County profile · official public datasets

Coconino County, AZ

405 public highway bridges tracked in the FHWA National Bridge Inventory: 51.9% rated Good, 46.9% Fair, 1.2% Poor.

405
Public bridges: 51.9%
Good condition: 1.2%
Poor condition

The verdict

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

Coconino County pairs a better-than-median Poor-condition share among rated counties in the state with an older average build year than the state inventory.

Top 40%
lowest Poor share in state: 1.2%
Poor-condition share: 405
public highway bridges: 1969
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.

Coconino County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Coconino County ranks #6 of 15 Arizona counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 1.2%). Coconino County, Arizona contains 405 public highway bridges. Roughly 51.9% are rated “Good,” 46.9% “Fair,” and 1.2% “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

405

Public highway bridges in Coconino County

Good condition

51.9%

210 of 405 rated 7-9

Fair condition

46.9%

190 of 405 rated 5-6

Poor condition

1.2%

5 of 405 rated 4 or below

In-state Poor-share rank

#6 of 15

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

Condition distribution

Share of 405 NBI-tracked bridges by lowest applicable component rating.

Good

51.9% (210)

Fair

46.9% (190)

Poor

1.2% (5)

Coconino County's Poor-condition bridges carry 9,413 vehicle crossings a day

That is 0.3% of the county's reported daily bridge traffic on 1.2% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,883 crossings a day against 6,951 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 405 of 405 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

61.5% of Coconino County's bridges have passed the 50-year mark

249 of the 405 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 51.9% 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 49.1% of the county's Poor-condition bridge traffic

SR 64 over Red Lake Wash, built 1936, carries 4,618 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 9,413 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1900s

5
1910s

1
1920s

5
1930s

54
1940s

19
1950s

52
1960s

92
1970s

37
1980s

50
1990s

36
2000s

23
2010s

26
2020s

5

What this shows Construction peaked in the 1960s, when 92 of the county's bridges still in the inventory were built, which is 22.7% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year is 1969, 8 years older than the Arizona average of 1977.

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

The 5 Arizona counties nearest Coconino County in number of bridges, with their condition splits. Its 1.2% Poor share is the 2nd-lowest of these 6. Its average build year of 1969 against a peer-group mean of 1966 is in line with the group.

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

Bridge inventory size and condition shares for Coconino County and the 5 Arizona counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Yavapai County	543	63.2%	36.3%	0.6%	1970
Cochise County	501	55.3%	42.5%	2.2%	1956
Coconino County (this page)	405	51.9%	46.9%	1.2%	1969
La Paz County	306	64.1%	32.4%	3.6%	1961
Navajo County	277	52.7%	45.1%	2.2%	1972
Yuma County	262	50.4%	47.7%	1.9%	1973

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

Similar inventory size

Nearest county inventories outside AZ (405 bridges here).

Hidalgo County, TX · 405 bridges
Hill County, TX · 405 bridges
Johnson County, TX · 404 bridges
Pottawatomie County, OK · 408 bridges

Similar average build year

Nearest mean year-built outside AZ (1969 here).

Cook County, IL · avg 1969 · 1,721 bridges
Fresno County, CA · avg 1969 · 916 bridges
Cuyahoga County, OH · avg 1969 · 871 bridges
Ventura County, CA · avg 1969 · 501 bridges

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

All 405 Good 210 Fair 190 Poor 5

All bridges (405)

Sort:

Coconino County Bridge Snapshot

Condition distribution

Coconino County's Poor-condition bridges carry 9,413 vehicle crossings a day

61.5% of Coconino County's bridges have passed the 50-year mark

One structure carries 49.1% of the county's Poor-condition bridge traffic

How Coconino 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 (405)

IRR BIA RTE 18

IRR BIA RTE 18

IRR BIA RTE N15

IRR BIA RTE N16

IRR BIA RTE N16

IRR US 89

Garland Prarie Rd

Parks Road

Transwestern Road

Woody Mt Road

Woody Mt Road

Cosnino Road

I 40; EB

I 40; WB

Country Club Road

I 17 Northbound

I 17 SB

SR 87

IRR US 89

SR A 89

IRR US 89A

IRR US 89A

IRR US A 89

IRR US 89

IRR US 89

Fremont Boulevard

Aspen Avenue

Acacia Drive

OLD B40

IRR BIA RTE N6732

I 40; EB

I 40; EB

I 40; WB

I 40; WB

Route 66

J W Powell Rd

I 40; EB

SR 99

IRR US 89

FDR 610

I 40; WB

I-40 WB

I 40; WB

I 40 EB

Winona Road

IRR BIA RTE N6923

I 40; EB

I 40 FR

I-40 WB

Twin Arrows Road

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