Cowlitz County, WA

167 public highway bridges

Cowlitz County Bridge Snapshot

Cowlitz County, Washington contains 167 public highway bridges in the FHWA National Bridge Inventory. Roughly 35.9% are rated “Good,” 40.7% “Fair,” 3.6% “Poor,” and 3.6% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in WA are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

167

Total Bridges

35.9%

Good

3.6%

Poor

3.6%

Structurally Deficient

Condition Distribution

Good

35.9% (60)

Fair

40.7% (68)

Poor

3.6% (6)

SD

3.6% (6)

All Bridges (167)

Sort:

WEYERHAEUSER RR

Over: STATE ROUTE 411

3.4 N JCT SR 432, Cowlitz, WA

Built 1958 ADT: 13,790

SR 4

Over: COWLITZ R / RR / SR 411

1.8 N JCT SR 432, Cowlitz, WA

Built 1951 ADT: 12,080

SR 432

Over: I-5

15.9 N JCT SR 503, Cowlitz, WA

Built 1959 ADT: 46,604

I-5 N-W RAMP

Over: SR 432 E-S RAMP

2.7 E JCT SR 411, Cowlitz, WA

Built 1959 ADT: 2,536

SR 432

Over: 3RD AVE / SR 411

JCT SR 432, Cowlitz, WA

Built 1961 ADT: 17,087

I-5

Over: SR 503

23.1 N JCT SR 503 SPUR, Cowlitz, WA

Built 1963 ADT: 18,958

I-5

Over: SR 503

23.1 N JCT SR 503 SPUR, Cowlitz, WA

Built 1963 ADT: 18,958

OAK STREET

Over: I-5

9.6 N JCT SR 503, Cowlitz, WA

Built 1968 ADT: 67,764

OLD PACIFIC HWY N

Over: I-5

2.8 N JCT SR 504, Cowlitz, WA

Built 1968 ADT: 44,018

KALAMA R RD

Over: I-5

11.1 N JCT SR 503, Cowlitz, WA

Built 1970 ADT: 70,091

BN RY (NP)

Over: W-S RAMP TO I-5

1.6 N JCT SR 503, Cowlitz, WA

Built 1972 ADT: 3,563

BNRR

Over: DIKE ACCESS ROAD

1.6 N JCT SR 503, Cowlitz, WA

Built 1972 ADT: 6,096

I-5

Over: HUNTINGTON AVE

8.1 N JCT SR 4, Cowlitz, WA

Built 1975 ADT: 2,204

I-5

Over: HUNTINGTON AVE

8.1 N JCT SR 4, Cowlitz, WA

Built 1975 ADT: 2,204

POWELL RD

Over: I-5

9.3 N JCT SR 4, Cowlitz, WA

Built 1975 ADT: 51,651

SR 504

Over: I-5

10.0 N JCT SR 4, Cowlitz, WA

Built 1975 ADT: 41,919

LEXINGTON BR DR

Over: I-5

2.8 N JCT SR 4, Cowlitz, WA

Built 1975 ADT: 53,311

PLEASANT HILL RD

Over: I-5

3.3 N JCT SR 4, Cowlitz, WA

Built 1975 ADT: 57,364

HEADQUARTERS RD

Over: I-5

6.3 N JCT SR 4, Cowlitz, WA

Built 1975 ADT: 55,519

SR 432

Over: SR 411/3RD AVE

JCT SR 432, Cowlitz, WA

Built 1975 ADT: 17,087

I-5

Over: KELSO AVE (OLD SR 431)

0.9 N JCT SR 4, Cowlitz, WA

Built 1979 ADT: 4,172

I-5

Over: KELSO AVE (OLD SR 431)

