Whatcom County, WA

358 public highway bridges

Whatcom County Bridge Snapshot

Whatcom County, Washington contains 358 public highway bridges in the FHWA National Bridge Inventory. Roughly 38.3% are rated “Good,” 46.6% “Fair,” 5.3% “Poor,” and 5.3% 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.

358

Total Bridges

38.3%

Good

5.3%

Poor

5.3%

Structurally Deficient

Condition Distribution

Good

38.3% (137)

Fair

46.6% (167)

Poor

5.3% (19)

SD

5.3% (19)

All Bridges (358)

Sort:

HAXTON WY

Over: RED RIVER

00.70 S OF SLATER, Whatcom, WA

Built 1920 Load: 29.8 t ADT: 5,592

FLYNN RD

Over: FISHTRAP CR

00.4 SW B.B. LYNDEN, Whatcom, WA

Built 1988 Load: 29.9 t ADT: 125

ROAD

Over: SWIFT CREEK

NO DATA ENTERED, Whatcom, WA

Built 1981 Load: 30.0 t ADT: 203

W. FRONT ST.

Over: JOHNSON CR

3.8 N JCT SR 546, Whatcom, WA

Built 1962 Load: 30.5 t ADT: 575

SR 20

Over: HALF BR STA 163

6.1 E SKAGIT CO, Whatcom, WA

Built 1962 Load: 30.8 t ADT: 1,732

NULLE RD

Over: FRIDAY CR

00.4 E W LK SAMISH, Whatcom, WA

Built 1934 Load: 31.1 t ADT: 851

I-5

Over: DAKOTA CR & WEST RD

7.9 N JCT SR 548, Whatcom, WA

Built 1961 Load: 31.7 t ADT: 7,554

I-5

Over: DAKOTA CR & WEST RD

7.9 N JCT SR 548, Whatcom, WA

Built 1961 Load: 31.7 t ADT: 7,554

ROAD

Over: WALLACE CREEK

NO DATA ENTERED, Whatcom, WA

Built 2002 Load: 32.2 t ADT: 12

SR 542

Over: MAPLE CREEK

3.3 E JCT SR 547, Whatcom, WA

Built 1900 Load: 32.7 t ADT: 1,937

FRONT STREET

Over: FISHTRAP CREEK

0.3 E SR539, Whatcom, WA

Built 1947 Load: 32.7 t ADT: 6,187

GRAND AVENUE

Over: WHATCOM CREEK

GRAND & WHATCOM CRK, Whatcom, WA

Built 1949 Load: 32.7 t ADT: 2,800

SR 20

Over: HALF BR STA 155

5.9 E SKAGIT CO, Whatcom, WA

Built 1900 Load: 33.6 t ADT: 1,732

SLATER RD

Over: NOOKSACK RIVER

02.43 W OF NW DR, Whatcom, WA

Built 1957 Load: 33.7 t ADT: 12,802

HAMPTON RD

Over: KAMM SLOUGH

01.6 W Northwood Road, Whatcom, WA

Built 2010 Load: 34.3 t ADT: 2,400

I-5

Over: WHATCOM CREEK

2.9 N JCT SR 11, Whatcom, WA

Built 1957 Load: 35.0 t ADT: 30,905

SR 20

Over: LILLIAN CR

19.8 E SKAGIT CO, Whatcom, WA

Built 1971 Load: 36.3 t ADT: 1,257

BIRCH BAY LYNDEN

Over: BERTRAND CR

00.3 W.RATHBONE RD., Whatcom, WA

Built 1949 Load: 36.3 t ADT: 8,369

BAKER LK RD

Over: SANDY CR

03.85 N SKAGIT LINE, Whatcom, WA

Built 1957 Load: 36.3 t ADT: 916

SR 542

Over: N FORK NOOKSACK RIVER

23.7 E JCT SR 547, Whatcom, WA

Built 1957 Load: 37.6 t ADT: 633

TURKINGTON RD

Over: MCCARTY CR

W HWY 9, Whatcom, WA

Built 1975 Load: 38.2 t ADT: 100

SR 20

Over: PANTHER CR

21.9 E SKAGIT CO, Whatcom, WA

Built 1972 Load: 39.0 t ADT: 1,257

NORTHWEST AVENUE

Over: SQUALLICUM WY,CRK,CMSTP&

1.5 NW. CITY HALL, Whatcom, WA

Built 1971 Load: 39.9 t ADT: 10,700

