Total bridges
2
Public highway bridges in Nantucket County
County profile · official public datasets
Nantucket County, MA
2 public highway bridges tracked in the FHWA National Bridge Inventory: 0% rated Good, 100% Fair, 0% Poor.
- 2
- Public bridges
- 0%
- Good condition
- 0%
- Poor condition
Nantucket County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Nantucket County, Massachusetts contains 2 public highway bridges. Roughly 0% are rated “Good,” 100% “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.
Nantucket County is too small a bridge inventory (2 bridges) for a reliable Poor-share ordinal against Massachusetts's other counties, but its bridges make up <0.1% of Massachusetts's 5,295 total public highway bridges in the FHWA inventory.
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
0%
0 of 2 rated 7-9
Fair condition
100%
2 of 2 rated 5-6
Poor condition
0%
0 of 2 rated 4 or below
Condition distribution
Share of 2 NBI-tracked bridges by lowest applicable component rating.
Good 0% (0)
Fair 100% (2)
Poor 0% (0)
50% of Nantucket County's bridges have passed the 50-year mark
1 of the 2 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 0% 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 Nantucket County's bridges were built
2 bridges with a recorded construction year, grouped by decade
- 1940s
1940–1949
1 bridges
- 1980s
1980–1989
1 bridges
What this shows Construction peaked in the 1940s, when 1 of the county's bridges still in the inventory were built, which is 50% of those with a recorded year. That cohort is now 75 to 84 years old in the 2024 inventory. Its average build year (1964) matches the Massachusetts average (1961).
Fair-condition bridges (2)
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.