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

All bridges (326)

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

NW Joss Ave.

Good

Over: Unnamed Channel

MP 0.01, Washington, OR

Built 2007 Load: 39.5 t ADT: 100

SW OBERST ROAD

Good

Over: CEDAR CREEK

002 MI S BROOKMAN RD, Washington, OR

Built 1971 Load: 39.9 t ADT: 218

N.W. 185TH AVE

Good

Over: ROCK CREEK

004 M I S SPRINGVILLE RD, Washington, OR

Built 1982 Load: 39.9 t ADT: 4,587

COLLINS ROAD

Good

Over: BRUNSWICK CREEK

024 MI NW SHADYBROOK, Washington, OR

Built 1997 Load: 39.9 t ADT: 231

TIMBER ROAD

Good

Over: NEHALEM RIVER

TOWN OF TIMBER, Washington, OR

Built 2006 Load: 40.2 t ADT: 639

Farmington Road

Good

Over: TUALATIN RIVER

8.0 MI SW BEAVERTON CC, Washington, OR

Built 2005 Load: 40.8 t ADT: 13,354

HWY 144AW

Good

Over: HWY 144

2.8 MI NW TIGARD CC, Washington, OR

Built 1978 Load: 40.8 t ADT: 2,687

HWY 144AY

Good

Over: HWY 144

2.8 MI NW TIGARD CC, Washington, OR

Built 1978 Load: 40.8 t ADT: 2,687

JACKSON QUARRY RD

Good

Over: JACKSON CREEK

023 MI W HWY 26, Washington, OR

Built 1991 Load: 41.1 t ADT: 1,041

PORTER RD

Good

Over: COUNCIL CREEK

007 MI N HWY # 8, Washington, OR

Built 2017 Load: 41.5 t ADT: 417

SW 65TH AVE

Good

Over: NYBERG CREEK

013 MI EAST I5, Washington, OR

Built 1980 Load: 41.7 t ADT: 18,383

MT RICHMOND RD

Good

Over: UNNAMED CREEK

0042 MI S PATTON VALLEY, Washington, OR

Built 2020 Load: 41.8 t ADT: 305

WEST SHORE DRIVE

Good

Over: SCOGGINS DAM SPILLWAY BR

TUALATIN OR, Washington, OR

Built 1972 Load: 42.0 t ADT: 400

Park Road

Good

Over: West Fork Dairy Ck

Stub Stewart, Washington, OR

Built 2004 Load: 42.1 t ADT: 75

NW GALES CREEK RD

Good

Over: GALES CREEK

0085 MI S CLAPSHAW HILL, Washington, OR

Built 2017 Load: 42.1 t ADT: 2,239

GEIGER RD

Good

Over: TUALATIN RIVER OVERFLOW

003 MI E FERN MILL RD, Washington, OR

Built 1964 Load: 42.1 t ADT: 282

N.W. 185TH AVE

Good

Over: ROCK CREEK

006 MI N SPRINGVILLE RD, Washington, OR

Built 1982 Load: 42.6 t ADT: 4,587

Bethany Blvd.

Good

Over: Hwy 47 (US 26)

8.8 MI W OF PORTLAND CC, Washington, OR

Built 1991 Load: 43.1 t ADT: 117,563

CEDAR CANYON ROAD

Good

Over: DAIRY CREEK OVERFLOW

005 MI W HWY 47, Washington, OR

Built 1997 Load: 44.5 t ADT: 1,895

ROY ROGERS RD.

