STC 3770;STAR RD
Carrying STC 3770;STAR RD over BOISE RIVER(STAR BRIDGE)
0.8 S. STAR, Ada, Idaho
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: STC 3770;STAR RD
The STC 3770;STAR RD bridge in Ada, Idaho carries STC 3770;STAR RD over BOISE RIVER(STAR BRIDGE). It was built in 1982, making it 44 years old today. The structure is built primarily of prestressed concrete and spans 4 sections, stretching 115.2 meters (378 feet) end to end. Daily traffic averages 11,000 vehicles, placing it in the heavily-trafficked tier of Idaho bridges. It is owned and maintained by County Highway Agency.
The latest FHWA inspection records show a deck rating of 7/9, superstructure at 7/9, substructure at 5/9. The weakest component sits in fair condition. All reported major components score above the Poor range. Its NBI inventory load rating is 30.8 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How STC 3770;STAR RD 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 How the historical reference is calculated.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
- 1982
- Material
- Prestressed Concrete
- Number of Spans
- 4
- Structure Length
- 115.2 m (378 ft)
- Deck Width
- 13.9 m (46 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 11,000 vehicles/day
- Structure Number
- 000000000019750
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The deck (driving surface) is in good condition (7/9), showing no significant deterioration.
- • The superstructure (beams and supports above the deck) rates good at 7/9, with no significant deterioration on file.
- • At 5/9, 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 STC 3770;STAR RD 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 STC 3770;STAR RD against other structures in Ada 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 STC 3770;STAR RD?
STC 3770;STAR RD in Ada, Idaho has a deck rating of 7/9, superstructure rating of 7/9, and substructure rating of 5/9 on the FHWA's 0–9 scale.
How often is STC 3770;STAR RD inspected?
STC 3770;STAR RD'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 11,000 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. STC 3770;STAR RD 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 STC 3770;STAR RD?
STC 3770;STAR RD has an NBI inventory load rating of 30.8 metric tons.
Who is responsible for maintaining STC 3770;STAR RD?
STC 3770;STAR RD is owned and maintained by County Highway Agency.
How old is STC 3770;STAR RD and does age affect safety?
STC 3770;STAR RD was built in 1982, making it 44 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.