COPPER BASIN LOOP
Carrying COPPER BASIN LOOP over STAR HOPE CREEK
21.0 E. SUN VALLEY, Custer, Idaho
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: COPPER BASIN LOOP
The COPPER BASIN LOOP bridge in Custer, Idaho carries COPPER BASIN LOOP over STAR HOPE CREEK. It was built in 1970, making it 56 years old today. The structure is built primarily of wood or timber and spans 1 section, stretching 7.9 meters (26 feet) end to end. Daily traffic averages 20 vehicles, placing it in the lower-traffic tier of Idaho bridges. It is owned and maintained by Other Local Agencies.
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. No reported major component scores in the Poor range under the current federal condition thresholds. Its NBI inventory load rating is 27.2 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How COPPER BASIN LOOP 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 How the historical reference is calculated.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
- 1970
- Material
- Wood or Timber
- Number of Spans
- 1
- Structure Length
- 7.9 m (26 ft)
- Deck Width
- 4.9 m (16 ft)
- Owner
- Other Local Agencies
- Avg Daily Traffic
- 20 vehicles/day
- Structure Number
- 000000000036150
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 COPPER BASIN LOOP 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 COPPER BASIN LOOP against other structures in Custer 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 COPPER BASIN LOOP?
COPPER BASIN LOOP in Custer, Idaho 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 COPPER BASIN LOOP inspected?
COPPER BASIN LOOP'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 20 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. COPPER BASIN LOOP 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 COPPER BASIN LOOP?
COPPER BASIN LOOP has an NBI inventory load rating of 27.2 metric tons.
Who is responsible for maintaining COPPER BASIN LOOP?
COPPER BASIN LOOP is owned and maintained by Other Local Agencies.
How old is COPPER BASIN LOOP and does age affect safety?
COPPER BASIN LOOP was built in 1970, making it 56 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.