Good

Over: TUALATIN RV TRIBUTARY

N OF TUALATIN RIVER, Washington, OR

Built 2000 Load: 44.5 t ADT: 12,050

PIHL ROAD

Good

Over: DAIRY CREEK

0016 MI N HWY 26, Washington, OR

Built 1984 Load: 44.5 t ADT: 694

Hwy 029

Good

Over: Dawson Creek

1.5 MI E HILLSBORO CC, Washington, OR

Built 1961 Load: 45.0 t ADT: 22,459

SCHOLLS FERRY RD

Good

Over: TUALATIN RIVER

01.2 MI NE HWY 140 JCT, Washington, OR

Built 2008 Load: 45.4 t ADT: 8,144

MIDWAY ROAD

Good

Over: MCFEE CREEK

025 MI S HWY 219, Washington, OR

Built 1981 Load: 45.4 t ADT: 1,463

GREENBURG ROAD

Good

Over: ASH CREEK

001 MI SOUTH HWY 217, Washington, OR

Built 1989 Load: 46.0 t ADT: 24,002

SW VERMONT ST

Good

Over: FANNO CREEK

.2 MI E OF SCHOLLS FRY RD, Washington, OR

Built 2005 Load: 46.3 t ADT: 13

TIMBER ROAD

Good

Over: GALES CREEK

001 MI N HWY 6, Washington, OR

Built 2017 Load: 46.3 t ADT: 699

SCOTCH CHURCH RD

Good

Over: MCKAY CREEK

005 MI E GLENCOE ROAD, Washington, OR

Built 2020 Load: 46.7 t ADT: 3,210

OR 47 (Hwy 102)

Good

Over: Beaver Creek

7.0 MI S VERNONIA, Washington, OR

Built 2018 Load: 47.3 t ADT: 3,156

MT RICHMOND RD

Good

Over: TUALATIN RIVER OFLOW

0003 MI S PATTON VALLEY, Washington, OR

Built 2020 Load: 47.3 t ADT: 305

GERMANTOWN ROAD

Good

Over: ROCK CREEK

006 MI W COUNTY LINE, Washington, OR

Built 2000 Load: 48.1 t ADT: 2,833

ROOD BRIDGE RD

Good

Over: TUALATIN RIVER

030 MI N FARMINGTON ROAD, Washington, OR

Built 2004 Load: 48.1 t ADT: 6,556

GREEN MOUNTAIN RD

Good

Over: W.FK.DAIRY CREEK

001 MI N SELL ROAD, Washington, OR

Built 1978 Load: 48.1 t ADT: 450

DAVIS RD

Good

Over: JOHNSON CREEK

.2MI WEST OFF MURREY BLVD, Washington, OR

Built 1997 Load: 48.1 t ADT: 330

CORNELL ROAD

Good

Over: ROCK CREEK OVERFLOW

W of John Olsen Ave, Washington, OR

Built 2001 Load: 48.3 t ADT: 24,439

US 26 (Hwy 047) WB

Good

Over: McKay Creek

16.6 MI W OF PORTLAND CC, Washington, OR

Built 2010 Load: 48.3 t ADT: 18,378

Park Entrance Road

Good

Over: W Fork Dairy Ck (Trib)

STUB STEWART, Washington, OR

Built 2004 Load: 49.9 t ADT: 75

GASTON ROAD

Good

Over: WAPATO CREEK

0075 MI E GASTON, Washington, OR

Built 2021 Load: 49.9 t ADT: 2,057

CEM.ACC.RD-CAMELOT

Good

Over: Hwy 47 US 26

3.8 MI W OF PORTLAND CC, Washington, OR

Built 1999 Load: 50.5 t ADT: 326

Cabot St

Good

Over: Tri-Met LRT

OR 217 at MP 1.18, Washington, OR

Built 1994 Load: 50.9 t ADT: 88,423

GRANT AVENUE

Good

Over: FANNO CREEK

0010 SOUTH TIGARD ST, Washington, OR

Built 1998 Load: 52.2 t ADT: 4,248

TIEDEMAN AVE

Good

Over: FANNO CREEK

003 MI SOUTH TIGARD ST, Washington, OR

Built 1998 Load: 53.5 t ADT: 7,083

MURTAUGH ROAD

Good

Over: MURTAUGH CREEK

0020 M I W MEACHAM, Washington, OR

Built 2003 Load: 53.5 t ADT: 177

SUSBAUER ROAD

Good

Over: DAIRY CREEK

004 N LONG ROAD, Washington, OR

Built 1981 Load: 53.5 t ADT: 6,184

OLD CORNELIUS PASS

Good

Over: ROCK CREEK

0135 MI N GERMANTOWN RD, Washington, OR

Built 2012 Load: 53.8 t ADT: 850

NE 69TH AVE

Good

Over: ROCK CREEK

005 MI W 216TH AVE, Washington, OR

Built 2020 Load: 53.8 t ADT: 563

HALL BLVD

Good

Over: FANNO CREEK

002 E OF GREENWAY BLVD, Washington, OR

Built 1981 Load: 54.8 t ADT: 35,412

US 26 (Hwy 047)

Good

Over: Rock Creek

11.1 MI W OF PORTLAND CC, Washington, OR

Built 2017 Load: 56.4 t ADT: 100,225

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.