County profile · official public datasets

Grays Harbor County, WA

363 public highway bridges tracked in the FHWA National Bridge Inventory: 48.8% rated Good, 41.9% Fair, 9.4% Poor.

363
Public bridges
48.8%
Good condition
9.4%
Poor condition

The verdict

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

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

32nd
of 39 on Poor share
9.4%
Poor-condition share
363
public highway bridges
1978
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.

Grays Harbor County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Grays Harbor County ranks #32 of 39 Washington counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 9.4%). Grays Harbor County, Washington contains 363 public highway bridges. Roughly 48.8% are rated “Good,” 41.9% “Fair,” and 9.4% “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

363

Public highway bridges in Grays Harbor County

Good condition

48.8%

177 of 363 rated 7-9

Fair condition

41.9%

152 of 363 rated 5-6

Poor condition

9.4%

34 of 363 rated 4 or below

In-state Poor-share rank

#32 of 39

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

Condition distribution

Share of 363 NBI-tracked bridges by lowest applicable component rating.

Good
48.8% (177)
Fair
41.9% (152)
Poor
9.4% (34)

Grays Harbor County's Poor-condition bridges carry 153,497 vehicle crossings a day

That is 18.9% of the county's reported daily bridge traffic on 9.4% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 4,515 crossings a day against 1,699 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 363 of 363 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

48.8% of Grays Harbor County's bridges have passed the 50-year mark

177 of the 363 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 48.8% 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 16.7% of the county's Poor-condition bridge traffic

US 101 over CHEHALIS RIVER, built 1955, carries 25,602 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 34-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 153,497 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Grays Harbor County's bridges were built

363 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1970s, when 65 of the county's bridges still in the inventory were built, which is 17.9% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year (1978) matches the Washington average (1975).

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

How Grays Harbor County compares with Washington's closest counties by inventory size

The 5 Washington counties nearest Grays Harbor County in number of bridges, with their condition splits. Its 9.4% Poor share is the 5th-lowest of these 6. Its average build year of 1978 against a peer-group mean of 1973 is 5 years newer.

Showing the 5 closest of 38 Washington counties eligible for comparison.

Bridge inventory size and condition shares for Grays Harbor County and the 5 Washington counties closest to it in inventory size
County Bridges Poor
Lewis County 419 3.8%
Grays Harbor County (this page) 363 9.4%
Whatcom County 354 5.4%
Whitman County 347 3.5%
Kittitas County 308 10.4%
Spokane County 307 6.8%

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

Similar inventory size

Nearest county inventories outside WA (363 bridges here).

Similar average build year

Nearest mean year-built outside WA (1978 here).

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

All 363 Good 177 Fair 152 Poor 34

Good-condition bridges (177)

