County profile · official public datasets

Pima County, AZ

1,150 public highway bridges tracked in the FHWA National Bridge Inventory: 68.2% rated Good, 31% Fair, 0.8% Poor.

1,150
Public bridges: 68.2%
Good condition: 0.8%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Pima County posts a better-than-median Poor-condition share among rated counties in the state across large county bridge inventory.

Top 27%
lowest Poor share in state: 0.8%
Poor-condition share: 1,150
public highway bridges: 1979
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.

Pima County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Pima County ranks #4 of 15 Arizona counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 0.8%). Pima County, Arizona contains 1,150 public highway bridges. Roughly 68.2% are rated “Good,” 31% “Fair,” and 0.8% “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

1,150

Public highway bridges in Pima County

Good condition

68.2%

784 of 1,150 rated 7-9

Fair condition

31%

357 of 1,150 rated 5-6

Poor condition

0.8%

9 of 1,150 rated 4 or below

In-state Poor-share rank

#4 of 15

Among Arizona counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 1,150 NBI-tracked bridges by lowest applicable component rating.

Good

68.2% (784)

Fair

31% (357)

Poor

0.8% (9)

Pima County's Poor-condition bridges carry 47,139 vehicle crossings a day

That is 0.3% of the county's reported daily bridge traffic on 0.8% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 5,238 crossings a day against 16,893 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 1,150 of 1,150 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

42.4% of Pima County's bridges have passed the 50-year mark

488 of the 1,150 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 68.2% 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 84.4% of the county's Poor-condition bridge traffic

22nd Street over SPRR; Aviation Hwy, built 1966, carries 39,799 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 9-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 47,139 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1900s

3
1910s

1
1920s

12
1930s

45
1940s

35
1950s

81
1960s

215
1970s

162
1980s

246
1990s

130
2000s

107
2010s

106
2020s

7

What this shows Construction peaked in the 1980s, when 246 of the county's bridges still in the inventory were built, which is 21.4% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year (1979) matches the Arizona average (1977).

How Pima County compares with Arizona's closest counties by inventory size

The 5 Arizona counties nearest Pima County in number of bridges, with their condition splits. Its 0.8% Poor share is the 3rd-lowest of these 6. Its average build year of 1979 against a peer-group mean of 1969 is 10 years newer.

Showing the 5 closest of 14 Arizona counties eligible for comparison.

Bridge inventory size and condition shares for Pima County and the 5 Arizona counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Pima County (this page)	1,150	68.2%	31%	0.8%	1979
Pinal County	716	63.5%	35.5%	1%	1973
Mohave County	641	71.6%	27.8%	0.6%	1976
Yavapai County	543	63.2%	36.3%	0.6%	1970
Cochise County	501	55.3%	42.5%	2.2%	1956
Coconino County	405	51.9%	46.9%	1.2%	1969

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 Pima 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 Pima County, both outside Arizona so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside AZ (1,150 bridges here).

Clark County, NV · 1,141 bridges
Orange County, CA · 1,164 bridges
Tulsa County, OK · 1,135 bridges
Williamson County, TX · 1,170 bridges

Similar average build year

Nearest mean year-built outside AZ (1979 here).

Jefferson County, KY · avg 1979 · 662 bridges
Spartanburg County, SC · avg 1979 · 638 bridges
McPherson County, KS · avg 1979 · 586 bridges
Madison County, IL · avg 1979 · 523 bridges

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 1,150 Good 784 Fair 357 Poor 9

All bridges (1,150)

Sort:

Pima County Bridge Snapshot

Condition distribution

Pima County's Poor-condition bridges carry 47,139 vehicle crossings a day

42.4% of Pima County's bridges have passed the 50-year mark

One structure carries 84.4% of the county's Poor-condition bridge traffic

How Pima County compares with Arizona's closest counties by inventory size

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

All bridges (1,150)

IRR BIA RTE 15

IRR BIA RTE 34

IRR BIA 15

IRR BIA 16

IRR BIA 16

IRR BIA 16

IRR BIA RTE 34

IRR BIA RTE 34

IRR BIA RTE 34

IRR BIA 34

IRR BIA RTE 34

IRR BIA RTE 34

IRR BIA RTE 34

IRR BIA RTE 34

IRR BIA RTE 34

IRR BIA RTE 34

IRR BIA RTE 23

IRR BIA RTE 23

BIA IRR 21

BIA IRR 21

BIA IRR 21

I 10;WB

I 10; EB

IRR I 19; NB

IRR I 19; SB

I 19; NB

I 19; SB

I-10 EB & WB

IRR SR 85

IRR SR 85

IRR SR 86

IRR SR 86

IRR SR 86

IRR SR 86

SR 86

IRR SR 86

IRR SR 86

IRR SR 86

SR 77

I 19; NB & SB

I 19; NB

IRR I 19; NB & SB

IRR I 19; NB & SB

IRR I 19; NB

IRR I 19; SB

IRR SR 286

IRR SR 286

IRR SR 286

IRR SR 86

SR 86

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