Total bridges
148
Public highway bridges in Wasco County
County profile · official public datasets
Wasco County, OR
148 public highway bridges tracked in the FHWA National Bridge Inventory: 31.8% rated Good, 60.1% Fair, 8.1% Poor.
- 148
- Public bridges
- 31.8%
- Good condition
- 8.1%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Wasco County pairs a higher-than-median Poor-condition share among rated counties in the state with an older average build year than the state inventory.
- 33rd
- of 36 on Poor share
- 8.1%
- Poor-condition share
- 148
- public highway bridges
- 1968
- 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.
Wasco County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Wasco County ranks #33 of 36 Oregon counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 8.1%). Wasco County, Oregon contains 148 public highway bridges. Roughly 31.8% are rated “Good,” 60.1% “Fair,” and 8.1% “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
31.8%
47 of 148 rated 7-9
Fair condition
60.1%
89 of 148 rated 5-6
Poor condition
8.1%
12 of 148 rated 4 or below
In-state Poor-share rank
#33 of 36
Among Oregon counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 148 NBI-tracked bridges by lowest applicable component rating.
Good 31.8% (47)
Fair 60.1% (89)
Poor 8.1% (12)
Wasco County's Poor-condition bridges carry 1,941 vehicle crossings a day
That is 0.4% of the county's reported daily bridge traffic on 7.5% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 176 crossings a day against 4,192 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 147 of 148 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
62.2% of Wasco County's bridges have passed the 50-year mark
92 of the 148 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 31.8% 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 32.2% of the county's Poor-condition bridge traffic
MILL CR RD over MILL CREEK, built 1941, carries 625 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 12-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 1,941 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Wasco County's bridges were built
148 bridges with a recorded construction year, grouped by decade
- 1910s 2
1910–1919
2 bridges
- 1920s 10
1920–1929
10 bridges
- 1930s 1
1930–1939
1 bridges
- 1940s 11
1940–1949
11 bridges
- 1950s
1950–1959
29 bridges
- 1960s
1960–1969
32 bridges
- 1970s
1970–1979
24 bridges
- 1980s 10
1980–1989
10 bridges
- 1990s 12
1990–1999
12 bridges
- 2000s 10
2000–2009
10 bridges
- 2010s 4
2010–2019
4 bridges
- 2020s 3
2020–2029
3 bridges
What this shows Construction peaked in the 1960s, when 32 of the county's bridges still in the inventory were built, which is 21.6% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year is 1968, 7 years older than the Oregon average of 1975.
How Wasco County compares with Oregon's closest counties by inventory size
The 5 Oregon counties nearest Wasco County in number of bridges, with their condition splits. Its 8.1% Poor share is the 6th-lowest of these 6. Its average build year of 1968 against a peer-group mean of 1978 is 10 years older.
Showing the 5 closest of 35 Oregon counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Polk County | 161 | 29.2% | 64% | 6.8% | 1976 |
| Clatsop County | 155 | 32.9% | 63.2% | 3.9% | 1974 |
| Deschutes County | 152 | 56.6% | 42.1% | 1.3% | 1986 |
| Yamhill County | 149 | 24.2% | 71.1% | 4.7% | 1975 |
| Wasco County (this page) | 148 | 31.8% | 60.1% | 8.1% | 1968 |
| Grant County | 144 | 45.1% | 49.3% | 5.6% | 1980 |
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 Wasco 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 Wasco County, both outside Oregon so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside OR (148 bridges here).
- Claiborne County, LA · 148 bridges
- Ravalli County, MT · 148 bridges
- Nance County, NE · 148 bridges
- Cayuga County, NY · 148 bridges
Similar average build year
Nearest mean year-built outside OR (1968 here).
- Montgomery County, PA · avg 1968 · 828 bridges
- San Joaquin County, CA · avg 1968 · 644 bridges
- Providence County, RI · avg 1968 · 476 bridges
- Imperial County, CA · avg 1968 · 444 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Poor-condition bridges (12)
ROAD
PoorOver: WHITE RIVER
S-31 T-4S R-10E WM, Wasco, OR
Built 1958 ADT: 50
IRR BIA RTE 6001
PoorOver: MILL CREEK
6.5 KM W OF OLD MILL CAMP, Wasco, OR
Built 1988 Load: 0.0 t ADT: 10
IRR BIA RTE 34
PoorOver: WARM SPRINGS RIVER
42 KM NW OF WARM SPRINGS, Wasco, OR
Built 1981 Load: 0.0 t
IRR BIA RTE 2
PoorOver: BADGER CREEK
30 KM NW OF WARM SPRINGS, Wasco, OR
Built 1999 Load: 10.8 t ADT: 10
MILL CR RD
PoorOver: MILL CREEK
3.7 MI. S ON MILL CRK RD., Wasco, OR
Built 1941 Load: 11.0 t ADT: 625
EMERSON ROBERTS RD
PoorOver: FIFTEENMILE CREEK
AT EMERSON, Wasco, OR
Built 1958 Load: 11.0 t ADT: 30
STEELE ROAD
PoorOver: THREEMILE CREEK
0.5 MI E OF THREEMILE RD, Wasco, OR
Built 1950 Load: 11.3 t ADT: 598
MOSIER CREEK ROAD
PoorOver: MOSIER CREEK
0.3 MI S OF WILSON RD, Wasco, OR
Built 1950 Load: 13.9 t ADT: 244
MOSIER CREEK ROAD
PoorOver: MOSIER CREEK
2.0 MI S OF WILSON RD, Wasco, OR
Built 1950 Load: 19.8 t ADT: 229
COMPANY HOLLOW RD
PoorOver: FIFTEENMILE CREEK
FAIRBANKS, Wasco, OR
Built 1955 Load: 21.1 t ADT: 45
ROAD
PoorOver: CEDAR CREEK (CLIP CRK?)
S-34 T-4S R-10E WM, Wasco, OR
Built 1991 Load: 58.1 t ADT: 50
ROAD
PoorOver: BOULDER CREEK (CRANE)
S-35 T-4S R-10E WM, Wasco, OR
Built 1985 Load: 61.7 t ADT: 50
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.