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)

LINDSEY RD

Fair

Over: WAIKOLOA STREAM

TMK:6-5-03&05, Hawaii, HI

Built 1969 Load: 24.0 t ADT: 2,200

HAWAII BELT RD

Fair

Over: PANAEWA STRM

.035MI S/PALAI ST, Hawaii, HI

Built 1950 Load: 24.3 t ADT: 32,300

HONOKAA-WAIPIO RD

Fair

Over: KAHAUPU STRM

0.19MI W/MAMALAHOA HWY, Hawaii, HI

Built 1953 Load: 24.5 t ADT: 2,700

HAWAII BELT RD

Fair

Over: HONOLII STRM

0.11MI E/PAUKAA DR, Hawaii, HI

Built 1936 Load: 24.6 t ADT: 12,900

OLD MAMALAHOA HWY

Fair

Over: UMAUMA STREAM

TMK 3-1-01:27, Hawaii, HI

Built 1920 Load: 24.9 t ADT: 980

HAWAII BELT RD

Fair

Over: KAULA STRM

0.89MI W/OLD MAMALAHOAHWY, Hawaii, HI

Built 1959 Load: 25.3 t ADT: 6,700

SADDLE RD

Fair

Over: UNMD STRM(53 MI BR)

TMK:6-7-01, Hawaii, HI

Built 1942 Load: 25.6 t ADT: 1,020

HONOKAA-WAIPIO RD

Fair

Over: KAWAIKALIA STRM

2.4 MI E/ MUD LN, Hawaii, HI

Built 1967 Load: 27.2 t ADT: 1,400

AKONI PULE HWY

Fair

Over: WALAOHIA GULCH

1.56mi E/Maulili Lp, Hawaii, HI

Built 1919 Load: 27.2 t ADT: 3,500

AKONI PULE HWY

Fair

Over: AAMAKOA GULCH

2.08MI E/MAULILI LP, Hawaii, HI

Built 1918 Load: 27.2 t ADT: 1,300

HAWAII BELT RD

Fair

Over: NIENIE STRM

0.98MI W/PAKALANA ST, Hawaii, HI

Built 1963 Load: 27.9 t ADT: 8,600

HAWAII BELT RD

Fair

Over: MANOWAIOPAE STRM

4.24MI W/OOKALA ACC RD, Hawaii, HI

Built 1957 Load: 28.2 t ADT: 6,700

KILAUEA AVE

Fair

Over: WAILOA STRM

TMK: 2-2-020:013, Hawaii, HI

Built 1964 Load: 28.2 t ADT: 21,730

KAWAIHAE-MAHUKONA

Fair

Over: UNMD STRM-DBL MTL CULVT

8.17MI N/MALUOKALANI ST, Hawaii, HI

Built 1966 Load: 29.0 t ADT: 3,100

OLD MAMALAHOA HWY

Fair

Over: KEAAKAUKAU GULCH

0.4 MI W/PUAONO RD, Hawaii, HI

Built 1925 Load: 29.2 t ADT: 600

HAWAII BELT RD

Fair

Over: WAIPUNAHINA STRM

5.00MI E/MAMANE ST, Hawaii, HI

Built 1959 Load: 29.5 t ADT: 7,200

KILAUEA AVE

Fair

Over: 4-MILE CREEK

2-2-048:001, Hawaii, HI

Built 1964 Load: 29.8 t ADT: 3,210

KAAPAHU HMSTD RD

Fair

Over: KALOPA GULCH

TMK 4-4-08:2, Hawaii, HI

Built 1919 Load: 29.8 t ADT: 40

PLANTATION RD

Fair

Over: HAWAII BELT RD

0.05MI W/HAU LANE, Hawaii, HI

Built 1949 Load: 30.8 t

HONOKAA-WAIPIO RD

Fair

Over: WAIULILI STRM

0.44MI/WAIPIO VLLY LO PT, Hawaii, HI

Built 1979 Load: 30.8 t ADT: 710

AKONI PULE HWY

Fair

Over: HALELUA GLH-DBL MTL CULV

3.69MI E/HAWI JCT, Hawaii, HI

Built 1981 Load: 30.8 t ADT: 3,500

PANIOLO ST

Fair

Over: AUWAIAKEAKUA GLH

TMK 6-8-03:3, Hawaii, HI

Built 1970 Load: 32.1 t ADT: 100

HAWAII BELT RD

Fair

Over: KAALUU STRM

6.11MI E/OOKALA ACC RD, Hawaii, HI

Built 1933 Load: 32.4 t ADT: 6,700

HAWAII BELT RD

Fair

Over: MANOLOA STRM

3.33MI W/KAUNIHO RD, Hawaii, HI

Built 1951 Load: 32.4 t ADT: 6,700

QUEEN KAAHUMANU H

Fair

Over: UNNAMED GULLY

1.48MI N/KEAHOLE AIR ACC, Hawaii, HI

Built 1974 Load: 32.7 t ADT: 13,400

QUEEN KAAHUMANU H

Fair

Over: UNNAMED GULLY

