County profile · official public datasets

Yuma County, AZ

262 public highway bridges tracked in the FHWA National Bridge Inventory: 50.4% rated Good, 47.7% Fair, 1.9% Poor.

262
Public bridges: 50.4%
Good condition: 1.9%
Poor condition

The verdict

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

Yuma County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.

8th
of 15 on Poor share: 1.9%
Poor-condition share: 262
public highway bridges: 1973
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.

Yuma County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Yuma County ranks #8 of 15 Arizona counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 1.9%). Yuma County, Arizona contains 262 public highway bridges. Roughly 50.4% are rated “Good,” 47.7% “Fair,” and 1.9% “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

262

Public highway bridges in Yuma County

Good condition

50.4%

132 of 262 rated 7-9

Fair condition

47.7%

125 of 262 rated 5-6

Poor condition

1.9%

5 of 262 rated 4 or below

In-state Poor-share rank

#8 of 15

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

Condition distribution

Share of 262 NBI-tracked bridges by lowest applicable component rating.

Good

50.4% (132)

Fair

47.7% (125)

Poor

1.9% (5)

Yuma County's Poor-condition bridges carry 13,348 vehicle crossings a day

That is 1% of the county's reported daily bridge traffic on 1.9% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 2,670 crossings a day against 3,917 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 262 of 262 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

56.9% of Yuma County's bridges have passed the 50-year mark

149 of the 262 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 50.4% 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 62.6% of the county's Poor-condition bridge traffic

I 8 EB over Colo R Pentntry Av SPTCO, built 1978, carries 8,350 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 5-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 13,348 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1910s

1
1920s

4
1930s

23
1940s

8
1950s

18
1960s

91
1970s

15
1980s

30
1990s

41
2000s

17
2010s

6
2020s

8

What this shows Construction peaked in the 1960s, when 91 of the county's bridges still in the inventory were built, which is 34.7% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1973) matches the Arizona average (1977).

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

The 5 Arizona counties nearest Yuma County in number of bridges, with their condition splits. Its 1.9% Poor share is the 1st-lowest of these 6. Its average build year of 1973 against a peer-group mean of 1967 is 6 years newer.

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

Bridge inventory size and condition shares for Yuma County and the 5 Arizona counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
La Paz County	306	64.1%	32.4%	3.6%	1961
Navajo County	277	52.7%	45.1%	2.2%	1972
Yuma County (this page)	262	50.4%	47.7%	1.9%	1973
Apache County	259	48.3%	45.9%	5.8%	1973
Gila County	259	60.2%	37.5%	2.3%	1975
Graham County	179	44.1%	52%	3.9%	1954

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

Similar inventory size

Nearest county inventories outside AZ (262 bridges here).

Rice County, KS · 262 bridges
Washtenaw County, MI · 262 bridges
Lavaca County, TX · 262 bridges
Albemarle County, VA · 262 bridges

Similar average build year

Nearest mean year-built outside AZ (1973 here).

Jefferson County, AL · avg 1973 · 1,068 bridges
Erie County, NY · avg 1973 · 906 bridges
Davidson County, TN · avg 1973 · 832 bridges
Lancaster County, PA · avg 1973 · 801 bridges

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

All 262 Good 132 Fair 125 Poor 5

Good-condition bridges (132)

Sort:

Yuma County Bridge Snapshot

Condition distribution

Yuma County's Poor-condition bridges carry 13,348 vehicle crossings a day

56.9% of Yuma County's bridges have passed the 50-year mark

One structure carries 62.6% of the county's Poor-condition bridge traffic

How Yuma 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

Good-condition bridges (132)

I 8; WB

16th Street

N Frontage Road

SB 8

I-8 WB

US 95

US 95

US 95

US 95

US 95

US 95

US 95

US 95

US 95

I 8; EB

I 8; EB & WB

US 95

8th Street

1st Street

Avenue 21E

I 8; EB & WB

4th Ave Ext

Ave 33E

Old SR 80

48th St Frt Rd

Foothills Blvd

Williams Street

Ave 4E

Arizona Avenue

San Jose Avenue

Oakland Avenue

I 8; EB & WB

Avenue 7E

Avenue 38E

Ave 28E

Avenue 45E

Co. 17th Street

30th Street

O&M Service Road

Ave 12E

Ave 2E

Avenue 37E

8th Street

Main Street

Avenue 20E

Fortuna Rd

Avenue 40E

Avenue 38E

Avenue 22E

Ave 6E

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