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

Good-condition bridges (165)

NO DATA ENTERED

Good

Over: LITTLE NISQUALLY RIVER

12.4 MILES WEST OF HWY 7, Lewis, WA

Built 1971 Load: 31.8 t ADT: 30

SR 6

Good

Over: ROCK CREEK

1.5 E PACIFIC CO, Lewis, WA

Built 2015 Load: 32.1 t ADT: 1,561

NO DATA ENTERED

Good

Over: WOODS CREEK #2

NO DATA ENTERED, Lewis, WA

Built 2019 Load: 32.4 t ADT: 99

2350RD

Good

Over: WOODS CREEK #3

NO DATA ENTERED, Lewis, WA

Built 2019 Load: 32.4 t ADT: 99

NO DATA ENTERED

Good

Over: CAMP CREEK

SE on 23RD from CVRD, Lewis, WA

Built 2022 Load: 32.4 t ADT: 375

COUSINS ROAD

Good

Over: UNNAMED TRIBUTARY

3.8 S SR6, Lewis, WA

Built 2021 Load: 32.4 t ADT: 168

US 12

Good

Over: COWLITZ R OVERFLOW

8.1 E JCT SR 131, Lewis, WA

Built 1958 Load: 32.7 t ADT: 2,648

US 12

Good

Over: COWLITZ RIVER

1.8 E JCT SR 122, Lewis, WA

Built 1961 Load: 32.7 t ADT: 6,630

SR 507

Good

Over: SKOOKUMCHUCK RIVER

4.5 N JCT I-5, Lewis, WA

Built 1978 Load: 32.7 t ADT: 3,828

I-5 NBCD

Good

Over: SKOOKUMCHUCK RIVER

0.7 N JCT SR 507, Lewis, WA

Built 2013 Load: 32.7 t ADT: 13,670

I-5

Good

Over: DILLENBAUGH CREEK

3.8 N JCT SR 508, Lewis, WA

Built 1965 Load: 32.7 t ADT: 59,955

NO DATA ENTERED

Good

Over: SUMMIT CREEK

0.4 MILE NORTH OF HWY 12, Lewis, WA

Built 1965 Load: 32.7 t ADT: 20

RIFFE ROAD

Good

Over: PUD TAILRACE

0.5 SW PACKWOOD, Lewis, WA

Built 1962 Load: 32.7 t ADT: 6

HAYWIRE ROAD

Good

Over: STEARNS CREEK

2.5 W NAPAVINE, Lewis, WA

Built 1963 Load: 32.7 t ADT: 168

HARRISON AVE

Good

Over: SKOOKUMCHUCK RIVER

00.0 JCT. W FIRST S, Lewis, WA

Built 1968 Load: 32.7 t ADT: 22,996

Alley

Good

Over: China Creek

0.1 WEST OF ROCK ST, Lewis, WA

Built 2011 Load: 32.7 t ADT: 28

SR 505

Good

Over: LACAMAS CREEK

0.5 E JCT I-5, Lewis, WA

Built 1955 Load: 33.4 t ADT: 3,773

SNYDER ROAD

Good

Over: HALL CREEK

0.2 E HWY 12, Lewis, WA

Built 2020 Load: 33.4 t ADT: 212

SR 508

Good

Over: BEAR CANYON CREEK

21.4 E JCT I-5, Lewis, WA

Built 1983 Load: 33.6 t ADT: 1,171

SR 505

Good

Over: COWLITZ RIVER

3.8 E JCT I-5, Lewis, WA

Built 1994 Load: 33.6 t ADT: 3,842

ALLEY

Good

Over: China Creek

SW alley Maple/Pearl, Lewis, WA

Built 1946 Load: 33.6 t ADT: 10

SR 506

Good

Over: I-5

JCT I-5, Lewis, WA

Built 1958 Load: 33.7 t ADT: 1,392

US 12

Good

Over: LAKE CR

0.3 E JCT SR 7, Lewis, WA

Built 1952 Load: 34.5 t ADT: 4,992

SR 508

Good

Over: S FORK NEWAUKUM RIVER

2.6 E JCT I-5, Lewis, WA

Built 1989 Load: 34.5 t ADT: 4,269

LOST VALLEY ROAD

Good

Over: STILLMAN CREEK

0.3 W BOISTFORT, Lewis, WA

Built 1995 Load: 34.5 t ADT: 157

NORTH MILITARY RD.

