County profile · official public datasets

Washington County, OR

326 public highway bridges tracked in the FHWA National Bridge Inventory: 35.6% rated Good, 62% Fair, 2.5% Poor.

326
Public bridges
35.6%
Good condition
2.5%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Washington County pairs a better-than-median Poor-condition share among rated counties in the state with a newer average build year than the state inventory.

Top 31%
lowest Poor share in state
2.5%
Poor-condition share
326
public highway bridges
1983
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.

Washington County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Washington County ranks #11 of 36 Oregon counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 2.5%). Washington County, Oregon contains 326 public highway bridges. Roughly 35.6% are rated “Good,” 62% “Fair,” and 2.5% “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

326

Public highway bridges in Washington County

Good condition

35.6%

116 of 326 rated 7-9

Fair condition

62%

202 of 326 rated 5-6

Poor condition

2.5%

8 of 326 rated 4 or below

In-state Poor-share rank

#11 of 36

Among Oregon counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 326 NBI-tracked bridges by lowest applicable component rating.

Good
35.6% (116)
Fair
62% (202)
Poor
2.5% (8)

Washington County's Poor-condition bridges carry 54,681 vehicle crossings a day

That is 1.1% of the county's reported daily bridge traffic on 2.5% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 6,835 crossings a day against 10,980 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 326 of 326 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

38.3% of Washington County's bridges have passed the 50-year mark

125 of the 326 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 35.6% 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 35.6% of the county's Poor-condition bridge traffic

ALLEN BLVD over HWY 144, built 1981, carries 19,471 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 8-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 54,681 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Washington County's bridges were built

326 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1970s, when 68 of the county's bridges still in the inventory were built, which is 20.9% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year is 1983, 8 years newer than the Oregon average of 1975.

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

How Washington County compares with Oregon's closest counties by inventory size

The 5 Oregon counties nearest Washington County in number of bridges, with their condition splits. Its 2.5% Poor share is the 3rd-lowest of these 6. Its average build year of 1983 against a peer-group mean of 1975 is 8 years newer.

Showing the 5 closest of 35 Oregon counties eligible for comparison.

Bridge inventory size and condition shares for Washington County and the 5 Oregon counties closest to it in inventory size
County Bridges Poor
Jackson County 401 1.5%
Marion County 373 4.3%
Clackamas County 367 2.5%
Washington County (this page) 326 2.5%
Umatilla County 321 4%
Coos County 254 3.1%

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 Washington 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 Washington County, both outside Oregon so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside OR (326 bridges here).

Similar average build year

Nearest mean year-built outside OR (1983 here).

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 326 Good 116 Fair 202 Poor 8

Good-condition bridges (116)

EVERS ROAD

Good

Over: WEST FORK DAIRY CREEK

007 MI S REILING ROAD, Washington, OR

Built 1984 Load: 10.7 t ADT: 332

CLAPSHAW HILL ROAD

Good

Over: GALES CREEK

0025 MI E GALES CREEK RD, Washington, OR

Built 2001 Load: 11.7 t ADT: 707

SUSBAUER ROAD

Good

Over: COUNCIL CREEK

0069 MI N HWY 8, Washington, OR

Built 2003 Load: 13.6 t ADT: 6,651

Hwy 29

Good

Over: Gales Creek

5.23 MI HILLSBORO CTY LIM, Washington, OR

Built 1975 Load: 17.5 t ADT: 11,189

WEST UNION ROAD

Good

Over: BETHANY CREEK

0.1 mi. E/O 185TH AVENUE, Washington, OR

Built 2008 Load: 19.4 t ADT: 2,518

N.W. STALEY RD.

