Total bridges
5
Public highway bridges in Dukes County
County profile · official public datasets
Dukes County, MA
5 public highway bridges tracked in the FHWA National Bridge Inventory: 80% rated Good, 20% Fair, 0% Poor.
- 5
- Public bridges
- 80%
- Good condition
- 0%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Dukes County pairs a top-10% lowest Poor-condition share among rated counties in the state with a newer average build year than the state inventory.
- Top 8%
- lowest Poor share in state
- 0%
- Poor-condition share
- 5
- public highway bridges
- 2006
- avg year built
Poor is an FHWA condition category from the lowest applicable component rating (4 or below), not a live crossing-safety or closure decision. Rankings cover counties with at least five public highway bridges.
Dukes County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Dukes County ranks #1 of 13 Massachusetts counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 0%). Dukes County, Massachusetts contains 5 public highway bridges. Roughly 80% are rated “Good,” 20% “Fair,” and 0% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.
Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.
Source: FHWA National Bridge Inventory. See methodology for full definitions.
Good condition
80%
4 of 5 rated 7-9
Fair condition
20%
1 of 5 rated 5-6
Poor condition
0%
0 of 5 rated 4 or below
In-state Poor-share rank
#1 of 13
Among Massachusetts counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 5 NBI-tracked bridges by lowest applicable component rating.
Good 80% (4)
Fair 20% (1)
Poor 0% (0)
0% of Dukes County's bridges have passed the 50-year mark
0 of the 5 bridges with a recorded construction year were built in 1974 or earlier. Age alone is not a defect: a well-maintained older bridge can rate Good, and 80% of this county's inventory does. Even so, this older cohort is the population from which future Poor ratings are drawn, which is why the age profile below matters alongside the condition split above.
Cutoff derives from the 2024 release year minus a 50-year design life. Source: FHWA National Bridge Inventory, 2024 release.
When Dukes County's bridges were built
5 bridges with a recorded construction year, grouped by decade
- 1990s
1990–1999
2 bridges
- 2010s
2010–2019
3 bridges
What this shows Construction peaked in the 2010s, when 3 of the county's bridges still in the inventory were built, which is 60% of those with a recorded year. That cohort is now 5 to 14 years old in the 2024 inventory. Its average build year is 2006, 45 years newer than the Massachusetts average of 1961.
How Dukes County compares with Massachusetts's closest counties by inventory size
The 5 Massachusetts counties nearest Dukes County in number of bridges, with their condition splits. Its 0% Poor share is the 1st-lowest of these 6. Its average build year of 2006 against a peer-group mean of 1962 is 44 years newer.
Showing the 5 closest of 12 Massachusetts counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Norfolk County | 343 | 23.6% | 71.4% | 5% | 1962 |
| Franklin County | 314 | 34.4% | 54.5% | 11.1% | 1964 |
| Plymouth County | 287 | 30.7% | 63.4% | 5.9% | 1960 |
| Hampshire County | 259 | 25.1% | 66% | 8.9% | 1959 |
| Barnstable County | 107 | 35.5% | 61.7% | 2.8% | 1965 |
| Dukes County (this page) | 5 | 80% | 20% | 0% | 2006 |
Each share is of that county's own total tracked bridges; peers are the counties with 5 or more bridges whose inventory size is closest to Dukes County's. Source: FHWA National Bridge Inventory, 2024 release.
Fair-condition bridges (1)
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges
Every figure on PlainBridges 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. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.