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)

CORNWALL AVENUE

Fair

Over: WHATCOM CREEK

0.07 N JCT FLORA/YORK, Whatcom, WA

Built 1968 Load: 96.9 t ADT: 8,000

OLD SAMISH HWY

Fair

Over: CHUCKANUT CREEK

1.5 E MI CHUCKANUT, Whatcom, WA

Built 1960 Load: 96.9 t ADT: 600

NB SR 539

Good

Over: NOOKSACK R OVERFLOW

1.7 N JCT SR 544, Whatcom, WA

Built 1950 Load: 13.3 t ADT: 8,300

19TH ST

Good

Over: CHUCKANUT CREEK

0.1 S JCT RAINIER AVE, Whatcom, WA

Built 2021 Load: 13.6 t ADT: 20

FERNDALE RD

Good

Over: SLOUGH

01.7 S. SLATER RD., Whatcom, WA

Built 1979 Load: 16.2 t ADT: 1,643

SR 542

Good

Over: GALENA CREEK

27.5 E JCT SR 547, Whatcom, WA

Built 1945 Load: 16.8 t ADT: 621

RIVER RD

Good

Over: FISH TRAP CREEK

01.2 SW FLYNN ROAD, Whatcom, WA

Built 2004 Load: 17.5 t ADT: 140

GARRISON RD

Good

Over: JOHNSON CR

2.6 N JCT SR 546, Whatcom, WA

Built 1945 Load: 18.1 t ADT: 624

SB SR 539

Good

Over: WISER LAKE

0.9 N JCT SR 544, Whatcom, WA

Built 1947 Load: 18.8 t ADT: 8,382

HILLAIRE RD

Good

Over: RED RIVER

0.01 S of N Red River RD, Whatcom, WA

Built 1997 Load: 19.4 t ADT: 284

MARINE DR

Good

Over: MARIETTA SLOUGH

.3 E NOOKSACK R, Whatcom, WA

Built 1978 Load: 20.1 t ADT: 4,009

SR 542

Good

Over: RAZORHONE CREEK

28.4 E JCT SR 547, Whatcom, WA

Built 1946 Load: 20.4 t ADT: 621

I-5

Good

Over: KENTUCKY ST

3.2 N JCT SR 11, Whatcom, WA

Built 1958 Load: 20.4 t ADT: 61,810

I-5

Good

Over: NULLE RD

0.2 N SKAGIT CO, Whatcom, WA

Built 1964 Load: 20.4 t ADT: 22,967

LAKE WHATCOM BLVD

Good

Over: UNNAMED CREEK

01.3 SE LAKE LOUISE, Whatcom, WA

Built 2006 Load: 20.4 t ADT: 1,880

Alaska Ferry

Good

Over: Belligham Bay

.01 N. Harris Ave, Whatcom, WA

Built 1989 Load: 20.7 t ADT: 10

LAUREL RD W

Good

Over: TEN MILE CR

0.3 E.OF N.W. RD., Whatcom, WA

Built 1933 Load: 20.9 t ADT: 961

MOSQUITO LK RD

Good

Over: JOHNSON CR

4.6 NE VALLEY HWY, Whatcom, WA

Built 2004 Load: 20.9 t ADT: 337

KICKERVILLE RD

Good

Over: CALIFORNIA CR

00.2 S LOOMIS TO RD, Whatcom, WA

Built 1956 Load: 21.8 t ADT: 951

HERON LN

Good

Over: JOHNSON CR

00.18 S JONES RD, Whatcom, WA

Built 1944 Load: 22.0 t ADT: 10

RATHBONE RD

Good

Over: BERTRAND CREEK

00.8 S B.B.-LYN. RD, Whatcom, WA

Built 1950 Load: 22.7 t ADT: 1,522

SR 20

Good

Over: THORNTON CREEK

0.6 E SKAGIT CO, Whatcom, WA

Built 1980 Load: 23.3 t ADT: 1,971

ROAD

Good

Over: SULPHUR CR

NO DATA ENTERED, Whatcom, WA

Built 1954 Load: 23.6 t ADT: 30

OLD GUIDE RD

Good

Over: TEN MILE CR

00.1 N W.HEMMI RD, Whatcom, WA

Built 1933 Load: 23.6 t ADT: 887

ARNIE RD

Good

Over: CALIFORNIA CR

00.1 E. VALLEY VIEW, Whatcom, WA

Built 2004 Load: 24.5 t ADT: 190

