Total bridges
202
Public highway bridges in San Juan County
County profile · official public datasets
San Juan County, PR
202 public highway bridges tracked in the FHWA National Bridge Inventory: 22.3% rated Good, 68.3% Fair, 9.4% Poor.
- 202
- Public bridges
- 22.3%
- Good condition
- 9.4%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
San Juan County posts a top-quartile lowest Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- Top 19%
- lowest Poor share in state
- 9.4%
- Poor-condition share
- 202
- public highway bridges
- 1978
- 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.
San Juan County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, San Juan County ranks #14 of 74 Puerto Rico counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 9.4%). San Juan County, Puerto Rico contains 202 public highway bridges. Roughly 22.3% are rated “Good,” 68.3% “Fair,” and 9.4% “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
22.3%
45 of 202 rated 7-9
Fair condition
68.3%
138 of 202 rated 5-6
Poor condition
9.4%
19 of 202 rated 4 or below
In-state Poor-share rank
#14 of 74
Among Puerto Rico counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 202 NBI-tracked bridges by lowest applicable component rating.
Good 22.3% (45)
Fair 68.3% (138)
Poor 9.4% (19)
San Juan County's Poor-condition bridges carry 1,151,399 vehicle crossings a day
That is 11.7% of the county's reported daily bridge traffic on 9.4% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 60,600 crossings a day against 52,238 for a Good-condition one. A Poor rating is a condition category, not a closure or a live safety judgement; it means the lowest applicable component rating is 4 or below.
Computed over the 202 of 202 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
39.6% of San Juan County's bridges have passed the 50-year mark
80 of the 202 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 22.3% 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.
One structure carries 22.7% of the county's Poor-condition bridge traffic
PR 18 over PR 23 (ROOSEVELT AV.), built 1967, carries 261,400 vehicles a day, the most of any Poor-rated structure here. The county's Poor-condition exposure is concentrated rather than evenly spread, so the 19-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 1,151,399 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When San Juan County's bridges were built
202 bridges with a recorded construction year, grouped by decade
- pre-1900 1
Built before 1900
1 bridges
- 1920s 1
1920–1929
1 bridges
- 1930s 2
1930–1939
2 bridges
- 1940s 8
1940–1949
8 bridges
- 1950s
1950–1959
31 bridges
- 1960s
1960–1969
28 bridges
- 1970s
1970–1979
59 bridges
- 1980s 9
1980–1989
9 bridges
- 1990s 22
1990–1999
22 bridges
- 2000s 17
2000–2009
17 bridges
- 2010s 13
2010–2019
13 bridges
- 2020s 11
2020–2029
11 bridges
What this shows Construction peaked in the 1970s, when 59 of the county's bridges still in the inventory were built, which is 29.2% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year (1978) matches the Puerto Rico average (1974).
How San Juan County compares with Puerto Rico's closest counties by inventory size
The 5 Puerto Rico counties nearest San Juan County in number of bridges, with their condition splits. Its 9.4% Poor share is the 1st-lowest of these 6. Its average build year of 1978 against a peer-group mean of 1975 is in line with the group.
Showing the 5 closest of 73 Puerto Rico counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| San Juan County (this page) | 202 | 22.3% | 68.3% | 9.4% | 1978 |
| Ponce County | 123 | 18.7% | 65.9% | 15.4% | 1984 |
| Caguas County | 92 | 10.9% | 78.3% | 10.9% | 1965 |
| Cayey County | 81 | 6.2% | 82.7% | 11.1% | 1967 |
| Bayamón County | 78 | 14.1% | 75.6% | 10.3% | 1977 |
| Carolina County | 73 | 28.8% | 60.3% | 11% | 1983 |
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 San Juan County's. Source: FHWA National Bridge Inventory, 2024 release.
Nationwide counties with similar inventory size or average build year
Two NBI-derived peer sets for San Juan County, both outside Puerto Rico so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside PR (202 bridges here).
- Elmore County, AL · 202 bridges
- Clark County, AR · 202 bridges
- St. Francis County, AR · 202 bridges
- Floyd County, GA · 202 bridges
Similar average build year
Nearest mean year-built outside PR (1978 here).
- Orange County, CA · avg 1978 · 1,164 bridges
- Sumner County, KS · avg 1978 · 659 bridges
- Allen County, IN · avg 1978 · 613 bridges
- Livingston County, IL · avg 1978 · 579 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
All bridges (202)
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.