County profile · official public datasets

Maui County, HI

185 public highway bridges tracked in the FHWA National Bridge Inventory: 33.5% rated Good, 60.5% Fair, 5.9% Poor.

185
Public bridges: 33.5%
Good condition: 5.9%
Poor condition

The verdict

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

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

Top 50%
lowest Poor share in state: 5.9%
Poor-condition share: 185
public highway bridges: 1958
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.

Maui County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Maui County ranks #2 of 4 Hawaii counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 5.9%). Maui County, Hawaii contains 185 public highway bridges. Roughly 33.5% are rated “Good,” 60.5% “Fair,” and 5.9% “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

185

Public highway bridges in Maui County

Good condition

33.5%

62 of 185 rated 7-9

Fair condition

60.5%

112 of 185 rated 5-6

Poor condition

5.9%

11 of 185 rated 4 or below

In-state Poor-share rank

#2 of 4

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

Condition distribution

Share of 185 NBI-tracked bridges by lowest applicable component rating.

Good

33.5% (62)

Fair

60.5% (112)

Poor

5.9% (11)

Maui County's Poor-condition bridges carry 11,244 vehicle crossings a day

That is 0.7% of the county's reported daily bridge traffic on 6% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 1,022 crossings a day against 9,380 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 183 of 185 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

63.2% of Maui County's bridges have passed the 50-year mark

117 of the 185 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 33.5% 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 16% of the county's Poor-condition bridge traffic

HANA HWY over NAILIILIHAELE STRM, built 1930, carries 1,800 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 11-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 11,244 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1900s

1
1910s

29
1920s

27
1930s

23
1940s

9
1950s

9
1960s

12
1970s

12
1980s

14
1990s

6
2000s

27
2010s

15
2020s

1

What this shows Construction peaked in the 1910s, when 29 of the county's bridges still in the inventory were built, which is 15.7% of those with a recorded year. That cohort is now 105 to 114 years old in the 2024 inventory. Its average build year (1958) matches the Hawaii average (1961).

How Maui County compares with Hawaii's closest counties by inventory size

The 3 Hawaii counties nearest Maui County in number of bridges, with their condition splits. Its 5.9% Poor share is the 2nd-lowest of these 4. Its average build year of 1958 against a peer-group mean of 1959 is in line with the group.

Bridge inventory size and condition shares for Maui County and the 3 Hawaii counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Honolulu County	682	35.8%	57.3%	6.9%	1963
Hawaii County	237	44.7%	51.1%	4.2%	1956
Maui County (this page)	185	33.5%	60.5%	5.9%	1958
Kauai County	90	36.7%	52.2%	11.1%	1959

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

Similar inventory size

Nearest county inventories outside HI (185 bridges here).

Chambers County, AL · 185 bridges
Lawrence County, IL · 185 bridges
Saline County, IL · 185 bridges
Cass County, IN · 185 bridges

Similar average build year

Nearest mean year-built outside HI (1958 here).

Middlesex County, MA · avg 1958 · 818 bridges
Bucks County, PA · avg 1958 · 699 bridges
Butte County, CA · avg 1958 · 437 bridges
Cowley County, KS · avg 1958 · 337 bridges

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

All 185 Good 62 Fair 112 Poor 11

All bridges (185)

Sort:

Maui County Bridge Snapshot

Condition distribution

Maui County's Poor-condition bridges carry 11,244 vehicle crossings a day

63.2% of Maui County's bridges have passed the 50-year mark

One structure carries 16% of the county's Poor-condition bridge traffic

How Maui County compares with Hawaii'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 (185)

HANA HWY

HANA HWY/KAHOLOPO

Lahaina Bypass

Hana Hwy

Hana Hwy

Lahaina Bypass

Lahaina Bypass

Hana Hwy

Hana Hwy

Hana Hwy

Hana Hwy

Lahaina Bypass Hwy

Honoapiilani Bypas

HONOAPIILANI HWY

MAUNALOA HWY

Lahaina Bypass

Lahaina Bypass

KAM V HWY

HALEAKALA HIGHWAY

HALEAKALA HIGHWAY

Lahainaluna Rd

Haleakala Hwy

HANA HWY

Hana Hwy

HANA HWY

HAIKU RD

HANA HWY

HANA HWY

HANA HWY

HANA HWY

HANA HWY

HANA HWY

HANA HWY

HANA HWY

PIILANI HWY

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