6.88MI N/KEAHOLE AIR ACC, Hawaii, HI

Built 1974 Load: 32.7 t ADT: 13,400

QUEEN KAAHUMANU H

Fair

Over: UNNAMED GULLY

8.67MI N/KEAHOLE AIR, Hawaii, HI

Built 1974 Load: 32.7 t ADT: 13,400

QUEEN KAAHUMANU H

Fair

Over: UNNAMED GULLY

19.70MI N/KEAHOLE AIR ACC, Hawaii, HI

Built 1974 Load: 32.7 t ADT: 13,200

QUEEN KAAHUMANU H

Fair

Over: UNMD GLH. AUWAIAKEAKUA

20 99MI N/KEAHOLE AIR ACC, Hawaii, HI

Built 1974 Load: 32.7 t ADT: 13,200

QUEEN KAAHUMANU H

Fair

Over: UNNAMED GULLY

21.12MI N/KEAHOLE AIR ACC, Hawaii, HI

Built 1974 Load: 32.7 t ADT: 13,200

QUEEN KAAHUMANU H

Fair

Over: KAMAKOA GULCH

22.28MI N/KEAHOLE AIR ACC, Hawaii, HI

Built 1974 Load: 32.7 t ADT: 13,200

KOHALA MTN RD

Fair

Over: KAWAIHAE STRM(TPL BOX)

6.82MI N/KAWAIHAE RD, Hawaii, HI

Built 1953 Load: 32.7 t ADT: 2,400

HAWAII BELT RD

Fair

Over: KUWAIKAHI STRM

4.41MI E/OOKALA ACC RD, Hawaii, HI

Built 1957 Load: 33.0 t ADT: 6,700

HAWAII BELT RD

Fair

Over: WAIKOLU STRM

2.74MI W/KAUNIHO RD, Hawaii, HI

Built 1934 Load: 33.4 t ADT: 6,700

KAWAIHAE-MAHUKONA

Fair

Over: MAKAHUNA STRM

0.25MI N/SPENCER PK RD, Hawaii, HI

Built 1960 Load: 33.4 t ADT: 7,500

PIIHONUA RD

Fair

Over: PIIHONUA-WAILUKU RIVER

TMK 2-5-009:004, Hawaii, HI

Built 1973 Load: 33.4 t ADT: 370

AKAKA FALLS RD

Fair

Over: PAHEEHEE GLH-AKAKA FALLS

3.37MI W/MAMALAHOA HWY, Hawaii, HI

Built 1927 Load: 33.7 t ADT: 720

LANIKAULA ST

Fair

Over: WAIAKEA STREAM

TMK 2-4-01:19, Hawaii, HI

Built 1968 Load: 33.7 t ADT: 3,020

HAWAII BELT RD

Fair

Over: KILAU STRM

3.54MI W/OOKALA ACC RD, Hawaii, HI

Built 1953 Load: 34.0 t ADT: 6,700

MAHUKONA BCH RD

Fair

Over: MAHUKONA BEACH RD/RELIEF

TMK 5-7-03:2, Hawaii, HI

Built 1978 Load: 34.0 t ADT: 50

KUPULAU RD

Fair

Over: WAIAKEA STRM

TMK 2-4-065:063, Hawaii, HI

Built 1967 Load: 34.3 t ADT: 3,000

PIIHONUA RD

Fair

Over: WAILUKU RIVER

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

Built 1976 Load: 35.0 t ADT: 370

AKONI PULE HWY

Fair

Over: NIULII STRM

0.03 MI W/KEOKEA PK RD, Hawaii, HI

Built 1918 Load: 35.6 t ADT: 1,300

AKONI PULE HWY

Fair

Over: WAIKANE STRM

0.06 MI W/ KEOKEA PK RD, Hawaii, HI

Built 1918 Load: 38.2 t ADT: 1,300

PLT RD

Fair

Over: HI BLT RD-HAKALAU PLT RD

1.14MI E/KAUNIHO RD, Hawaii, HI

Built 1953 Load: 38.6 t ADT: 1

ROADWAY

Fair

Over: INTERMITTENT STRM

KEOPU 3RD N KONA HI, Hawaii, HI

Built 1971 Load: 40.8 t ADT: 1,368

HAWAII BELT RD

Fair

Over: WAIKAUMALO STRM

2.20MI W/KAUNIHO RD, Hawaii, HI

Built 1952 Load: 41.1 t ADT: 6,700

HAWAII BELT RD

Fair

Over: KAIWILAHILAHI STRM

5.22MI E/OOKALA ACC RD, Hawaii, HI

Built 1956 Load: 41.5 t ADT: 6,700

LAUKULA ST

Fair

Over: AUWAIAKEAKUA GLH

TMK 6-8-03:2, Hawaii, HI

Built 1970 Load: 42.8 t ADT: 100

HAWAII BELT RD

Fair

Over: KAIEIE STRM

0.27MI W/KAIEIE RD, Hawaii, HI

Built 1967 Load: 44.4 t ADT: 10,400

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.