Good

Over: OLEQUA CREEK

4.55 N JCT SR 505, Lewis, WA

Built 1995 Load: 34.5 t ADT: 2,252

SARGENT ROAD

Good

Over: OLEQUA CREEK

2.0 SE EVELINE, Lewis, WA

Built 1972 Load: 34.5 t ADT: 621

BUNKER ROAD

Good

Over: BUNKER CREEK

10.0 NW ADNA, Lewis, WA

Built 1955 Load: 34.5 t ADT: 24

TELEGRAPH ROAD

Good

Over: BEAR CREEK

3.0 SW TOLEDO, Lewis, WA

Built 1965 Load: 34.5 t ADT: 122

4600000

Good

Over: LAVA CREEK

7.39 MILES DOWN #46RD, Lewis, WA

Built 2020 Load: 35.3 t ADT: 50

SR 506

Good

Over: STILLWATER CR

3.7 E COWLITZ CO, Lewis, WA

Built 1963 Load: 35.4 t ADT: 972

SR 505

Good

Over: MILL CREEK

1.3 E JCT I-5, Lewis, WA

Built 1984 Load: 35.4 t ADT: 3,690

ANTRIM ROAD

Good

Over: OLEQUA CREEK

0.5 SE EVELINE, Lewis, WA

Built 1958 Load: 35.4 t ADT: 261

HYPPA ROAD

Good

Over: INDEPENDENCE CREEK

0.01 E.JCT.10024, Lewis, WA

Built 1968 Load: 35.4 t ADT: 23

JYLHA ROAD

Good

Over: INDEPENDENCE CREEK

13.0 W CENTRALIA, Lewis, WA

Built 1971 Load: 35.4 t ADT: 56

GARRARD CREEK RD

Good

Over: INDEPENDENCE CREEK

0.07 W.JCT.91008, Lewis, WA

Built 1968 Load: 35.4 t ADT: 219

MAYS BRIDGE ROAD

Good

Over: CHEHALIS RIVER

NORTH OF SR 6 MP 37.20, Lewis, WA

Built 2015 Load: 35.6 t ADT: 302

US 12

Good

Over: RAINEY CREEK OVERFLOW

10.1 E JCT SR 7, Lewis, WA

Built 1957 Load: 36.3 t ADT: 4,752

NO DATA ENTERED

Good

Over: NORTH FORK TILTON RIVER

3.8 MILES NW OF JCT. HWY, Lewis, WA

Built 1983 Load: 36.3 t ADT: 70

LITTLE HANAFORD

Good

Over: S FK HANAFORD CREEK

2.0 W KOPIAH, Lewis, WA

Built 1957 Load: 36.3 t ADT: 137

WILDWOOD ROAD

Good

Over: BLACK CREEK

2.99 NW SR 506, Lewis, WA

Built 2013 Load: 36.3 t ADT: 170

W. Maple St

Good

Over: China Creek

W. of Hwy 507 (Tower Ave), Lewis, WA

Built 1941 Load: 36.3 t ADT: 1,504

SR 7

Good

Over: NISQUALLY R OVERFLOW

16.1 N JCT SR 508, Lewis, WA

Built 1945 Load: 37.2 t ADT: 2,818

GARRARD CREEK RD.

Good

Over: S.FORK GARRARD CREEK

5.10 NW.JCT.91008, Lewis, WA

Built 1972 Load: 37.2 t ADT: 175

COOK ROAD

Good

Over: LAKE CREEK

2.0 SE CURTIS, Lewis, WA

Built 1994 Load: 37.2 t ADT: 25

SR 508

Good

Over: S FORK NEWAUKUM RIVER

13.7 E JCT I-5, Lewis, WA

Built 2018 Load: 37.3 t ADT: 1,672

COMA ROAD

Good

Over: BRIM CREEK

2.0 W VADER, Lewis, WA

Built 1960 Load: 38.1 t ADT: 66

CHANDLER ROAD

Good

Over: CHEHALIS RIVER

1.O E DOTY, Lewis, WA

Built 2010 Load: 38.1 t ADT: 500

I-5

Good

Over: RR & REYNOLDS RD.

1.6 N JCT SR 507, Lewis, WA

Built 2013 Load: 38.2 t ADT: 34,801

SR 6

Good

Over: ROCK CREEK

1.9 E PACIFIC CO, Lewis, WA

Built 2015 Load: 38.2 t ADT: 1,561

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.