Total bridges
326
Public highway bridges in Washington County
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.
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
- 1920s 5
1920–1929
5 bridges
- 1930s 6
1930–1939
6 bridges
- 1940s 10
1940–1949
10 bridges
- 1950s 24
1950–1959
24 bridges
- 1960s
1960–1969
41 bridges
- 1970s
1970–1979
68 bridges
- 1980s
1980–1989
38 bridges
- 1990s
1990–1999
37 bridges
- 2000s
2000–2009
57 bridges
- 2010s 25
2010–2019
25 bridges
- 2020s 15
2020–2029
15 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.
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.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Jackson County | 401 | 34.2% | 64.3% | 1.5% | 1976 |
| Marion County | 373 | 21.2% | 74.5% | 4.3% | 1971 |
| Clackamas County | 367 | 31.1% | 66.5% | 2.5% | 1975 |
| Washington County (this page) | 326 | 35.6% | 62% | 2.5% | 1983 |
| Umatilla County | 321 | 31.5% | 64.5% | 4% | 1973 |
| Coos County | 254 | 40.9% | 55.9% | 3.1% | 1978 |
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).
- Miami County, KS · 326 bridges
- Montgomery County, KS · 326 bridges
- Merrimack County, NH · 326 bridges
- St. Clair County, MI · 327 bridges
Similar average build year
Nearest mean year-built outside OR (1983 here).
- Dallas County, TX · avg 1983 · 3,230 bridges
- Bexar County, TX · avg 1983 · 2,342 bridges
- Sedgwick County, KS · avg 1983 · 1,333 bridges
- Will County, IL · avg 1983 · 649 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (202)
HOBBS RD
FairOver: COUNCIL CREEK
004 EAST SUSBAUER RD, Washington, OR
Built 1955 Load: 20.4 t ADT: 336
OLD TV HWY #47
FairOver: TUALATIN RIVER OVERFLOW
0025 MI W TUALATIN RIVER, Washington, OR
Built 1934 Load: 20.4 t ADT: 576
Jackson School Rd
FairOver: US 26 (HWY 047)
15.75 MI W Portland CC, Washington, OR
Built 2006 Load: 20.7 t ADT: 8,781
JARREL ROAD
FairOver: JACKSON CREEK
005 MI E MASON HILL RD, Washington, OR
Built 1976 Load: 20.7 t ADT: 106
US 26 (HWY 047) EB
FairOver: Mckay Creek
16.6 MI W of Portland CC, Washington, OR
Built 1968 Load: 21.1 t ADT: 18,378
MINTER BRIDGE ROAD
FairOver: DAVIS CREEK
002 MI N BURKHALTER, Washington, OR
Built 1959 Load: 21.1 t ADT: 382
REILING RD
FairOver: SMALL STREAM
009 MI E HWY 47, Washington, OR
Built 1960 Load: 21.1 t ADT: 77
ROY ROAD
FairOver: E FK DAIRY CR OFLOW
023 MI E HWY 47, Washington, OR
Built 1960 Load: 21.1 t ADT: 1,275
FISHER ROAD
FairOver: WEST FORK DAIRY CREEK
007 MI S SUNSET HWY, Washington, OR
Built 1977 Load: 21.1 t ADT: 224
OR 6 (Hwy 037)
FairOver: Gales Creek
14.0 MI W HWY 47 JCT, Washington, OR
Built 1956 Load: 21.4 t ADT: 5,608
SW 185TH AVE
FairOver: BEAVERTON CREEK
0061 MI S BASELINE RD, Washington, OR
Built 1987 Load: 21.4 t ADT: 28,780
MILLIKAN WAY
FairOver: BEAVERTON CREEK
002 N TUALATIN VALLEY HWY, Washington, OR
Built 1984 Load: 21.4 t ADT: 7,083
OR 99W(HWY 91)NB
FairOver: TUALATIN RIVER
0.5 MI S OF KING CITY CC, Washington, OR
Built 1955 Load: 21.7 t ADT: 13,883
OR 47 (Hwy 102)
FairOver: Cummings Creek
2.0 MI N HWY 47 JCT, Washington, OR
Built 1954 Load: 21.7 t ADT: 3,666
OR 6 (Hwy 037)
FairOver: Dairy Creek Oflow
3.3 MI W OF HWY 47 JCT, Washington, OR
Built 1954 Load: 22.0 t ADT: 8,032
Hwy 29
FairOver: Gales Creek Oflow No. 1
15.5 MI FROM OSHD SCALE, Washington, OR
Built 1975 Load: 22.0 t ADT: 11,189
SODA SPRINGS RD
FairOver: CLEAR CREEK
0022 MI N CLEAR CREEK RD, Washington, OR
Built 1979 Load: 22.0 t ADT: 141
Hwy 29
FairOver: Tualatin River
0.2 MI N GASTON PO, Washington, OR
Built 1967 Load: 22.4 t ADT: 9,917
DERSHAM RD
FairOver: HWY 47 US 26
19.3 MI W OF PORTLAND CC, Washington, OR
