County profile · official public datasets

Lewis County, WA

419 public highway bridges tracked in the FHWA National Bridge Inventory: 39.4% rated Good, 56.8% Fair, 3.8% Poor.

419
Public bridges
39.4%
Good condition
3.8%
Poor condition

The verdict

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

Lewis County pairs a better-than-median Poor-condition share among rated counties in the state with an older average build year than the state inventory.

Top 26%
lowest Poor share in state
3.8%
Poor-condition share
419
public highway bridges
1969
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.

Lewis County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Lewis County ranks #10 of 39 Washington counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 3.8%). Lewis County, Washington contains 419 public highway bridges. Roughly 39.4% are rated “Good,” 56.8% “Fair,” and 3.8% “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

419

Public highway bridges in Lewis County

Good condition

39.4%

165 of 419 rated 7-9

Fair condition

56.8%

238 of 419 rated 5-6

Poor condition

3.8%

16 of 419 rated 4 or below

In-state Poor-share rank

#10 of 39

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

Condition distribution

Share of 419 NBI-tracked bridges by lowest applicable component rating.

Good
39.4% (165)
Fair
56.8% (238)
Poor
3.8% (16)

Lewis County's Poor-condition bridges carry 102,118 vehicle crossings a day

That is 7.3% of the county's reported daily bridge traffic on 3.8% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 6,382 crossings a day against 2,418 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 418 of 419 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

64.7% of Lewis County's bridges have passed the 50-year mark

271 of the 419 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 39.4% 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 40.8% of the county's Poor-condition bridge traffic

I-5 over LACAMAS CR DREWS PR RD, built 1953, carries 41,665 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 16-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 102,118 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Lewis County's bridges were built

419 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1950s, when 108 of the county's bridges still in the inventory were built, which is 25.8% of those with a recorded year. That cohort is now 65 to 74 years old in the 2024 inventory. Its average build year is 1969, 6 years older than the Washington average of 1975.

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

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

The 5 Washington counties nearest Lewis County in number of bridges, with their condition splits. Its 3.8% Poor share is the 2nd-lowest of these 6. Its average build year of 1969 against a peer-group mean of 1975 is 6 years older.

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

Bridge inventory size and condition shares for Lewis County and the 5 Washington counties closest to it in inventory size
County Bridges Poor
Snohomish County 500 4%
Pierce County 472 4.2%
Lewis County (this page) 419 3.8%
Grays Harbor County 363 9.4%
Whatcom County 354 5.4%
Whitman County 347 3.5%

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

Similar inventory size

Nearest county inventories outside WA (419 bridges here).

Similar average build year

Nearest mean year-built outside WA (1969 here).

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

All 419 Good 165 Fair 238 Poor 16

All bridges (419)

CENTRALIA ALPHA RD

Good

Over: MID FK NEWAUKUM RIVER

2.5 MILES NW JCT SR 508, Lewis, WA

Built 2022 Load: 40.8 t ADT: 498

I-5 SBCD

Good

Over: SKOOKUMCHUCK RIVER

0.7 N JCT SR 507, Lewis, WA

Built 2013 Load: 41.1 t ADT: 12,752

SR 508

Good

Over: TILTON RIVER

25.0 E JCT I-5, Lewis, WA

Built 1988 Load: 42.6 t ADT: 1,171

BURRI RD.

Good

Over: LAKE CR.

3.0 SE CURTIS, Lewis, WA

Built 1988 Load: 42.6 t ADT: 47

NO DATA ENTERED

Good

Over: CLEAR FORK COWLITZ

0.7 MILE WEST OF HWY 12 (, Lewis, WA

Built 1993 Load: 42.7 t ADT: 65

SR 6

Good

Over: UNNAMED CREEK

21.8 E PACIFIC CO, Lewis, WA

Built 2021 Load: 42.8 t ADT: 7,052

PIGEON SPRINGS RD

Good

Over: FRASE CREEK

1.2 N JCT SR 508, Lewis, WA

Built 2019 Load: 43.1 t ADT: 69

PARK RD

Good

Over: I-5

3.0 N JCT SR 505, Lewis, WA

Built 1977 Load: 43.5 t ADT: 100

SR 508

Good

Over: I-5

JCT I-5, Lewis, WA

Built 1986 Load: 43.5 t ADT: 4,189

SILVERBROOK ROAD

Good

Over: Silver Creek

1.0 East Randle, Lewis, WA

Built 2006 Load: 43.5 t ADT: 462

GODFREY

Good

Over: KLICKITAT CREEK

South of Mossyrock Rd E., Lewis, WA

Built 2014 Load: 43.5 t ADT: 77

ROGERS RD

Good

Over: I-5

0.2 N COWLITZ CO, Lewis, WA

Built 1976 Load: 44.4 t ADT: 2,666

NB I-5 RAMP

Good

Over: DILLENBAUGH CREEK

3.8 N JCT SR 508, Lewis, WA

Built 2009 Load: 44.4 t ADT: 2,590

ANDERSON ROAD

Good

Over: CURTIS CREEK

3.8 SW WINLOCK, Lewis, WA

Built 2009 Load: 44.4 t ADT: 36

NO DATA ENTERED

Good

Over: OTTER CREEK

3.6 MILES NW OF HWY. 508, Lewis, WA

Built 1977 Load: 45.4 t ADT: 20

DEEP CREEK ROAD

Good

Over: DEEP CREEK

7.0 W Chehalis, Lewis, WA

Built 2007 Load: 45.4 t ADT: 10

SR 506

Good

Over: LACAMAS CREEK

7.0 E COWLITZ CO, Lewis, WA

Built 2020 Load: 46.3 t ADT: 2,052

NO DATA ENTERED

Good

Over: NO DATA ENTERED

NO DATA ENTERED, Lewis, WA

Built 1999 Load: 47.0 t ADT: 20

SR 508

Good

Over: TILTON RIVER

28.5 E JCT I-5, Lewis, WA

Built 1994 Load: 47.2 t ADT: 1,171

BIG HANAFORD RD.