MARINE DR

Over: NOOKSACK RIVER

00.2 E FERNDALE RD., Whatcom, WA

Built 1936 Load: 40.5 t ADT: 3,900

SQUALLICUM WAY

Over: SQUALLICUM CREEK

BOX CUL 1 SQUALL WY, Whatcom, WA

Built 1970 Load: 40.5 t ADT: 4,200

SQUALLICUM WAY

Over: SQUALLICUM CREEK

BOX CUL 2 SQUALL WY, Whatcom, WA

Built 1970 Load: 40.5 t ADT: 4,200

SQUALLICUM WAY

Over: SQUALLICUM CREEK

BOX CUL 3 SQUALL WY, Whatcom, WA

Built 1970 Load: 40.5 t ADT: 4,200

I-5

Over: ORCHID DR/SQUALICUM CR

0.6 N JCT SR 542, Whatcom, WA

Built 1958 Load: 40.8 t ADT: 37,086

SR 542

Over: CHAIN UP CREEK

16.1 E JCT SR 547, Whatcom, WA

Built 2010 Load: 40.8 t ADT: 1,251

I-5

Over: ORCHID DR/SQUALICUM CR

0.6 N JCT SR 542, Whatcom, WA

Built 1958 Load: 41.7 t ADT: 37,086

SR 20

Over: THUNDER ARM BAY

13.8 E SKAGIT CO, Whatcom, WA

Built 1961 Load: 41.7 t ADT: 1,380

MASSEY RD

Over: SUMAS RIVER

00.2 E NOOKSACK RD., Whatcom, WA

Built 1950 Load: 42.1 t ADT: 326

GILES RD

Over: DAKOTA CR

.10 MI S OF MCGEE, Whatcom, WA

Built 1995 Load: 42.1 t ADT: 275

H STREET RD

Over: BERTRAND CR.

00.3 W JACKMAN RD., Whatcom, WA

Built 1995 Load: 42.8 t ADT: 1,248

WOBURN STREET

Over: WHATCOM CREEK

0.1 MI. S. IOWA ST., Whatcom, WA

Built 1989 Load: 43.4 t ADT: 11,900

SR 9

Over: SLOUGH

9.2 N SKAGIT CO, Whatcom, WA

Built 1952 Load: 45.4 t ADT: 3,307

NEWHALEM CAMPGROUN

Over: SKAGIT RIVER

100 feet South of Highway, Whatcom, WA

Built 1958 Load: 45.4 t ADT: 200

I-5

Over: WHATCOM CREEK

2.9 N JCT SR 11, Whatcom, WA

Built 1957 Load: 46.3 t ADT: 30,905

ROAD

Over: BAGLEY CREEK

NO DATA ENTERED, Whatcom, WA

Built 2007 Load: 46.3 t ADT: 50

DUPONT,PROSPECT ST

Over: WHATCOM CREEK

AT POST OFFICE, Whatcom, WA

Built 1920 Load: 46.3 t ADT: 8,700

CORNELL CREEK RD

Over: HENDRICKS CREEK

00.7 SE MTBAKER HWY, Whatcom, WA

Built 1967 Load: 47.2 t ADT: 62

SR 20

Over: GORGE CREEK

7.0 E SKAGIT CO, Whatcom, WA

Built 1955 Load: 49.9 t ADT: 1,732

ROAD

Over: MOROVITZ CREEK

NO DATA ENTERED, Whatcom, WA

Built 2009 Load: 55.4 t ADT: 50

ROAD

Over: ANDERSON CREEK

NO DATA ENTERED, Whatcom, WA

Built 2007 Load: 55.4 t ADT: 50

I-5

Over: LAKEWAY DRIVE

2.2 N JCT SR 11, Whatcom, WA

Built 1958 Load: 56.1 t ADT: 31,011

I-5

Over: LAKEWAY DRIVE

2.2 N JCT SR 11, Whatcom, WA

Built 1958 Load: 56.4 t ADT: 31,011

COMMERCIAL/YOUNG

Over: WHATCOM CREEK

COMMERCIAL/WHATCOM, Whatcom, WA

Built 1957 Load: 59.3 t ADT: 3,900

SMITH RD E

Over: ANDERSON CREEK

0.2 W OF SAND ROAD, Whatcom, WA

Built 2005 Load: 61.6 t ADT: 4,147

SR 20

Over: GOODELL CREEK

3.2 E SKAGIT CO, Whatcom, WA

Built 1972 Load: 63.5 t ADT: 1,732

SR 9

Over: CREEK

9.1 N SKAGIT CO, Whatcom, WA

Built 1952 Load: 65.3 t ADT: 3,307

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 6, 2026