Built 1971 Load: 22.7 t ADT: 8,000
US 26 (HWY 047)
FairOver: HWY 144
5.3 MI W OF PORTLAND CC, Washington, OR
Built 1986 Load: 22.7 t ADT: 115,947
Walker Road
FairOver: HWY 144
0.6 MI N OF HWY 29, Washington, OR
Built 1972 Load: 22.7 t ADT: 18,133
TUALATIN-SHERWOOD
FairOver: ROCK CREEK
MP 0.7, Washington, OR
Built 1990 Load: 23.0 t ADT: 15,717
MCCORMACK HILL RD
FairOver: MCFEE CREEK
017 MI NORTH COUNTY LINE, Washington, OR
Built 1991 Load: 23.0 t ADT: 77
ROY ROAD
FairOver: EAST FORK DAIRY CREEK
024 MI E HWY 47, Washington, OR
Built 1960 Load: 23.0 t ADT: 1,238
HWY 141
FairOver: I-5 (HWY 001)
4.0 MI S OF TUALATIN R, Washington, OR
Built 1970 Load: 23.3 t ADT: 29,837
I-5 (HWY 001) CON
FairOver: BEAVER DAM CREEK
0.4 MI S OF TUALATIN R., Washington, OR
Built 1991 Load: 23.3 t ADT: 9,889
VANDERSCHUERE ROAD
FairOver: MCFEE CREEK
007 MI W MIDWAY ROAD, Washington, OR
Built 1975 Load: 23.3 t ADT: 1,367
US 26 (HWY 047)
FairOver: Wolf Creek
16.1 MI W HWY 37 JCT, Washington, OR
Built 1938 Load: 24.0 t ADT: 6,936
HWY 140
FairOver: JACKSON BOTTOM SLOUGH
0.9 MI N OF HWY 29, Washington, OR
Built 1966 Load: 24.0 t ADT: 8,147
US 26 (HWY 047) EB
FairOver: CEDAR HILLS BLVD
6.2 MI W OF PORTLAND CC, Washington, OR
Built 1966 Load: 24.0 t ADT: 130,741
CONN 2 (PARKWAY)CO
FairOver: HWY 144
SUNSET INTERCHANGE, Washington, OR
Built 1971 Load: 24.3 t ADT: 1,000
OR 210 (HWY 143)
FairOver: HWY 144
1.5 MI SW BEAVERTON CC, Washington, OR
Built 1968 Load: 24.3 t ADT: 18,050
HWY 141
FairOver: FANNO CREEK
2.9 MI S OF HWY 143, Washington, OR
Built 1965 Load: 24.6 t ADT: 11,275
I-5 (HWY 001) NB
FairOver: BEAVER DAM CREEK
0.5 MI S OF TUALATIN R., Washington, OR
Built 1975 Load: 24.6 t ADT: 69,744
GORDON RD
FairOver: HWY 47 US 26
North Plains CL, Washington, OR
Built 1970 Load: 24.6 t ADT: 6,868
HWY 1W NB TO 1 NB
FairOver: I-5 (HWY 001)
1.3 MI N OF TIGARD CC, Washington, OR
Built 1985 Load: 24.9 t ADT: 7,902
OR 6 (Hwy 037)
FairOver: West Fork Dairy Creek
3.6 MI W OF HWY 47 JCT, Washington, OR
Built 1954 Load: 25.3 t ADT: 8,032
OLD TV HWY #47
FairOver: TUALATIN RIVER
002 W NEW HWY # 47, Washington, OR
Built 1921 Load: 25.3 t ADT: 576
OR 6 (Hwy 037)
FairOver: Dairy Creek Overflow
3.0 MI W OF HWY 47 JCT, Washington, OR
Built 1954 Load: 25.4 t ADT: 8,032
HWY 140
FairOver: BURRIS CREEK
113 MI N NEWBERG, Washington, OR
Built 1960 Load: 25.9 t ADT: 4,802
153RD AVE
FairOver: BEAVERTON CREEK
001 MI N TV HWY, Washington, OR
Built 1985 Load: 25.9 t ADT: 2,833
HWY 140
FairOver: TUALATIN RIVER
001 MI S HILLSBORO, Washington, OR
Built 1924 Load: 26.3 t ADT: 8,147
OR 6 (Hwy 037)
FairOver: Gales Creek
9.3 MI W HWY 47 JCT, Washington, OR
Built 1956 Load: 26.3 t ADT: 5,349
CORNELIUS/SCHEFLIN
FairOver: DAIRY CREEK
002 MI N VERBOORT ROAD, Washington, OR
Built 1972 Load: 26.3 t ADT: 13,697
OLD TV HWY #47
FairOver: SCOGGINS CR OFLOW
001 S SCOGGINS VALLEY RD, Washington, OR
Built 1924 Load: 26.3 t ADT: 536
SW 192ND AVENUE
FairOver: BUTTERNUT CREEK
003 MI N ROSA ROAD, Washington, OR
Built 1974 Load: 27.2 t ADT: 1,274
JACKSON SCHOOL RD
FairOver: WAIBLE CREEK
0015 S MEEK ROAD, Washington, OR
Built 1972 Load: 27.2 t ADT: 10,382
OR 47 (Hwy 102)
FairOver: Beaver Creek
7.0 MI S VERNONIA, Washington, OR
Built 1932 Load: 27.5 t ADT: 3,156
I-5 (HWY 001)
FairOver: LOWER BOONESFERRY
0.6 MI N OF TUALATIN RV, Washington, OR
Built 1975 Load: 27.5 t ADT: 137,001
B Street
FairOver: GALES CR
0.02 MI SW FOREST GROVE, Washington, OR
Built 1949 Load: 27.9 t ADT: 7,839
Read our methodology - how this data is sourced, computed, and verified.
Related
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.