TAYLORS FERRY ROAD

Good

Over: TAYLOR CREEK

0.03 N JCT 96412, Grays Harbor, WA

Built 2017 Load: 58.6 t ADT: 70

BROOKLYN ROAD

Good

Over: GARRARD CREEK

0.03 N WILDERNESS ROAD, Grays Harbor, WA

Built 2011 Load: 59.0 t ADT: 167

MOX CHEHALIS RD

Good

Over: SR 8

1.3 E JCT SR 108, Grays Harbor, WA

Built 2003 Load: 59.9 t ADT: 2,445

IRR BIA RTE 26

Good

Over: COOK CREEK

25.7 KM NE COPALIS X-ING, Grays Harbor, WA

Built 2002 Load: 60.3 t ADT: 605

GLEASON ROAD

Good

Over: SATSOP OVERFLOW CHANNEL

0.12 E JCT 9725, Grays Harbor, WA

Built 2001 Load: 61.7 t ADT: 35

MOX CHEHALIS ROAD

Good

Over: MOX CHEHALIS CREEK

7.9 NE JCT SR12, Grays Harbor, WA

Built 2018 Load: 62.5 t ADT: 826

BLACK CREEK ROAD

Good

Over: BLACK CREEK

03.9 NE JCT 9519, Grays Harbor, WA

Built 2011 Load: 62.6 t ADT: 127

POLSON CAMP ROAD

Good

Over: BIG CREEK

0.3 NE JCT SR 101, Grays Harbor, WA

Built 2017 Load: 64.5 t ADT: 35

NO DATA ENTERED

Good

Over: EAST FORK BIG CREEK

NO DATA ENTERED, Grays Harbor, WA

Built 1972 Load: 66.3 t ADT: 50

KELLEY ROAD

Good

Over: MIDDLE FORK SATSOP RIVER

00.2 NW JCT 7365, Grays Harbor, WA

Built 1997 Load: 67.1 t ADT: 150

WEST WYNOOCHE ROAD

Good

Over: GEISSLER CREEK

2.5 N. JCT US12, Grays Harbor, WA

Built 2020 Load: 67.1 t ADT: 447

SARGENT BOULEVARD

Good

Over: WILSON CREEK

ENT MORRISON RIV PK, Grays Harbor, WA

Built 1992 Load: 74.4 t ADT: 250

SOUTH BANK ROAD

Good

Over: TAYLOR CREEK

4.2 E JCT 96540, Grays Harbor, WA

Built 2017 Load: 74.8 t ADT: 1,342

FOREMAN ROAD

Good

Over: SAND CREEK

0.9 W JCT MOX CHEHALIS RD, Grays Harbor, WA

Built 2018 Load: 80.4 t ADT: 104

US 12

Good

Over: UNNAMED TRIBUTARY

9.1 E JCT US 101, Grays Harbor, WA

Built 2018 Load: 89.8 t ADT: 20,963

GEISSLER ROAD

Good

Over: MOONEY CREEK

1.9 SW JCT 95190, Grays Harbor, WA

Built 2002 Load: 89.8 t ADT: 289

OCEAN BEACH ROAD

Good

Over: CHENOIS CREEK

4.6 NW JCT US 101, Grays Harbor, WA

Built 2014 Load: 89.8 t ADT: 2,633

MINKLER ROAD

Good

Over: STEVENS CREEK

2.2 MILES E JCT SR 107, Grays Harbor, WA

Built 2015 Load: 89.8 t ADT: 45

TULIPS ROAD

Good

Over: HUMPTULIPS OVERFLOW

0.0 W JCT 9423, Grays Harbor, WA

Built 2012 Load: 94.6 t ADT: 50

WENZEL SLOUGH ROAD

Good

Over: VANCE CREEK

0.34 MI. W. OF 9641, Grays Harbor, WA

Built 1964 Load: 96.9 t ADT: 649

WYNOOCHE VALLEY RD

Good

Over: NEIL CREEK

26.0 MILES N. SR12, Grays Harbor, WA

Built 2008 Load: 96.9 t ADT: 215

SOUTH BANK ROAD

Good

Over: DAVIS CREEK

0.4 N GARRARD CREEK RD, Grays Harbor, WA

Built 2011 Load: 96.9 t ADT: 807

BOYER ROAD

Good

Over: UNNAMED CREEK

0.01 MI S JCT 84500, Grays Harbor, WA

Built 2016 Load: 96.9 t ADT: 40

POLSON CAMP ROAD

Good

Over: BIG CREEK

0.7 MI NE JCT US101, Grays Harbor, WA

Built 2016 Load: 96.9 t ADT: 35

JOHNS RIVER ROAD

Good

Over: ATWOOD CREEK

4.3 MI E JCT SR105, Grays Harbor, WA

Built 2016 Load: 96.9 t ADT: 183

BUSH CREEK ROAD

Good

Over: BUSH CREEK

0.89 NE JCT 78150, Grays Harbor, WA

Built 2019 Load: 96.9 t ADT: 396

NO DATA ENTERED

Good

Over: NEWBURY CREEK

NO DATA ENTERED, Grays Harbor, WA

Built 2005 Load: 97.2 t ADT: 50

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.