Good

Over: HANAFORD CREEK

7.5 E. CENTRALIA, Lewis, WA

Built 2003 Load: 47.2 t ADT: 36

CHAMBER WAY

Good

Over: I-5

1.1 N JCT SR 6, Lewis, WA

Built 2018 Load: 47.6 t ADT: 12,588

I-5 N-W RAMP

Good

Over: DILLENBAUGH CR

6.8 N JCT SR 508, Lewis, WA

Built 1976 Load: 48.1 t ADT: 3,301

SR 6

Good

Over: S FORK CHEHALIS R

18.0 E PACIFIC CO, Lewis, WA

Built 2009 Load: 48.1 t ADT: 3,973

LOGAN HILL ROAD

Good

Over: BERWICK CREEK

1.10 JCT 94000, Lewis, WA

Built 2007 Load: 48.1 t ADT: 1,001

SR 507 NB

Good

Over: I-5 RAMP

JCT I-5, Lewis, WA

Built 2014 Load: 48.3 t ADT: 7,639

WASHINGTON ROUTE 1

Good

Over: LAUGHINGWATER CREEK

2.6 MILES NORTH OF PARK B, Lewis, WA

Built 1994 Load: 49.0 t ADT: 1,375

FIR STREET

Good

Over: OLEQUA CREEK

0.02 W SR 603, Lewis, WA

Built 2018 Load: 50.2 t ADT: 1,199

NO DATA ENTERED

Good

Over: BENHAM CREEK

16 MILES SOUTH OF HWY 12, Lewis, WA

Built 2012 Load: 50.5 t ADT: 650

SR 505

Good

Over: CEDAR CREEK

10.6 E JCT I-5, Lewis, WA

Built 1962 Load: 50.8 t ADT: 647

NO DATA ENTERED

Good

Over: BIG CREEK

NO DATA ENTERED, Lewis, WA

Built 2007 Load: 50.8 t ADT: 99

TELEGRAPH ROAD

Good

Over: COON CREEK

3.0 SW TOLEDO, Lewis, WA

Built 1954 Load: 50.8 t ADT: 102

BRIDGEOVER RD

Good

Over: US 12

5.0 E JCT SR 7, Lewis, WA

Built 1966 Load: 52.6 t ADT: 647

SR 506

Good

Over: OLEQUA CREEK

4.9 E COWLITZ CO, Lewis, WA

Built 1981 Load: 53.5 t ADT: 1,590

US 12

Good

Over: GULCH

3.6 E JCT SR 123, Lewis, WA

Built 1997 Load: 55.3 t ADT: 1,729

LABREE ROAD

Good

Over: I-5

3.7 N JCT SR 508, Lewis, WA

Built 2008 Load: 55.3 t ADT: 1,605

4700 ROAD

Good

Over: W. FORK WILLAME CREEK

NEAR SKATE CREEK, Lewis, WA

Built 2000 Load: 56.3 t ADT: 40

NO DATA ENTERED

Good

Over: WEST FORK TILTON

NO DATA ENTERED, Lewis, WA

Built 2005 Load: 59.0 t ADT: 50

NO DATA ENTERED

Good

Over: WOODS CREEK

NO DATA ENTERED, Lewis, WA

Built 2008 Load: 61.2 t ADT: 390

SR 6

Good

Over: UNNAMED CREEK

21.7 E PACIFIC CO, Lewis, WA

Built 2021 Load: 61.9 t ADT: 5,690

BUNKER CREEK ROAD

Good

Over: PRAIRIE CREEK

CHEHALIS, Lewis, WA

Built 2018 Load: 62.5 t ADT: 422

HOPE CREEK RD

Good

Over: HOPE CR.

0.95 S JCT SR 6, Lewis, WA

Built 2000 Load: 62.6 t ADT: 1

GRAF ROAD

Good

Over: SCAMMON CREEK

0.4 W CENTRLIA, Lewis, WA

Built 2020 Load: 62.9 t ADT: 480

LINCOLN CREEK ROAD

Good

Over: NORTH FORK LINCOLN CREEK

11.0 W CENTRLIA, Lewis, WA

Built 2016 Load: 65.4 t ADT: 218

CRUMB ROAD

Good

Over: HIGHLAND CREEK

0.17 NW JCT HWY 12, Lewis, WA

Built 2022 Load: 67.1 t ADT: 15

NO DATA ENTERED

Good

Over: NORTH FORK CISPUS RIVER

SE OF RANDLE FOLLOWING R, Lewis, WA

Built 1991 Load: 72.1 t ADT: 40

NO DATA ENTERED

Good

Over: ORR CREEK

NO DATA ENTERED, Lewis, WA

Built 1985 Load: 73.5 t ADT: 50

THIRD STREET

Good

Over: STOWE CREEK

2.5 BLKS S SR 6, Lewis, WA

Built 1994 Load: 74.2 t ADT: 600

SR 6

Good

Over: FRONIA CREEK

6.5 E PACIFIC CO, Lewis, WA

Built 2019 Load: 79.4 t ADT: 2,463

SB I-5 RAMP

Good

Over: DILLENBAUGH CREEK

3.8 N JCT SR 508, Lewis, WA

Built 2009 Load: 84.4 t ADT: 2,702

ANNONEN RD

Good

Over: OLEQUA CK

1.0 n vader, Lewis, WA

Built 2002 Load: 86.2 t ADT: 47

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.