Total bridges
419
Public highway bridges in Lewis County
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.
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
- 1910s 2
1910–1919
2 bridges
- 1920s 21
1920–1929
21 bridges
- 1930s 17
1930–1939
17 bridges
- 1940s 29
1940–1949
29 bridges
- 1950s
1950–1959
108 bridges
- 1960s
1960–1969
64 bridges
- 1970s
1970–1979
57 bridges
- 1980s 27
1980–1989
27 bridges
- 1990s 26
1990–1999
26 bridges
- 2000s 26
2000–2009
26 bridges
- 2010s 29
2010–2019
29 bridges
- 2020s 13
2020–2029
13 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.
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.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Snohomish County | 500 | 49% | 47% | 4% | 1980 |
| Pierce County | 472 | 55.3% | 40.5% | 4.2% | 1974 |
| Lewis County (this page) | 419 | 39.4% | 56.8% | 3.8% | 1969 |
| Grays Harbor County | 363 | 48.8% | 41.9% | 9.4% | 1978 |
| Whatcom County | 354 | 44.1% | 50.6% | 5.4% | 1970 |
| Whitman County | 347 | 52.2% | 44.4% | 3.5% | 1974 |
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).
- Kay County, OK · 419 bridges
- Taylor County, TX · 419 bridges
- Santa Barbara County, CA · 418 bridges
- Lucas County, OH · 418 bridges
Similar average build year
Nearest mean year-built outside WA (1969 here).
- Cook County, IL · avg 1969 · 1,721 bridges
- Fresno County, CA · avg 1969 · 916 bridges
- Cuyahoga County, OH · avg 1969 · 871 bridges
- Ventura County, CA · avg 1969 · 501 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (238)
WILSON ROAD
FairOver: KLICKITAT CREEK
2.0 W MOSSYROCK, Lewis, WA
Built 1957 Load: 37.2 t ADT: 105
KIONA RD
FairOver: KIONA CR.
0.35 SW JCT 75990, Lewis, WA
Built 1962 Load: 37.2 t ADT: 724
DEEP CREEK ROAD
FairOver: DEEP CREEK
03.45 N JCT 24034, Lewis, WA
Built 1978 Load: 37.2 t ADT: 55
KING ROAD
FairOver: KING CREEK
1.6 W WINLOCK, Lewis, WA
Built 1958 Load: 37.2 t ADT: 225
DEEP CREEK ROAD
FairOver: DEEP CREEK
3.18 N JCT 24034, Lewis, WA
Built 1978 Load: 38.1 t ADT: 66
KOLLOCK RD
FairOver: OLEQUA CREEK
0.19 SE JCT.93000, Lewis, WA
Built 1977 Load: 38.1 t ADT: 45
PLUM ST
FairOver: CHINA CREEK
.2 N JCT. SR 507, Lewis, WA
Built 1944 Load: 38.1 t ADT: 147
ROUNDTREE ROAD
FairOver: LOST VALLEY CREEK
0.5 W BOISTFORT, Lewis, WA
Built 1960 Load: 39.0 t ADT: 32
WALKER ROAD
FairOver: BRANCH FOSTER CREEK
2.5 SW TOLEDO, Lewis, WA
Built 1957 Load: 39.0 t ADT: 76
SPENCER ROAD
FairOver: BLUE CREEK
5.5 SW SALKUM, Lewis, WA
Built 1958 Load: 39.0 t ADT: 363
CHILVERS RD.
FairOver: MILL CR.
1.00 N LITTELL, Lewis, WA
Built 1980 Load: 39.0 t ADT: 774
ELK CREEK RD.
FairOver: ELK CREEK
0.02 W JCT 26890, Lewis, WA
Built 1952 Load: 39.9 t ADT: 95
JACKSON HWY
FairOver: NEWAUKUM OVERFLOW
2.56 N JCT SR 508, Lewis, WA
Built 1926 Load: 39.9 t ADT: 3,427
JACKSON HWY.
FairOver: NEWAUKUM OVERFLOW
2.49 N JCT SR 508, Lewis, WA
Built 1926 Load: 39.9 t ADT: 3,427
JACKSON HWY.