Good

Over: DAIRY CREEK TRIB

011 MI W FISHER RD, Washington, OR

Built 1982 Load: 20.1 t ADT: 150

GREENER ROAD

Good

Over: E FK DAIRY CREEK

0005 MI E DAIRY CREEK RD, Washington, OR

Built 2006 Load: 20.4 t ADT: 156

US 26 (Hwy 047) WB

Good

Over: East Fork Dairy Creek

175 MI W PORTLAND SWCL, Washington, OR

Built 2010 Load: 22.0 t ADT: 11,519

OR 47 (Hwy 102)

Good

Over: Creek

.75 M S OF VERBOORT RD, Washington, OR

Built 2000 Load: 23.3 t ADT: 7,470

GREENVILLE ROAD

Good

Over: DAIRY CREEK OFLOW

010 MI W HWY 47, Washington, OR

Built 1997 Load: 23.6 t ADT: 957

Westgate Dr.

Good

Over: BEAVERTON CREEK

0.14 MI from Cedar Hills, Washington, OR

Built 2015 Load: 24.6 t ADT: 7,126

DENNEY RD CONN

Good

Over: FANNO CREEK

2.8 MI NW TIGARD CC, Washington, OR

Built 1979 Load: 24.9 t ADT: 10,470

MINTER BRIDGE ROAD

Good

Over: TUALATIN RIVER

018 MI S RIVER ROAD, Washington, OR

Built 2002 Load: 25.3 t ADT: 7,649

Greener Road

Good

Over: Rock Creek

North Plains, Washington, OR

Built 2009 Load: 25.6 t ADT: 25

MINTER BRIDGE ROAD

Good

Over: TUALATIN RIVER OVERFLOW

001 MI N TUALATIN RIVER, Washington, OR

Built 2002 Load: 25.9 t ADT: 7,649

WEST SHORE DRIVE

Good

Over: SAIN CREEK

0267 MI W SCOGGIN VALLEY, Washington, OR

Built 1974 Load: 27.2 t ADT: 458

OR 217 (HWY 144)

Good

Over: FANNO CREEK

0.4 M S OF ALLEN BLVD, Washington, OR

Built 1968 Load: 27.5 t ADT: 97,468

SCHOLLS FERRY RD.

Good

Over: FANNO CREEK

2.0 MI SW BEAVERTON CC, Washington, OR

Built 1992 Load: 27.5 t ADT: 33,891

BARNES RD

Good

Over: CEDAR MILL CREEK

005 MI W CEDAR HILLS BLVD, Washington, OR

Built 2005 Load: 28.1 t ADT: 20,157

MAIN ST

Good

Over: FANNO CREEK

0025 MI SOUTH PACIFIC HWY, Washington, OR

Built 1991 Load: 28.1 t ADT: 12,750

ROY ROGERS RD.

Good

Over: TUALATIN RV TRIBUTARY

.4 MI S OF SCHOLLS FRY RD, Washington, OR

Built 2000 Load: 28.5 t ADT: 17,354

OR 47 (Hwy 102)

Good

Over: Dairy Creek Overflow

32 MI N FOREST GROVE, Washington, OR

Built 1978 Load: 29.2 t ADT: 6,860

OR 47 (Hwy 102)

