STC6705;ST CLAIR
Carrying STC6705;ST CLAIR over W. BRANCH SAND CREEK
3.8 S. 1.9 E. IDAHO FALLS, Bonneville, Idaho
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: STC6705;ST CLAIR
The STC6705;ST CLAIR bridge in Bonneville, Idaho carries STC6705;ST CLAIR over W. BRANCH SAND CREEK. It was built in 1966, making it 60 years old today. The structure is built primarily of prestressed concrete and spans 1 section, stretching 13.4 meters (44 feet) end to end. Daily traffic averages 2,600 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 6/9, 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. Its NBI inventory load rating is 16.3 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How STC6705;ST CLAIR 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 How the historical reference is calculated.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
- 1966
- Material
- Prestressed Concrete
- Number of Spans
- 1
- Structure Length
- 13.4 m (44 ft)
- Deck Width
- 11.9 m (39 ft)
- Owner
- City/Municipal Highway Agency
- Avg Daily Traffic
- 2,600 vehicles/day
- Structure Number
- 000000000020800
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • At 6/9, the deck (driving surface) shows fair condition, with minor wear flagged for upkeep.
- • The superstructure (beams and supports above the deck) is in fair condition (6/9), with minor deterioration that may require routine maintenance.
- • At 6/9, the substructure (piers and abutments) shows fair condition, with minor wear flagged for upkeep.
How to read this record
This page shows what the last federal inspection recorded, not whether STC6705;ST CLAIR 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 STC6705;ST CLAIR against other structures in Bonneville 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 STC6705;ST CLAIR?
STC6705;ST CLAIR in Bonneville, Idaho has a deck rating of 6/9, superstructure rating of 6/9, and substructure rating of 6/9 on the FHWA's 0–9 scale.
How often is STC6705;ST CLAIR inspected?
STC6705;ST CLAIR'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 2,600 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. STC6705;ST CLAIR 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 STC6705;ST CLAIR?
STC6705;ST CLAIR has an NBI inventory load rating of 16.3 metric tons.
Who is responsible for maintaining STC6705;ST CLAIR?
STC6705;ST CLAIR is owned and maintained by City/Municipal Highway Agency.
How old is STC6705;ST CLAIR and does age affect safety?
STC6705;ST CLAIR was built in 1966, making it 60 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.