0.9 N JCT SR 4, Cowlitz, WA

Built 1980 ADT: 4,172

GRADE ST

Over: I-5

2.2 N JCT SR 432, Cowlitz, WA

Built 1979 ADT: 57,306

I-5

Over: ALLEN ST / SR 4

1.3 E JCT SR 411 SP, Cowlitz, WA

Built 1981 ADT: 16,067

I-5

Over: ALLEN ST/SR 4

1.3 E JCT SR 411 SP, Cowlitz, WA

Built 1980 ADT: 16,067

BRYNION ST

Over: I-5

0.6 N JCT SR 4, Cowlitz, WA

Built 1980 ADT: 55,996

SR 504

Over: SR 504 TURNAROUND

22.2 E JCT SR 504 SP, Cowlitz, WA

Built 1992 ADT: 586

S-W RAMP

Over: W-W RAMP

JCT I-5, Cowlitz, WA

Built 2011 ADT: 1,751

SR 432 E-S RAMP

Over: SR 432 E-E RAMP

JCT I-5, Cowlitz, WA

Built 2011 ADT: 2,007

LOGTRUCK XING

Over: SOUTH TOUTLE ROAD

2.71S SPIRIT LK HW, Cowlitz, WA

Built 1900 ADT: 800

RR GRADE CROSSING

Over: SOUTH TOUTLE ROAD

2.74(S)SPIRIT LK H, Cowlitz, WA

Built 1900 ADT: 800

RR GRADE XING

Over: ALPHA DRIVE

.02 W SR 411, Cowlitz, WA

Built 1900 ADT: 1,915

RR GRADE XING

Over: NEVADA DRIVE

.01 W SR 411, Cowlitz, WA

Built 1900 ADT: 664

ALLENDER RD

Over: STILLWATER CREEK

0.74 W OF SR 506(MP 0.86), Cowlitz, WA

Built 1958 Load: 2.7 t ADT: 20

ALLENDER RD

Over: STILLWATER CREEK

0.36 W SR 506 (MP 0.86), Cowlitz, WA

Built 1953 Load: 4.5 t ADT: 20

CLINE RD

Over: ARKANSAS CREEK

0.57 N DELAMETER RD (0.89, Cowlitz, WA

Built 1959 Load: 10.9 t ADT: 115

ALLENDER RD

Over: STILLWATER CREEK

0.97 W SR 506 (MP 0.86), Cowlitz, WA

Built 1955 Load: 12.7 t ADT: 20

WREN LOOP RD

Over: ARKANSAS CREEK

0.02 S DELAMETER RD (0.17, Cowlitz, WA

Built 1960 Load: 13.6 t ADT: 195

ABERNATHY CREEK RD

Over: ABERNATHY CREEK

5.62 N OF SR 4 (MP 48.32), Cowlitz, WA

Built 1976 Load: 15.2 t ADT: 200

I-5

Over: COWEEMAN RIVER

2.0 N JCT SR 432, Cowlitz, WA

Built 1979 Load: 15.6 t ADT: 28,653

EAST CC ST

Over: LEWIS RIVER

0.14 E SR 503 (MP 54.31), Cowlitz, WA

Built 1966 Load: 16.2 t ADT: 6,628

BARNES DR

Over: HILL CREEK

4.10 N of I-5 Exit 32, Cowlitz, WA

Built 1923 Load: 16.3 t ADT: 300

ROSE VALLEY RD

Over: GOBLE CREEK

5.65 E OLD 99 S (MP 1.06), Cowlitz, WA

Built 1958 Load: 17.2 t ADT: 750

I-5

Over: COWEEMAN RIVER

1.4 N JCT SR 432, Cowlitz, WA

Built 1979 Load: 17.5 t ADT: 28,653

OSTRANDER RD

Over: OSTRANDER CREEK

0.39 E PAC AVE N (MP 3.63, Cowlitz, WA

Built 1962 Load: 18.1 t ADT: 1,600

DELAMETER RD

Over: DELAMETER CREEK

0.91 W SR 411 (MP 11.33), Cowlitz, WA

Built 1957 Load: 18.1 t ADT: 1,203

MODROW RD

Over: KALAMA RIVER

0.01 S KAL RIV RD (1.23), Cowlitz, WA

Built 1958 Load: 18.1 t ADT: 795

DELAMETER RD

Over: DELAMETER CREEK

1.56 W SR411 (MP 11.33), Cowlitz, WA

Built 1954 Load: 18.1 t ADT: 1,176

I-5

Over: COWEEMAN RIVER

2.0 N JCT SR 432, Cowlitz, WA

Built 1979 Load: 18.8 t ADT: 28,653

SR 504

Over: HOFFSTADT CREEK

8.4 E JCT SR 504 SP, Cowlitz, WA

Built 1991 Load: 18.8 t ADT: 648

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 5, 2026