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

Good-condition bridges (106)

KAHANA DR

Good

Over: KEAAKAUKAU GULCH

TMK: 4-6-009:054, Hawaii, HI

Built 1930 Load: 7.5 t ADT: 700

NORTH PECK RD

Good

Over: RELIEF N PECK RD

310 NW/HWY 11, Hawaii, HI

Built 1940 Load: 8.1 t ADT: 340

MANOWAIOPAE HMSTD

Good

Over: KILAU STRM

50 SW/Spencer Rd, Hawaii, HI

Built 1930 Load: 10.4 t ADT: 200

HAWAII BELT RD

Good

Over: KANENELU STRM

1.26MI S/MAILE ST, Hawaii, HI

Built 1938 Load: 15.9 t ADT: 2,800

KAWAIHAE-MAHUKONA

Good

Over: MAKEAHUA STRM

0.19MI N/SPENCER PK RD, Hawaii, HI

Built 1934 Load: 16.8 t ADT: 7,500

OLD MAMALAHOA HWY

Good

Over: HONOMU STREAM

0.4MI S/AKAKA FALLS RD, Hawaii, HI

Built 1935 Load: 17.8 t ADT: 500

HAWAII BELT RD

Good

Over: MOAULA STRM

0.53MI S/S SPUR PAHALA AC, Hawaii, HI

Built 1938 Load: 20.7 t ADT: 2,800

KAWAILANI ST

Good

Over: WAIAKEA STR

TMK 2-4-003:022, Hawaii, HI

Built 1967 Load: 21.1 t ADT: 3,990

HAWAII BELT RD

Good

Over: AHOLE STRM

3.95MI W/KAUNIHO RD, Hawaii, HI

Built 1934 Load: 21.4 t ADT: 6,700

KINOOLE STREET

Good

Over: WAIAKEA STREAM

TMK:2-2-021:041, Hawaii, HI

Built 1964 Load: 21.7 t ADT: 18,050

OLD MAMALAHOA HWY

Good

Over: INOINO GULCH

0.2MI W/PUNONO RD, Hawaii, HI

Built 2001 Load: 22.4 t ADT: 1,778

HONOKAA-WAIPIO RD

Good

Over: WAIPUNAHOE STRM

1.2 MI E/MUD LN, Hawaii, HI

Built 1972 Load: 22.7 t ADT: 1,400

HAWAII BELT RD

Good

Over: KAWAINUI STRM

0.95MI E/PEPEEKEO ACC RD, Hawaii, HI

Built 1948 Load: 23.0 t ADT: 10,000

WAIAKALOA

Good

Over: WAIAKALOA GULCH

TMK 9-6-08:2, Hawaii, HI

Built 1935 Load: 23.0 t ADT: 200

HAWAII BELT RD

Good

Over: RAILROAD(HONUAPO)

0.06MI S/HONUAPO WHARF RD, Hawaii, HI

Built 1940 Load: 23.3 t ADT: 3,730

KAIULANI ST

Good

Over: WAILUKU RIVER

400 NNW/Waianuenue, Hawaii, HI

Built 1940 Load: 23.3 t ADT: 375

HAWAII BELT RD

Good

Over: POHAKUPUKA STRM

4.25MI W/KAUNIHO RD, Hawaii, HI

Built 1953 Load: 24.0 t ADT: 6,700

KAAPAHU RD

Good

Over: ALIIPALI GULCH

TMK 4-3-015:009, Hawaii, HI

Built 1939 Load: 24.3 t ADT: 50

SOUTH KULANI RD

Good

Over: RELIEF S KULANI RD

0.83mi SE/Hwy 11, Hawaii, HI

Built 1969 Load: 24.9 t ADT: 880

HAWAII BELT RD

Good

Over: HIONOMOA STRM

0.44MI S/S SPUR PAHALA AC, Hawaii, HI

Built 1938 Load: 25.3 t ADT: 2,800

HONOKAA-WAIPIO RD

Good

Over: HONOKAIA STRM

3.1 MI E/MUD LN, Hawaii, HI

Built 1966 Load: 25.4 t ADT: 1,400

OLD MAMALAHOA HWY

Good

Over: AHUALOA GULCH

0.2 MI W/KUMUPELE RD, Hawaii, HI

Built 1982 Load: 26.2 t ADT: 200

HAWAII BELT RD

Good

Over: PUNALUU STRM

1.29MI N/PUNALUU BLK SD R, Hawaii, HI

Built 1940 Load: 26.6 t ADT: 2,800

HAWAII BELT RD

Good

Over: KALOPA STRM

2.41MI E/MAMANE ST, Hawaii, HI

Built 1959 Load: 28.2 t ADT: 7,200

KOHALA MTN RD

Good

Over: KEAWEWAI STRM(HONOKOA)

