I 15 FRONTAGE RD
Carrying I 15 FRONTAGE RD over CATARACT CREEK 030
1M E BASIN, Jefferson, Montana
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: I 15 FRONTAGE RD
The I 15 FRONTAGE RD bridge in Jefferson, Montana carries I 15 FRONTAGE RD over CATARACT CREEK 030. It was built in 1933, making it 93 years old today. The structure is built primarily of concrete and spans 3 sections, stretching 24.3 meters (80 feet) end to end. Daily traffic averages 100 vehicles, placing it in the lower-traffic tier of Montana bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show a deck rating of 5/9, superstructure at 5/9, substructure at 4/9. The weakest component sits in poor condition. At least one major component here scores 4 or below, which produces a Poor condition classification under FHWA's current reporting rules. Its NBI inventory load rating is 26.3 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How I 15 FRONTAGE RD 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 How the historical reference is calculated.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
- 1933
- Material
- Concrete
- Number of Spans
- 3
- Structure Length
- 24.3 m (80 ft)
- Deck Width
- 7.7 m (25 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 100 vehicles/day
- Structure Number
- L22099008+00001
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.
- • The superstructure (beams and supports above the deck) is in fair condition (5/9), with minor deterioration that may require routine maintenance.
- • The substructure (piers and abutments) rates poor at 4/9, advanced deterioration that should be prioritized for repair.
How to read this record
I 15 FRONTAGE RD is in the federal Poor condition category. That is a component-based result, not a closure order.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Understand what Poor condition does and does not mean before drawing conclusions. Poor condition explained
- Compare I 15 FRONTAGE RD 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 I 15 FRONTAGE RD?
I 15 FRONTAGE RD in Jefferson, Montana has a deck rating of 5/9, superstructure rating of 5/9, and substructure rating of 4/9 on the FHWA's 0–9 scale.
How often is I 15 FRONTAGE RD inspected?
I 15 FRONTAGE 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 100 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. I 15 FRONTAGE RD is currently shown as Poor condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for I 15 FRONTAGE RD?
I 15 FRONTAGE RD has an NBI inventory load rating of 26.3 metric tons.
Who is responsible for maintaining I 15 FRONTAGE RD?
I 15 FRONTAGE RD is owned and maintained by State Highway Agency.
How old is I 15 FRONTAGE RD and does age affect safety?
I 15 FRONTAGE RD was built in 1933, making it 93 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.