SR 9

Good

Over: SMITH CREEK

0.5 N JCT SR 542, Whatcom, WA

Built 1946 Load: 24.6 t ADT: 3,984

KELLY RD

Good

Over: ANDERSON CR

00.4 W SAND RD, Whatcom, WA

Built 1939 Load: 24.6 t ADT: 450

HANNEGAN RD

Good

Over: SCOTT DITCH

00.6 N VanDyke, Whatcom, WA

Built 2009 Load: 24.9 t ADT: 9,000

FRASER STREET

Good

Over: CEMETERY CREEK

0.06 W OF VALENCIA ST, Whatcom, WA

Built 2000 Load: 24.9 t ADT: 4,000

SR 9

Good

Over: OVERFLOW CHANNEL

0.1 N JCT SR 542, Whatcom, WA

Built 1945 Load: 25.9 t ADT: 3,984

SR 547

Good

Over: SUMAS RIVER

10.2 N JCT SR 542, Whatcom, WA

Built 1952 Load: 26.2 t ADT: 1,868

SR 546

Good

Over: JOHNSON CREEK

7.2 E JCT SR 539, Whatcom, WA

Built 1961 Load: 26.6 t ADT: 4,524

LINDSAY RD

Good

Over: SUMAS RIVER

00.2 W GARRISON RD, Whatcom, WA

Built 1997 Load: 26.9 t ADT: 267

SR 20

Good

Over: SIDEHILL

8.6 E SKAGIT CO, Whatcom, WA

Built 1962 Load: 28.1 t ADT: 866

SR 9

Good

Over: BLACK SLOUGH

10.0 N SKAGIT CO, Whatcom, WA

Built 1900 Load: 28.8 t ADT: 3,307

SR 9

Good

Over: DRAINAGE CHANNEL

5.9 N SKAGIT CO, Whatcom, WA

Built 1945 Load: 29.0 t ADT: 2,658

ROAD

Good

Over: LITTLE SANDY CREEK

MP16.8 ON RD 11, Whatcom, WA

Built 1964 Load: 29.1 t ADT: 382

NO DATA ENTERED

Good

Over: BEAVER CREEK TRIB.

.67 MILES FROM RD. #11, Whatcom, WA

Built 2003 Load: 29.5 t ADT: 50

ROAD

Good

Over: THOMPSON CREEK

MP 2.0 RD #3910, Whatcom, WA

Built 2003 Load: 29.5 t ADT: 2

NO DATA ENTERED

Good

Over: BEAVER CREEK TRIB.

.51 MILES FROM RD. #11, Whatcom, WA

Built 2003 Load: 29.8 t ADT: 50

SR 20

Good

Over: SKAGIT R

9.6 E SKAGIT CO, Whatcom, WA

Built 1960 Load: 29.9 t ADT: 1,502

SR 539

Good

Over: NOOKSACK R OVERFLOW

1.5 N JCT SR 544, Whatcom, WA

Built 2009 Load: 29.9 t ADT: 16,600

NORTHWOOD RD

Good

Over: FISH TRAP CR

00.2 S E BOUNDARY, Whatcom, WA

Built 1950 Load: 29.9 t ADT: 300

MARINE DR

Good

Over: PORTAGE SLOUGH

0.06 MI. W FERNDALE, Whatcom, WA

Built 1997 Load: 31.8 t ADT: 3,741

SR 544

Good

Over: NOOKSACK RIVER

7.6 E JCT SR 539, Whatcom, WA

Built 1994 Load: 32.7 t ADT: 9,956

DEPOT RD

Good

Over: FISHTRAP CR

0.6 N FRONT ST, Whatcom, WA

Built 1992 Load: 32.7 t ADT: 6,187

Aaron Drive

Good

Over: FISHTRAP CREEK

0.3 S SR 546, Whatcom, WA

Built 1999 Load: 32.7 t ADT: 2,536

SQUALICUM PKWY

Good

Over: SQUALICUM CR

0.1 MI N OF BIRCHWOOD AVE, Whatcom, WA

Built 2020 Load: 32.7 t ADT: 6,200

SR 539

Good

Over: DUFFNER DITCH

3.6 N JCT SR 544, Whatcom, WA

Built 2023 Load: 32.8 t ADT: 14,149

SR 542

Good

Over: SQUALICUM CREEK

3.4 E JCT I-5, Whatcom, WA

Built 2023 Load: 32.8 t ADT: 32,277

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