US Bridges

Irish Bend RD over Willamette River Oflow

FairPosted for load

Benton County, Oregon · 0.95 MI E of Old River RD · Structure no. 14166A000 00090

Built
1963
62 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
78 ft
3 main spans
Daily traffic
78
2021 count
Owner
County
County Highway Agency

About this bridge

Irish Bend RD over Willamette River Oflow is a wood or timber stringer/multi-beam or girder carrying Irish Bend RD over Willamette River Oflow in Benton County, Oregon. It was built in 1963, so it is 62 years old, older than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 78 vehicles a day, projected to reach 159 by 2041. The structure is 78 ft (23.8 m) long and 25 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesIrish Bend RD
CrossesWillamette River Oflow
Location0.95 MI E of Old River RD
RouteCounty Highway 0
CountyBenton County
StateOregon
Coordinates44.36786, -123.24152
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating12.1 US tons
Inventory rating9.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadH 20
Structure length78 ft (23.8 m)
Longest span27 ft (8.2 m)
Deck width25 ft (7.6 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic78 (2021)
Projected traffic159 by 2041
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Irish Bend RD over Willamette River Oflow built?

It was built in 1963, making it 62 years old in 2025.

What condition is Irish Bend RD over Willamette River Oflow in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in July 2024.

How much traffic does Irish Bend RD over Willamette River Oflow carry?

About 78 vehicles per day (2021 count).

How long is Irish Bend RD over Willamette River Oflow?

The structure is 78 ft (23.8 m) long with a longest span of 27 ft (8.2 m) and a deck 25 ft wide.

Who owns Irish Bend RD over Willamette River Oflow?

It is owned by the County Highway Agency.