County profile · official public datasets

Hawaii County, HI

237 public highway bridges tracked in the FHWA National Bridge Inventory: 44.7% rated Good, 51.1% Fair, 4.2% Poor.

237
Public bridges
44.7%
Good condition
4.2%
Poor condition

The verdict

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

Hawaii County pairs a top-quartile lowest Poor-condition share among rated counties in the state with an older average build year than the state inventory.

Top 25%
lowest Poor share in state
4.2%
Poor-condition share
237
public highway bridges
1956
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.

Hawaii County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Hawaii County ranks #1 of 4 Hawaii counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.2%). Hawaii County, Hawaii contains 237 public highway bridges. Roughly 44.7% are rated “Good,” 51.1% “Fair,” and 4.2% “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

237

Public highway bridges in Hawaii County

Good condition

44.7%

106 of 237 rated 7-9

Fair condition

51.1%

121 of 237 rated 5-6

Poor condition

4.2%

10 of 237 rated 4 or below

In-state Poor-share rank

#1 of 4

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

Condition distribution

Share of 237 NBI-tracked bridges by lowest applicable component rating.

Good
44.7% (106)
Fair
51.1% (121)
Poor
4.2% (10)

Hawaii County's Poor-condition bridges carry 24,405 vehicle crossings a day

That is 1.9% of the county's reported daily bridge traffic on 4.3% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 2,441 crossings a day against 6,753 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 235 of 237 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

77.2% of Hawaii County's bridges have passed the 50-year mark

183 of the 237 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 44.7% 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 39.3% of the county's Poor-condition bridge traffic

PAUAHI ST over PAUAHI ST-WAIOLAMA CANAL, built 1949, carries 9,600 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 10-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 24,405 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Hawaii County's bridges were built

237 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1930s, when 40 of the county's bridges still in the inventory were built, which is 16.9% of those with a recorded year. That cohort is now 85 to 94 years old in the 2024 inventory. Its average build year is 1956, 5 years older than the Hawaii average of 1961.

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

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

The 3 Hawaii counties nearest Hawaii County in number of bridges, with their condition splits. Its 4.2% Poor share is the 1st-lowest of these 4. Its average build year of 1956 against a peer-group mean of 1960 is in line with the group.

Bridge inventory size and condition shares for Hawaii County and the 3 Hawaii counties closest to it in inventory size
County Bridges Poor
Honolulu County 682 6.9%
Hawaii County (this page) 237 4.2%
Maui County 185 5.9%
Kauai County 90 11.1%

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

Similar inventory size

Nearest county inventories outside HI (237 bridges here).

Similar average build year

Nearest mean year-built outside HI (1956 here).

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

All 237 Good 106 Fair 121 Poor 10

Fair-condition bridges (121)

