Total bridges
373
Public highway bridges in Marion County
County profile · official public datasets
Marion County, OR
373 public highway bridges tracked in the FHWA National Bridge Inventory: 21.2% rated Good, 74.5% Fair, 4.3% Poor.
- 373
- Public bridges
- 21.2%
- Good condition
- 4.3%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Marion County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- 22nd
- of 36 on Poor share
- 4.3%
- Poor-condition share
- 373
- public highway bridges
- 1971
- 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.
Marion County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Marion County ranks #22 of 36 Oregon counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.3%). Marion County, Oregon contains 373 public highway bridges. Roughly 21.2% are rated “Good,” 74.5% “Fair,” and 4.3% “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
21.2%
79 of 373 rated 7-9
Fair condition
74.5%
278 of 373 rated 5-6
Poor condition
4.3%
16 of 373 rated 4 or below
In-state Poor-share rank
#22 of 36
Among Oregon counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 373 NBI-tracked bridges by lowest applicable component rating.
Good 21.2% (79)
Fair 74.5% (278)
Poor 4.3% (16)
Marion County's Poor-condition bridges carry 52,460 vehicle crossings a day
That is 1.3% of the county's reported daily bridge traffic on 4.3% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 3,279 crossings a day against 8,093 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 373 of 373 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
61.7% of Marion County's bridges have passed the 50-year mark
230 of the 373 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 21.2% 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 21.7% of the county's Poor-condition bridge traffic
SCOTTS MILLS RD over BUTTE CREEK, built 1947, carries 11,400 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 16-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 52,460 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Marion County's bridges were built
373 bridges with a recorded construction year, grouped by decade
- 1910s 4
1910–1919
4 bridges
- 1920s 20
1920–1929
20 bridges
- 1930s 14
1930–1939
14 bridges
- 1940s 7
1940–1949
7 bridges
- 1950s
1950–1959
68 bridges
- 1960s
1960–1969
84 bridges
- 1970s
1970–1979
56 bridges
- 1980s 27
1980–1989
27 bridges
- 1990s 32
1990–1999
32 bridges
- 2000s
2000–2009
44 bridges
- 2010s 15
2010–2019
15 bridges
- 2020s 2
2020–2029
2 bridges
What this shows Construction peaked in the 1960s, when 84 of the county's bridges still in the inventory were built, which is 22.5% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1971) matches the Oregon average (1975).
How Marion County compares with Oregon's closest counties by inventory size
The 5 Oregon counties nearest Marion County in number of bridges, with their condition splits. Its 4.3% Poor share is the 6th-lowest of these 6. Its average build year of 1971 against a peer-group mean of 1975 is in line with the group.
Showing the 5 closest of 35 Oregon counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Multnomah County | 473 | 11.8% | 85.2% | 3% | 1967 |
| Jackson County | 401 | 34.2% | 64.3% | 1.5% | 1976 |
| Marion County (this page) | 373 | 21.2% | 74.5% | 4.3% | 1971 |
| Clackamas County | 367 | 31.1% | 66.5% | 2.5% | 1975 |
| Washington County | 326 | 35.6% | 62% | 2.5% | 1983 |
| Umatilla County | 321 | 31.5% | 64.5% | 4% | 1973 |
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 Marion 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 Marion County, both outside Oregon so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside OR (373 bridges here).
- Solano County, CA · 373 bridges
- Hunterdon County, NJ · 373 bridges
- Benton County, IA · 374 bridges
- Baltimore city County, MD · 374 bridges
Similar average build year
Nearest mean year-built outside OR (1971 here).
- Wayne County, MI · avg 1971 · 1,026 bridges
- Baltimore County, MD · avg 1971 · 783 bridges
- Washington County, PA · avg 1971 · 655 bridges
- Monmouth County, NJ · avg 1971 · 505 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Poor-condition bridges (16)
SCOTTS MILLS RD
PoorOver: BUTTE CREEK
IN SCOTTS MILLS, Marion, OR
Built 1947 Load: 8.1 t ADT: 11,400
ST. PAUL HWY
PoorOver: CASE CREEK
01.2 MI.OF BUTTEVILLE RD., Marion, OR
Built 1966 Load: 11.0 t ADT: 1,454
BRUSH CR RD
PoorOver: SILVER CREEK
008 MI N HWY 213, Marion, OR
Built 1955 Load: 12.3 t ADT: 2,506
MONITOR-MCKEE RD
PoorOver: PUDDING RIVER
043 MI S-E I-5 HWY214 JCT, Marion, OR
Built 1950 Load: 14.3 t ADT: 2,663
SORBIN AVE
PoorOver: NORTH SANTIAM RIVER
SOUTH EDGE GATES, Marion, OR
Built 1994 Load: 14.9 t ADT: 1,438
OR 213 (HWY 160)
PoorOver: Abiqua Creek
027 MI S MARION CO LN, Marion, OR
Built 1934 Load: 16.2 t ADT: 5,158
MILL CR RD
PoorOver: MILL CREEK
01.0 EAST OF MARION RD, Marion, OR
Built 1930 Load: 19.1 t ADT: 4,699
ROSEBUD LN
PoorOver: SIDNEY DITCH
006 MI S E MARION, Marion, OR
Built 1969 Load: 19.1 t ADT: 139
HWY 140 (OR 219)
PoorOver: West Champoeg Creek
030 MI N WOODBURN, Marion, OR
Built 1958 Load: 20.4 t ADT: 1,860
BUENA VISTA RD
PoorOver: SIDNEY DITCH
04.0 NE OF FERRY, Marion, OR
Built 1958 Load: 22.2 t ADT: 783
N. SECOND AVE
PoorOver: SALEM DITCH
01 N OF IDA STREET, Marion, OR
Built 1965 Load: 22.9 t ADT: 2,866
ROAD
PoorOver: BLOWOUT CR
11.1 M S JCT HWY 22-FS 10, Marion, OR
Built 1954 Load: 24.2 t ADT: 75
MERIDIAN RD
PoorOver: ABIQUA CREEK
02.0 NE OF SILVERTON, Marion, OR
Built 1954 Load: 25.6 t ADT: 2,635
HWY 140 (OR 219)
PoorOver: Willamette River Oflow
00.2 MI S YAM MARION CO L, Marion, OR
Built 1958 Load: 29.8 t ADT: 4,094
ROAD
PoorOver: DEVILS CR
NO DATA ENTERED, Marion, OR
Built 1967 Load: 30.1 t ADT: 50
WILCO ROAD
PoorOver: SALEM DITCH
00.4 SOUTH OF SHAFF ROAD, Marion, OR
Built 1968 Load: 32.1 t ADT: 10,640
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.