FairOver: NEWAUKUM OVERFLOW
2.45 N JCT SR 508, Lewis, WA
Built 1926 Load: 39.9 t ADT: 3,427
NO DATA ENTERED
FairOver: LITTLE NISQUALLY RIVER
12.9 MILES WEST OF HWY 7, Lewis, WA
Built 1974 Load: 40.0 t ADT: 30
LABREE ROAD
FairOver: NEWAUKUM RIVER
1.0 S CHEHALIS, Lewis, WA
Built 1970 Load: 41.7 t ADT: 750
US 12
FairOver: JOHNSON CR
13.3 E JCT SR 131, Lewis, WA
Built 1962 Load: 42.6 t ADT: 2,593
BAKER ROAD
FairOver: SMITH CREEK
3.0 SW PACKWOOD, Lewis, WA
Built 1936 Load: 42.6 t ADT: 23
LINCOLN CREEK RD
FairOver: LINCOLN CR.
0.02 E JCT 10008, Lewis, WA
Built 1997 Load: 42.6 t ADT: 269
DREWS PRAIRIE ROAD
FairOver: LACAMAS CREEK
1.0 W TOLEDO, Lewis, WA
Built 1971 Load: 43.5 t ADT: 309
NO DATA ENTERED
FairOver: SKATE CREEK
5.7 MILES NE OF HWY12 ON, Lewis, WA
Built 1990 Load: 44.0 t ADT: 371
CRAIG RD.
FairOver: SKATE CREEK
1.5 NW PACKWOOD, Lewis, WA
Built 1978 Load: 44.4 t ADT: 125
I-5
FairOver: SR 507 MELLEN ST
3.7 N JCT SR 6, Lewis, WA
Built 1951 Load: 45.4 t ADT: 65,245
SR 6 RAMP TO SB I5
FairOver: DILLENBAUGH CR
6.3 E JCT SR 603, Lewis, WA
Built 1976 Load: 45.4 t ADT: 3,450
BAKER ROAD
FairOver: VEACH CREEK
2.9 SW PACKWOOD, Lewis, WA
Built 1936 Load: 45.4 t ADT: 18
JORGENSEN RD.
FairOver: S.FORK NEWAUKUM RIVER
0.44 SE JCT SR 508, Lewis, WA
Built 1996 Load: 45.4 t ADT: 798
CANNON RD.
FairOver: BUTTER CREEK
2.83 N JCT US 12, Lewis, WA
Built 1976 Load: 46.3 t ADT: 757
LEONARD ROAD
FairOver: S. FORK NEWAUKUM RIVER
0.3 S. ONALASKA, Lewis, WA
Built 1992 Load: 47.2 t ADT: 1,929
CLINE ROAD
FairOver: KILBORN CR
8.0 E RANDAL, Lewis, WA
Built 2000 Load: 47.2 t ADT: 45
GALVIN RD.
FairOver: CHEHALIS RIVER OVERFLOW
1.23 WEST JCT 91000, Lewis, WA
Built 1993 Load: 49.9 t ADT: 1,941
US 12
FairOver: SILVER CREEK
1.7 E JCT SR 131, Lewis, WA
Built 1957 Load: 50.8 t ADT: 4,072
GISH ROAD
FairOver: S FK NEWAUKUM RIVER
4.0 W ONALASKA, Lewis, WA
Built 1996 Load: 50.8 t ADT: 495
TAUSCHER ROAD
FairOver: MID FK NEWAUKUM RIVER
2.0 E FOREST, Lewis, WA
Built 1951 Load: 57.0 t ADT: 39
NORTH FORK ROAD
FairOver: N FORK NEWAUKUM R
0.7 NE JCT 94000, Lewis, WA
Built 2000 Load: 58.0 t ADT: 1,259
JONES ROAD
FairOver: SO. FORK CHEHALIS RIVER
6.0 S BOISTFORT, Lewis, WA
Built 2004 Load: 64.4 t ADT: 11
US 12
FairOver: OLIVER CREEK
15.3 E JCT SR 7, Lewis, WA
Built 1926 Load: 67.1 t ADT: 4,752
MINERAL CREEK ROAD
FairOver: MINERAL CREEK
1.8 E MINERAL, Lewis, WA
Built 2005 Load: 67.1 t ADT: 168
Read our methodology - how this data is sourced, computed, and verified.
Related
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.