US Bridges

Or 229 (hwy 181) over Siletz River

Fair

Lincoln County, Oregon · In Siletz · Structure no. 00853A181 02410

Built
1956
69 years old
Condition
Fair
inspected June 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
314 ft
1 main span
Daily traffic
3,467
2022 count
Owner
State
State Highway Agency

About this bridge

Or 229 (hwy 181) over Siletz River is a prestressed concrete box beam or girders - multiple carrying Or 229 (hwy 181) over Siletz River in Lincoln County, Oregon. It was built in 1956, so it is 69 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.

It carries about 3,467 vehicles a day, roughly 12% of them trucks, projected to reach 3,800 by 2042. The structure is 314 ft (95.6 m) long and 31 ft wide. If it were closed, the detour would be 18.6 mi (30 km).

Location

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CarriesOr 229 (hwy 181)
CrossesSiletz River
LocationIn Siletz
RouteState Highway 229
CountyLincoln County
StateOregon
Coordinates44.71881, -123.91803
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31.1 US tons
Inventory rating23.9 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1 (+4 approach)
Design loadHS 20
Structure length314 ft (95.6 m)
Longest span153 ft (46.5 m)
Deck width31 ft (9.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,467 (2022)
Projected traffic3,800 by 2042
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18.6 mi (30 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$1.6 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Or 229 (hwy 181) over Siletz River built?

It was built in 1956, making it 69 years old in 2025.

What condition is Or 229 (hwy 181) over Siletz River 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 June 2023.

How much traffic does Or 229 (hwy 181) over Siletz River carry?

About 3,467 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is Or 229 (hwy 181) over Siletz River?

The structure is 314 ft (95.6 m) long with a longest span of 153 ft (46.5 m) and a deck 31 ft wide.

Who owns Or 229 (hwy 181) over Siletz River?

It is owned by the State Highway Agency.