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)

JACKSON HWY

Good

Over: BRANCH LACAMAS CR.

2.49 S JCT US 12, Lewis, WA

Built 1926 Load: 13.6 t ADT: 985

JACKSON HWY

Good

Over: LACAMAS CR.

2.72 S JCT US 12, Lewis, WA

Built 1926 Load: 13.6 t ADT: 985

JACKSON HWY

Good

Over: LACAMAS CR.

2.76 S JCT US 12, Lewis, WA

Built 1926 Load: 13.6 t ADT: 936

SR 505

Good

Over: SALMON CREEK

13.5 E JCT I-5, Lewis, WA

Built 1951 Load: 15.2 t ADT: 584

US 12

Good

Over: SMITH CR

12.9 E JCT SR 131, Lewis, WA

Built 1962 Load: 16.2 t ADT: 2,593

FAS 1027

Good

Over: BN RR TOWER AVE NORTHUP

00.0 S JCT. CHESTNU, Lewis, WA

Built 1971 Load: 16.3 t ADT: 5,740

FAS 1027

Good

Over: BN RR GOLD ST NORTHUP S

00.0 N JCT. SUMMA S, Lewis, WA

Built 1971 Load: 16.3 t ADT: 5,843

SR 508

Good

Over: CINEBAR CREEK

19.5 E JCT I-5, Lewis, WA

Built 1946 Load: 17.5 t ADT: 1,171

STEVENS CANYON ROA

Good

Over: RAVINE

12.1 MI. W. OF JCT. HWY., Lewis, WA

Built 1955 Load: 18.1 t ADT: 1,500

PANISCO ROAD

Good

Over: MILL CREEK

9.0 E ONALASKA, Lewis, WA

Built 1973 Load: 19.0 t ADT: 45

HENRIOT ROAD

Good

Over: LACAMAS CREEK

3.5 N TOLEDO, Lewis, WA

Built 1975 Load: 19.0 t ADT: 304

FAIR ST EXTENSION

Good

Over: SALZER CREEK

E. C/L CENTRALIA, Lewis, WA

Built 1971 Load: 19.0 t ADT: 66

US 12

Good

Over: LACAMAS CREEK

6.7 E JCT I-5, Lewis, WA

Built 1921 Load: 19.8 t ADT: 10,017

SR 122

Good

Over: TILTON RIVER

3.6 E JCT US 12, Lewis, WA

Built 1961 Load: 20.0 t ADT: 739

INDEPENDENCE ROAD

Good

Over: INDEPENDENCE CREEK

0.23 N JCT 10000, Lewis, WA

Built 1956 Load: 20.0 t ADT: 523

US 12

Good

Over: HALL CREEK

14.0 E JCT SR 131, Lewis, WA

Built 1928 Load: 20.4 t ADT: 2,593

US 12

Good

Over: DAVIS CREEK

6.8 E JCT SR 131, Lewis, WA

Built 1957 Load: 20.7 t ADT: 2,648

FRASE RD.

Good

Over: KEARNEY CR.

0.22 S JCT. SR.508, Lewis, WA

Built 1967 Load: 21.8 t ADT: 4

SR 122

Good

Over: COWLITZ RIVER

6.6 E JCT US 12, Lewis, WA

Built 1961 Load: 22.7 t ADT: 777

GOODRICH ROAD

Good

Over: CHEHALIS SLOUGH

1.0 N CENTRALIA, Lewis, WA

Built 1961 Load: 22.7 t ADT: 180

CARR ROAD

Good

Over: CARR CREEK

2.74 MILES S. US HWY 12, Lewis, WA

Built 2009 Load: 22.7 t ADT: 10

PLEASANT VALLEY RD

Good

Over: UNNAMED TRIBUTARY

2.5 NW JCT SR 7, Lewis, WA

Built 2017 Load: 23.7 t ADT: 13

US 12

Good

Over: COWLITZ R OVERFLOW

8.5 E JCT SR 131, Lewis, WA

Built 1958 Load: 24.0 t ADT: 2,648

GARRARD CREEK RD.