PAAUILO MAUKA RD

Fair

Over: WAIKAALUKU-KAAPAHU GLH

0.5 MI W/KULA KAHIKO RD, Hawaii, HI

Built 1930 Load: 7.8 t ADT: 11

RDWY KAUMALUMALU

Fair

Over: INTERMITTENT STRM

HOLUALOA 4TH N KONA HI, Hawaii, HI

Built 1969 Load: 8.4 t ADT: 1,322

OLD MAMALAHOA HWY

Fair

Over: KAIEIE STRM

0.25 MILE NE/HWY 19, Hawaii, HI

Built 1929 Load: 8.4 t ADT: 1,080

KAIWIKI HMSTD RD

Fair

Over: UNNAMED STREAM

TMK:2-6-11:15, Hawaii, HI

Built 1930 Load: 8.7 t ADT: 10

MAMALAHOA

Fair

Over: WAIKAUMALO STR

TMK 3-2-02:62, Hawaii, HI

Built 1920 Load: 8.7 t ADT: 200

MANIENIE RD

Fair

Over: MANIENIE GULCH

TMK 4-3-012:003, Hawaii, HI

Built 1930 Load: 8.7 t ADT: 50

PIHA KAHUKU

Fair

Over: WAIKAUMALO STREAM

TMK 3-2-004:027, Hawaii, HI

Built 1930 Load: 9.1 t ADT: 200

KALOPA RD

Fair

Over: KALOPA GULCH

TMK 4-4-02:7, Hawaii, HI

Built 1930 Load: 9.1 t ADT: 90

POHAKEA MAUKA RD

Fair

Over: MANIENIE GLH

TMK 4-3-12:13, Hawaii, HI

Built 1930 Load: 9.4 t ADT: 50

KAHOA STREET

Fair

Over: MAILI STREAM

TMK 2-6-012:045, Hawaii, HI

Built 1916 Load: 9.7 t ADT: 530

OLD MAMALAHOA HWY

Fair

Over: MAHUNA GULCH

TMK 4-2-02:19, Hawaii, HI

Built 1930 Load: 9.7 t ADT: 40

OLD MAMALAHOA HWY

Fair

Over: PAHEEHEE STREAM

0.2MI N/HONOMU RD, Hawaii, HI

Built 1929 Load: 10.7 t ADT: 30

OLD MAMALAHOA HWY

Fair

Over: NENUE STREAM

TMK: 3-2-001:011, Hawaii, HI

Built 1930 Load: 11.0 t ADT: 40

HAUOLA ROAD

Fair

Over: WAIPUNAHINA GULCH

TMK 4-3-004:016, Hawaii, HI

Built 1928 Load: 11.3 t ADT: 40

POHAKEA RD

Fair

Over: POHAKUHAKU GULCH

TMK 4-3-006:010, Hawaii, HI

Built 1936 Load: 12.0 t ADT: 40

OLD MAMALAHOA HWY

Fair

Over: HONOKAIA GULCH

1.8MI W/PUNONO RD, Hawaii, HI

Built 1924 Load: 12.0 t ADT: 1,778

MAMALAHOA

Fair

Over: MAMALAHOA RD-HONOLII STR

TMK 2-6-12:34, Hawaii, HI

Built 1911 Load: 12.6 t ADT: 160

KAIWIKI RD

Fair

Over: MAILI STREAM

TMK 2-6-009:010, Hawaii, HI

Built 1900 Load: 13.0 t ADT: 280

OLD MAMALAHOA HWY

Fair

Over: MAMALAHOA/AHUALOA #2

0.1 MI E/KUMUPELE RD, Hawaii, HI

Built 1923 Load: 13.3 t ADT: 800

OLD MAMALAHOA HWY

Fair

Over: UNNAMED STREAM

1.8MI W/PUNONO RD, Hawaii, HI

Built 1924 Load: 13.3 t ADT: 1,778

KAHOA STREET

Fair

Over: KAIWIKI STREAM

TMK 2-6-012:033, Hawaii, HI

Built 1920 Load: 14.3 t ADT: 160

KAAPAHU RD

Fair

Over: WAIKAALULU GULCH

TMK 4-4-09:9, Hawaii, HI

Built 1930 Load: 14.3 t ADT: 40

OLD MAMALAHOA HWY

Fair

Over: KALAOA STRM

0.70 MI NE/HWY 19, Hawaii, HI

Built 1929 Load: 14.6 t ADT: 1,000

MAMALAHOA

Fair

Over: KAHALII STRM

TMK 2-7-10:14, Hawaii, HI

Built 1929 Load: 14.6 t ADT: 500

MAMALAHOA

Fair

Over: KAIWILAHILAHI STRM

TMK 3-5-03:73, Hawaii, HI

Built 1923 Load: 14.6 t ADT: 40

HAWAII BELT RD

Fair

Over: KOLEKOLE STRM

0.10MI W/KOLEKOLE PK RD, Hawaii, HI

Built 1950 Load: 17.2 t ADT: 5,600

HAWAII BELT RD

Fair

Over: WAIAKA STRM

0.08MI E/LINDSAY RD, Hawaii, HI

Built 1932 Load: 17.5 t ADT: 10,300

WAINAKU STREET

Fair

Over: PUKIHAE STREAM

TMK 2-6-005:019, Hawaii, HI

Built 1904 Load: 18.1 t ADT: 3,050

WAINUAKU STREET

Fair

Over: KALALAU STREAM

TMK 2-6-006:022, Hawaii, HI

Built 1920 Load: 18.1 t ADT: 3,020

HAWAII BELT RD

Fair

Over: KEKUALELE STRM

3.54MI E/PAAUILO PLT RD, Hawaii, HI

Built 1935 Load: 18.5 t ADT: 6,700

KALOPA RD

Fair

Over: KAHAWAILIILII GULCH

0.7mi W/Kalopa M Rd, Hawaii, HI

Built 1919 Load: 18.5 t ADT: 90

HAWAII BELT RD

Fair

Over: NINOLE STRM

3.00MI W/KAUNIHO RD, Hawaii, HI

Built 1951 Load: 18.8 t ADT: 6,700

HAWAII BELT RD

Fair

Over: DBL PIPE CLVT(VOLCANO)