5.89MI N/KAWAIHAE RD, Hawaii, HI

Built 1961 Load: 28.2 t ADT: 2,400

HAWAII BELT RD

Good

Over: PUKIHAE STRM

0.05MI W/PUKIHAE ST, Hawaii, HI

Built 1949 Load: 28.8 t ADT: 16,600

HONOKAA-WAIPIO RD

Good

Over: WAIKALOA STRM

1.1 MI E/MUD LN, Hawaii, HI

Built 1971 Load: 29.0 t ADT: 1,400

KAWAIHAE-MAHUKONA

Good

Over: UNMD STRM-TWN MTL CULVT

2.09MI N/MALUOKALANI ST, Hawaii, HI

Built 1966 Load: 29.0 t ADT: 3,100

KAWAIHAE-MAHUKONA

Good

Over: UNMD STRM-TPL MTL CULVT

5.60MI N/MALUOKALANI ST, Hawaii, HI

Built 1966 Load: 29.0 t ADT: 3,100

HAWAII BELT RD

Good

Over: MOANALULU STRM

5.552I E/OOKALA ACC RD, Hawaii, HI

Built 1956 Load: 29.5 t ADT: 6,700

HAWAII BELT RD

Good

Over: KIHALANI STRM

4.86MI E/OOKALA ACC RD, Hawaii, HI

Built 1956 Load: 29.8 t ADT: 6,700

Heahea Street

Good

Over: Palai Stream

TMK: 2-4-016:034, Hawaii, HI

Built 1993 Load: 29.8 t ADT: 5,999

POHAKEA RD

Good

Over: MANIENIE GLH

TMK 4-3-07:7, Hawaii, HI

Built 1981 Load: 29.8 t ADT: 125

MAMALAHOA

Good

Over: NAALEHU RDD CNT

TMK 9-5-21:21, Hawaii, HI

Built 1966 Load: 29.8 t ADT: 3,730

MAMALAHOA HWY

Good

Over: KAMAKOA STRM #2

1.35MI S/SADDLE RD JUNCT, Hawaii, HI

Built 1930 Load: 30.8 t ADT: 5,900

HONOKAA-WAIPIO RD

Good

Over: AHUALOA STRM

0.72MI W/KAHILI ST, Hawaii, HI

Built 1966 Load: 30.8 t ADT: 1,400

KAWAIHAE-MAHUKONA

Good

Over: UNMD STRM-MTL CULVT

11 02MI N/MALUOKALANI ST, Hawaii, HI

Built 1972 Load: 30.8 t ADT: 3,100

OSHIRO RD

Good

Over: RELIEF OSHIRO RD

1-8-075:001, Hawaii, HI

Built 1940 Load: 31.1 t ADT: 260

HAWAII BELT RD

Good

Over: UMAUMA STRM

0.34MI E/KAUNIHO RD, Hawaii, HI

Built 1952 Load: 31.4 t ADT: 6,700

HAWAII BELT RD

Good

Over: KAHAWAILIILII STRM

0.83MI E/MAMANE ST, Hawaii, HI

Built 1959 Load: 31.8 t ADT: 7,200

HAWAII BELT RD

Good

Over: PAAUAU STRM

0.01MI N/N SPUR PAHALA AC, Hawaii, HI

Built 2002 Load: 32.4 t ADT: 2,800

HAWAII BELT RD

Good

Over: KAALAALA STRM

1.52MI N/KAMANI ST, Hawaii, HI

Built 2001 Load: 32.4 t ADT: 2,800

HAWAII BELT ROAD

Good

Over: PANAEWA STREAM

3.83 MI NE PAHALA JUNC, Hawaii, HI

Built 1945 Load: 32.4 t ADT: 2,800

HAWAII BELT RD

Good

Over: KAWAILI STRM

1.56MI E/PLT RD, Hawaii, HI

Built 1938 Load: 32.4 t ADT: 7,200

HAWAII BELT RD

Good

Over: KAPEHU STRM

6.42MI E/OOKALA ACC RD, Hawaii, HI

Built 1951 Load: 32.4 t ADT: 6,700

Keaau-Pahoa Bypass

Good

Over: Unknown Stream

.36 S. of Keaau-Pahoa Rd, Hawaii, HI

Built 2004 Load: 32.4 t ADT: 23,400

Keaau-Pahoa Road

Good

Over: Unknown Stream

.9 mi S of Keaau-Pahoa, Hawaii, HI

Built 2004 Load: 32.4 t ADT: 23,400

Keeau-Pahoa Road

Good

Over: Unknown Stream

1.1 S. of Keaau Pahoa Rd, Hawaii, HI

Built 2004 Load: 32.4 t ADT: 23,400

BYPASS (RT.130)

Good

Over: UNNAMED STREAM

I MI S KEAAU CAMP, Hawaii, HI

Built 1999 Load: 32.4 t ADT: 23,400

HONOKAA-WAIPIO RD

Good

Over: KAPULENA GULCH

0.4 MI W/VELEZ RD, Hawaii, HI

Built 1970 Load: 32.4 t ADT: 1,400

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.