Good

Over: INDEPENDENCE CREEK

0.23 W JCT 91008, Lewis, WA

Built 1965 Load: 24.5 t ADT: 192

HAYWIRE ROAD

Good

Over: STEARNS CREEK

2.65 West Of Napavine, Lewis, WA

Built 1940 Load: 24.5 t ADT: 238

BISHOP ROAD

Good

Over: DILLENBAUGH CREEK

1.11 SW CHEHALIS, Lewis, WA

Built 1955 Load: 24.5 t ADT: 3,654

NO DATA ENTERED

Good

Over: BUTTER CREEK

4.2 MILES NW FROM HWY12 O, Lewis, WA

Built 1963 Load: 25.4 t ADT: 8

ALVORD ROAD

Good

Over: SALZER CREEK

0.5 E CENTRALIA, Lewis, WA

Built 1964 Load: 25.4 t ADT: 25

W. Maple St

Good

Over: China Creek

W.of Tower Ave, Lewis, WA

Built 2003 Load: 25.4 t ADT: 1,414

US 12

Good

Over: KIONA CREEK

12.9 E JCT SR 7, Lewis, WA

Built 1925 Load: 26.2 t ADT: 4,752

ELK CREEK RD

Good

Over: EIGHT CR.

3.W OF DOTY, Lewis, WA

Built 1983 Load: 26.3 t ADT: 95

STEVENS CANYON ROA

Good

Over: RAVINE

12.1 MILES WEST OF JCT. U, Lewis, WA

Built 1955 Load: 26.3 t ADT: 1,500

SR 12

Good

Over: HOPKIN CREEK

5.5 E JCT SR 131, Lewis, WA

Built 1958 Load: 26.6 t ADT: 2,648

CHANDLER ROAD

Good

Over: DUNN CREEK

1.0 N DRYAD, Lewis, WA

Built 1962 Load: 27.2 t ADT: 69

PETERS RD.

Good

Over: PETERS CR.

0.26 S JCT SR 12, Lewis, WA

Built 1964 Load: 27.2 t ADT: 192

PETERS RD.

Good

Over: PETERS CR.

0.73 S JCT SR 12, Lewis, WA

Built 1964 Load: 27.2 t ADT: 244

SR 131

Good

Over: SILER CREEK

0.4 N JCT NATL FOREST BD, Lewis, WA

Built 1965 Load: 28.2 t ADT: 305

MIDDLE FORK ROAD

Good

Over: MIDDLE FORK NEWAUKUM

2.5 N JCT SR 508, Lewis, WA

Built 2019 Load: 28.2 t ADT: 482

BRIM CREEK ROAD

Good

Over: STILLWATER CREEK

2.0 W VADER, Lewis, WA

Built 1960 Load: 29.0 t ADT: 95

ROUNDTOP ROAD

Good

Over: ROUND TOP CREEK

1.0 SW MINERAL, Lewis, WA

Built 1989 Load: 29.0 t ADT: 18

US 12

Good

Over: KLICKITAT CREEK

4.0 E JCT SR 122, Lewis, WA

Built 1937 Load: 29.9 t ADT: 6,490

MARSH AVENUE

Good

Over: CHINA CREEK

00.1 N JCT. SR507, Lewis, WA

Built 1994 Load: 30.1 t ADT: 553

SR 508

Good

Over: GHEER CREEK

7.6 E JCT I-5, Lewis, WA

Built 1947 Load: 30.8 t ADT: 4,269

PLEASANT VALLEY RD

Good

Over: STEARNS CREEK

3.0 SW.NAPAVINE, Lewis, WA

Built 1982 Load: 30.8 t ADT: 407

SR 6

Good

Over: JONES CREEK

5.7 E PACIFIC CO, Lewis, WA

Built 1931 Load: 31.1 t ADT: 2,463

US 12

Good

Over: CREEK TWIN CANYON

2.6 E JCT SR 122, Lewis, WA

Built 1967 Load: 31.7 t ADT: 4,729

STOWELL ROAD

Good

Over: MILL CREEK

0.5 N SALKUM, Lewis, WA

Built 1955 Load: 31.7 t ADT: 325

SCHEUBER ROAD

Good

Over: ALEXANDER CR.

1.7 N JCT SR 6, Lewis, WA

Built 1978 Load: 31.7 t ADT: 888

MASCHKE ROAD

Good

Over: STILLWATER CREEK

1.0 W VADER, Lewis, WA

Built 1974 Load: 31.7 t ADT: 37

FAS 1198

Good

Over: BNRR WARD STREET

00.0 JCT. W B ST., Lewis, WA

Built 1980 Load: 31.7 t ADT: 3,993

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.