0.72MI E/22MI RD, Hawaii, HI

Built 1966 Load: 19.1 t ADT: 7,500

HAWAII BELT RD

Fair

Over: TPL PIPE CLVT(VOLCANO)

1.36MI E/22MI RD, Hawaii, HI

Built 1966 Load: 19.1 t ADT: 7,500

HAWAII BELT RD

Fair

Over: DBL PIPE CLVT(VOLCANO)

1.50MI E/22MI RD, Hawaii, HI

Built 1966 Load: 19.1 t ADT: 7,500

HAWAII BELT RD

Fair

Over: KAHAUPU STRM

0.72MI E/PAKALANA ST, Hawaii, HI

Built 1953 Load: 19.1 t ADT: 7,100

MAMALAHOA HWY

Fair

Over: KEAMUKU STRM

2.13MI S/WAIKALOA, Hawaii, HI

Built 1940 Load: 19.1 t ADT: 5,800

KEAWE ST

Fair

Over: KEAWE ST-WAILUKU RVR

TMK 2-3-05:4, Hawaii, HI

Built 1938 Load: 19.1 t ADT: 2,200

MAMALAHOA

Fair

Over: MAMALAHOA/HAKALAU STRM

TMK 2-9-02:25, Hawaii, HI

Built 1930 Load: 19.8 t ADT: 20

HAWAII BELT RD

Fair

Over: KAHOLO STRM

1.68MI W/OOKALA ACC RD, Hawaii, HI

Built 1935 Load: 20.1 t ADT: 6,700

WAIANUENUE AVE

Fair

Over: PIIHONUA-WAILUKU RIVER

TMK 2-5-28:17, Hawaii, HI

Built 1970 Load: 20.1 t ADT: 370

HAWAII BELT RD

Fair

Over: KAALA STRM

3.93MI E/PAAUILO PLT RD, Hawaii, HI

Built 1935 Load: 20.4 t ADT: 6,700

KALOPA RD

Fair

Over: WAIKAALULU GULCH

TMK 4-4-02:6, Hawaii, HI

Built 1930 Load: 21.7 t ADT: 40

MAMALAHOA

Fair

Over: MAMALAHOA/NIENIE GLH

70-FT E/KINIMAKA RD, Hawaii, HI

Built 1923 Load: 22.0 t ADT: 800

HAWAII BELT RD

Fair

Over: WAILUKU STRM

0.16MI W/WAINUENUE ST, Hawaii, HI

Built 1950 Load: 22.4 t ADT: 15,600

HAWAII BELT RD

Fair

Over: PAHOEHOE STRM

0.62MI W/KUIKAHI RD, Hawaii, HI

Built 1912 Load: 22.7 t ADT: 13,600

PLANTATION RD

Fair

Over: OOKALA PLT OP-HI BLT RD

0.80MI W/OOKALA ACC RD, Hawaii, HI

Built 1959 Load: 23.0 t ADT: 1

OLD MAMALAHOA HWY

Fair

Over: HONOKAIA GULCH

1.0MI W/PUNONO RD, Hawaii, HI

Built 1924 Load: 23.3 t ADT: 1,778

HAWAII BELT RD

Fair

Over: KUPAPAULUA STRM

1.50MI W/OOKALA ACC RD, Hawaii, HI

Built 1935 Load: 23.7 t ADT: 6,700

HAWAII BELT RD

Fair

Over: KUKAIAU STRM

2.88MI E/PLT RD, Hawaii, HI

Built 1951 Load: 24.0 t ADT: 6,700

Read our methodology - how this data is sourced, computed, and verified.

Related

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.