Good

Over: South Fork Dairy Creek

034 MI N FOREST GROVE, Washington, OR

Built 1942 Load: 29.8 t ADT: 6,860

STRINGTOWN ROAD

Good

Over: CARPENTER CREEK

001 MI W HWY 47, Washington, OR

Built 1998 Load: 30.8 t ADT: 1,559

MURTAUGH ROAD

Good

Over: WHISKEY CREEK

0045 M I W MEACHAM, Washington, OR

Built 2000 Load: 31.1 t ADT: 47

B Street

Good

Over: NAYLOR CREEK

00.5 MI SW FOREST GROVE, Washington, OR

Built 2020 Load: 32.4 t ADT: 7,839

TIMBER ROAD

Good

Over: LOUSIGNONT CREEK

005 MI SOUTH OF HWY 26, Washington, OR

Built 1984 Load: 33.4 t ADT: 472

WEST UNION ROAD

Good

Over: MCKAY CREEK

002 MI E SHADYBROOK ROAD, Washington, OR

Built 1981 Load: 33.6 t ADT: 2,394

JENKINS ROAD

Good

Over: CEDAR MILL CREEK

05 MI WEST MURRAY BLVD, Washington, OR

Built 2020 Load: 34.3 t ADT: 21,818

MOUNTAINDALE ROAD

Good

Over: BLEDSOE CREEK

009 MI N HWY 26, Washington, OR

Built 1992 Load: 34.3 t ADT: 530

VANDERSCHURE ROAD

Good

Over: SMALL STREAM

002 MI W MIDWAY ROAD, Washington, OR

Built 2023 Load: 34.7 t ADT: 768

OLD TV HWY #47

Good

Over: SCOGGINS CREEK

015 MI N PATTON VALLEY RD, Washington, OR

Built 2013 Load: 35.0 t ADT: 472

OLESON ROAD

Good

Over: FANNO CREEK

005 MI S HWY 10, Washington, OR

Built 2015 Load: 35.3 t ADT: 12,127

SW 130 Avenue

Good

Over: Summer Creek

0.3 mi S of Scholls Fy Rd, Washington, OR

Built 1996 Load: 35.6 t ADT: 636

GLENCOE ROAD

Good

Over: MCKAY CREEK

005 N EVERGREEN ROAD, Washington, OR

Built 2011 Load: 35.6 t ADT: 7,882

DURHAM ROAD

Good

Over: FANNO CREEK

15 MI W BOONES FERRY RD., Washington, OR

Built 1996 Load: 36.3 t ADT: 21,752

FERN HILL ROAD

Good

Over: TUALATIN RIVER

002 SOUTH HWY 47, Washington, OR

Built 1984 Load: 36.3 t ADT: 1,413

BROOKWOOD AVE

Good

Over: ROCK CREEK

010 N TV HWY., Washington, OR

Built 1988 Load: 36.3 t ADT: 13,577

CORNELIUS SCHEFLIN

Good

Over: Council Creek

006 MI N HWY 8, Washington, OR

Built 2007 Load: 36.9 t ADT: 5,234

PONGRATZ ROAD

Good

Over: WHITCHER CREEK

005 MI N CASON ROAD, Washington, OR

Built 2021 Load: 37.6 t ADT: 243

LABROUSSE ROAD

Good

Over: CEDAR CREEK

CO.RD.# 2080, Washington, OR

Built 1971 Load: 38.1 t ADT: 152

PARSONS ROAD

Good

Over: GALES CREEK

002 MI N GALES CREEK HWY, Washington, OR

Built 1981 Load: 38.1 t ADT: 375

OR 47 (Hwy 102)

Good

Over: Creek

1.6 M S OF VERBOORT RD, Washington, OR

Built 2000 Load: 38.9 t ADT: 13,175

GLENCOE RD CO

Good

Over: HWY 47 US 26

17.3 MI W OF PORTLAND CC, Washington, OR

Built 2013 Load: 38.9 t ADT: 10,827

HART ROAD

Good

Over: JOHNSON CREEK

0.39 MI W OF MURRAY BLVD, Washington, OR

Built 2003 Load: 39.0 t ADT: 6,549

SW Washington St.

Good

Over: Cedar Creek

Wash. ST AND Cedar CR, Washington, OR

Built 2008 Load: 39.2 t ADT: 214

Hwy 029

Good

Over: P&WRR

052 MI E HILLSBORO CC, Washington, OR

Built 1983 Load: 39.5 t ADT: 36,092

SW BARROWS ROAD

Good

Over: CREEK

West Barrows Rd culvert, Washington, OR

Built 2004 Load: 39.5 t ADT: 3,275

SW BARROWS ROAD

Good

Over: CREEK

East Barrows Rd culvert, Washington, OR

Built 2004 Load: 39.5 t ADT: 3,275

SW MENLOR LANE

Good

Over: CREEK

Menlor Lane Culvert, Washington, OR

Built 2004 Load: 39.5 t ADT: 3,275

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.