S FRONTAGE RD W
Carrying S FRONTAGE RD W over CLARK FORK 053
2M W ALBERTON, Mineral, Montana
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
S FRONTAGE RD W in Mineral, Montana sits above 20% of rated Montana bridges on inventory load rating (23 t), while its 1916 build year is earlier than 99% of Mineral's recorded-year cohort (152 bridges).
S FRONTAGE RD W in Mineral, Montana is rated Poor in the FHWA's 2024 National Bridge Inventory. Built in 1916, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 4. The lowest applicable rating sets the federal condition category, so this Poor result describes the weakest reported component rather than the structure as a whole. No NBI category is a closure decision or a live crossing-safety verdict.
NBI record plate
Structure MT:L31089001+04001
PRE-1950 · STEEL · MULTI-SPAN · SUPER-LED · LOCAL-ADT · STANDARD-LOAD · CAT-POOR
- PRE-1950 Pre-1950
- STEEL Steel
- MULTI-SPAN 2 spans
- SUPER-LED Superstructure-led
- LOCAL-ADT Local ADT
- STANDARD-LOAD Standard load
- CAT-POOR Poor
Inspection-sheet codes from this record’s year, material family, spans, controlling component, ADT, inventory load, and NBI category, not a live closure verdict.
Bridge Snapshot: S FRONTAGE RD W
The S FRONTAGE RD W bridge in Mineral, Montana carries S FRONTAGE RD W over CLARK FORK 053. It was built in 1916, making it 110 years old today. It was last reconstructed in 1999, extending its service life. The structure is built primarily of steel and spans 2 sections, stretching 113.1 meters (371 feet) end to end. Daily traffic averages 171 vehicles, placing it in the lower-traffic tier of Montana bridges. It is owned and maintained by County Highway Agency.
The latest FHWA inspection records show a deck rating of 7/9, superstructure at 4/9, substructure at 5/9. The weakest component sits in poor condition. Because at least one major component scores 4 or lower, this bridge falls in FHWA's Poor condition category. That category is not a closure order.
How S FRONTAGE RD W compares
Age against the county: built in 1916, earlier than 150 of Mineral's 152 bridges with a recorded construction year (99%), against a county median build year of 1973. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across Montana bridges with a recorded inventory load rating (5,144 of 5,224 rated).
S FRONTAGE RD W vs every rated Montana bridge
Inventory load rating (metric tons), FHWA NBI, this state
23 Top 80% higher than 20% of 5,144 bridges
rated Montana bridges, bucketed by value
Each bar is a band; taller bars hold more bridges. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source FHWA National Bridge Inventory · August 2026
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Reported 0–9 component ratings from the FHWA NBI. The highlighted component is the lowest reported input to this record’s current condition category; it is not a closure or live crossing-safety decision.
Mineral inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 152 bridges in this county. Orthogonal to this structure's component profile above: a county catalog share, not a live crossing-safety verdict.
Structural Details
- Year Built
- 1916
- Last Reconstructed
- 1999
- Material
- Steel
- Number of Spans
- 2
- Structure Length
- 113.1 m (371 ft)
- Deck Width
- 4.9 m (16 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 171 vehicles/day
- Structure Number
- L31089001+04001
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 poor at 4/9, with advanced deterioration recorded on the latest inspection.
- • The substructure (piers and abutments) is in fair condition (5/9), with minor deterioration that may require routine maintenance.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
S FRONTAGE RD W 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 S FRONTAGE RD W against other structures in Mineral 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 S FRONTAGE RD W?
S FRONTAGE RD W in Mineral, Montana has a deck rating of 7/9, superstructure rating of 4/9, and substructure rating of 5/9 on the FHWA's 0–9 scale.
How often is S FRONTAGE RD W inspected?
S FRONTAGE RD W'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 171 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. S FRONTAGE RD W 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 S FRONTAGE RD W?
S FRONTAGE RD W has an NBI inventory load rating of 22.7 metric tons.
Who is responsible for maintaining S FRONTAGE RD W?
S FRONTAGE RD W is owned and maintained by County Highway Agency.
How old is S FRONTAGE RD W and does age affect safety?
S FRONTAGE RD W was built in 1916, making it 110 years old and last reconstructed in 1999.
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.
Share this inspection record
Send this source-bounded record or download its data card. An NBI condition category is not a closure or live crossing-safety verdict.
Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. Component ratings, ADT, and condition category on this page are copied from the NBI record for this structure; no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2024 NBI release. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.