7391;S. MAIN
Carrying STP 7391;S. MAIN over PORTNEUF RIVER
2.0 S. POCATELLO, Bannock, Idaho
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: STP 7391;S. MAIN
The STP 7391;S. MAIN bridge in Bannock, Idaho carries STP 7391;S. MAIN over PORTNEUF RIVER. It was built in 1967, making it 59 years old today. The structure is built primarily of prestressed concrete and spans 3 sections, stretching 35.7 meters (117 feet) end to end. Daily traffic averages 7,800 vehicles, placing it in the moderately-trafficked tier of Idaho bridges. It is owned and maintained by City/Municipal Highway Agency.
The latest FHWA inspection records show a deck rating of 5/9, superstructure at 5/9, substructure at 6/9. The weakest component sits in fair condition. All reported major components score above the Poor range. Its NBI inventory load rating is 22.7 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How STP 7391;S. MAIN compares
Live comparison across Idaho.
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 How the historical reference is calculated.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
- 1967
- Material
- Prestressed Concrete
- Number of Spans
- 3
- Structure Length
- 35.7 m (117 ft)
- Deck Width
- 14.2 m (47 ft)
- Owner
- City/Municipal Highway Agency
- Avg Daily Traffic
- 7,800 vehicles/day
- Structure Number
- 000000000021515
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The deck (driving surface) rates fair at 5/9, minor deterioration that routine maintenance should address.
- • At 5/9, the superstructure (beams and supports above the deck) shows fair condition, with minor wear flagged for upkeep.
- • The substructure (piers and abutments) is in fair condition (6/9), with minor deterioration that may require routine maintenance.
How to read this record
This page shows what the last federal inspection recorded, not whether STP 7391;S. MAIN 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 STP 7391;S. MAIN against other structures in Bannock and across Idaho. Idaho 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 STP 7391;S. MAIN?
STP 7391;S. MAIN in Bannock, Idaho has a deck rating of 5/9, superstructure rating of 5/9, and substructure rating of 6/9 on the FHWA's 0–9 scale.
How often is STP 7391;S. MAIN inspected?
STP 7391;S. MAIN'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 7,800 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. STP 7391;S. MAIN 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 STP 7391;S. MAIN?
STP 7391;S. MAIN has an NBI inventory load rating of 22.7 metric tons.
Who is responsible for maintaining STP 7391;S. MAIN?
STP 7391;S. MAIN is owned and maintained by City/Municipal Highway Agency.
How old is STP 7391;S. MAIN and does age affect safety?
STP 7391;S. MAIN was built in 1967, making it 59 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.