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.

Total bridges

202

Public highway bridges in San Juan County

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.

pre-1900

1
1920s

1
1930s

2
1940s

8
1950s

31
1960s

28
1970s

59
1980s

9
1990s

22
2000s

17
2010s

13
2020s

11

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.

Bridge inventory size and condition shares for San Juan County and the 5 Puerto Rico counties closest to it in inventory size
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 202 Good 45 Fair 138 Poor 19

Fair-condition bridges (138)

Sort:

San Juan County Bridge Snapshot

Condition distribution

San Juan County's Poor-condition bridges carry 1,151,399 vehicle crossings a day

39.6% of San Juan County's bridges have passed the 50-year mark

One structure carries 22.7% of the county's Poor-condition bridge traffic

How San Juan County compares with Puerto Rico's closest counties by inventory size

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

Fair-condition bridges (138)

RAMP PR 18 TO PR17

GARAGE ACCESS ROAD

PR 1

ASHFORD AVE.

PR 838

OLOT STREET

11 S.W. STREET

54 S.E. STREET

4 STREET

PR 21 WESTBOUND

RAMP PR 1 TO PR 22

PR 22

PR 1

CIPRESES STREET

OFF PR 176

WINSTON CHURCHILL

PR 1

ANDALUCIA STREET

PR 26

PR 177

PR 1

RAMP TO PR 26 &amp

RAMP TO PR 52

RAMP PR 26 TO PR22

RAMP PR 22 TO PR 1

PR 18 NORTHBOUND

PR 35

RAMP PR181 TO PR17

PR 199 - KM 11.2

PR 199

PR 26

PR 26

URDIALES STREET

PR 26

RAMP FROM PR 26

PR 17

PR 17 WESTBOUND

PR 26

PR 22 NORTHBOUND

PR 27 (BARBOSA AV)

PR 1 (MU&#165;OZ R

MODESTA STREET

PR 2

PR 26

PR 22 WESTBOUND

PR 22 EASTBOUND

OFF PR 834

PR 22

PR 26

PR 2

Related

PR 1 (MU¥OZ R