TWIN BRIDGES RD
Carrying TWIN BRIDGES RD over STILLWATER RIVER
5M SW WHITEFISH, Flathead, Montana
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
TWIN BRIDGES RD in Flathead, Montana sits above 20% of rated Montana bridges on inventory load rating (23 t), while its 1988 build year is earlier than 42% of Flathead's recorded-year cohort (204 bridges).
TWIN BRIDGES RD in Flathead, Montana is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 1988, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 6. The lowest applicable rating sets the federal condition category, so this Fair 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:S00424015+08491
LATE-CENTURY · STEEL · LONG-SPAN-RUN · DECK-LED · ARTERIAL-ADT · STANDARD-LOAD · CAT-FAIR
- LATE-CENTURY 1980–1999
- STEEL Steel
- LONG-SPAN-RUN 4 spans
- DECK-LED Deck-led
- ARTERIAL-ADT Arterial ADT
- STANDARD-LOAD Standard load
- CAT-FAIR Fair
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: TWIN BRIDGES RD
The TWIN BRIDGES RD bridge in Flathead, Montana carries TWIN BRIDGES RD over STILLWATER RIVER. It was built in 1988, making it 38 years old today. The structure is built primarily of steel continuous and spans 4 sections, stretching 107.5 meters (353 feet) end to end. Daily traffic averages 1,990 vehicles, placing it in the moderately-trafficked tier of Montana bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show a deck rating of 6/9, superstructure at 7/9, substructure at 7/9. The weakest component sits in fair condition. No reported major component scores in the Poor range under the current federal condition thresholds.
How TWIN BRIDGES RD compares
Age against the county: built in 1988, earlier than 86 of Flathead's 204 bridges with a recorded construction year (42%), against a county median build year of 1983. This is one of the newer structures in its county.
Live comparison across Montana bridges with a recorded inventory load rating (5,144 of 5,224 rated).
TWIN BRIDGES RD 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.
Flathead inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 204 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
- 1988
- Material
- Steel Continuous
- Number of Spans
- 4
- Structure Length
- 107.5 m (353 ft)
- Deck Width
- 9.2 m (30 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 1,990 vehicles/day
- Structure Number
- S00424015+08491
Condition Analysis
- • At 6/9, the deck (driving surface) shows fair condition, with minor wear flagged for upkeep.
- • At 7/9, the superstructure (beams and supports above the deck) is in good shape and shows no significant wear.
- • The substructure (piers and abutments) rates good at 7/9, with no significant deterioration on file.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
This page shows what the last federal inspection recorded, not whether TWIN BRIDGES 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 TWIN BRIDGES RD against other structures in Flathead 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 TWIN BRIDGES RD?
TWIN BRIDGES RD in Flathead, Montana has a deck rating of 6/9, superstructure rating of 7/9, and substructure rating of 7/9 on the FHWA's 0–9 scale.
How often is TWIN BRIDGES RD inspected?
TWIN BRIDGES 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 1,990 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. TWIN BRIDGES 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 TWIN BRIDGES RD?
TWIN BRIDGES RD has an NBI inventory load rating of 22.7 metric tons.
Who is responsible for maintaining TWIN BRIDGES RD?
TWIN BRIDGES RD is owned and maintained by State Highway Agency.
How old is TWIN BRIDGES RD and does age affect safety?
TWIN BRIDGES RD was built in 1988, making it 38 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.
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.