SHAMROCK ROAD
Carrying SHAMROCK ROAD over BOULDER RIVER
2 MI PAST WHITEHOUSE C. G, Jefferson, Montana
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: SHAMROCK ROAD
The SHAMROCK ROAD bridge in Jefferson, Montana carries SHAMROCK ROAD over BOULDER RIVER. It was built in 1980, making it 46 years old today. The structure is built primarily of wood or timber and spans 1 section, stretching 8.6 meters (28 feet) end to end. Daily traffic averages 40 vehicles, placing it in the lower-traffic tier of Montana bridges. It is owned and maintained by U.S. Forest Service.
The latest FHWA inspection records show a deck rating of 7/9, superstructure at 7/9, 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 28.2 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How SHAMROCK ROAD compares
Live comparison across Montana.
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 How the historical reference is calculated.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
- 1980
- Material
- Wood or Timber
- Number of Spans
- 1
- Structure Length
- 8.6 m (28 ft)
- Deck Width
- 4.9 m (16 ft)
- Owner
- U.S. Forest Service
- Avg Daily Traffic
- 40 vehicles/day
- Structure Number
- 010207000003047
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) is in good condition (7/9), showing no significant deterioration.
- • The substructure (piers and abutments) rates fair at 6/9, minor deterioration that routine maintenance should address.
How to read this record
This page shows what the last federal inspection recorded, not whether SHAMROCK ROAD 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 SHAMROCK ROAD against other structures in Jefferson and across Montana. Montana 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 SHAMROCK ROAD?
SHAMROCK ROAD in Jefferson, Montana has a deck rating of 7/9, superstructure rating of 7/9, and substructure rating of 6/9 on the FHWA's 0–9 scale.
How often is SHAMROCK ROAD inspected?
SHAMROCK ROAD'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 40 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. SHAMROCK ROAD 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 SHAMROCK ROAD?
SHAMROCK ROAD has an NBI inventory load rating of 28.2 metric tons.
Who is responsible for maintaining SHAMROCK ROAD?
SHAMROCK ROAD is owned and maintained by U.S. Forest Service.
How old is SHAMROCK ROAD and does age affect safety?
SHAMROCK ROAD was built in 1980, making it 46 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.