US Bridges

Or 34 (hwy 27) over Alsea River

FairPosted for load

Lincoln County, Oregon · 071 MI E HWY 9 JCT · Structure no. 02652 027 00706

Built
1940
85 years old
Condition
Fair
inspected October 2023
Type
Girder and Floorbeam System
Steel Continuous
Length
375 ft
3 main spans
Daily traffic
1,476
2022 count
Owner
State
State Highway Agency

About this bridge

Or 34 (hwy 27) over Alsea River is a steel continuous girder and floorbeam system carrying Or 34 (hwy 27) over Alsea River in Lincoln County, Oregon. It was built in 1940, so it is 85 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 other load-capacity restriction.

It carries about 1,476 vehicles a day, roughly 16% of them trucks, projected to reach 1,600 by 2042. The structure is 375 ft (114.3 m) long and 39 ft wide. If it were closed, the detour would be 49.7 mi (80 km).

CarriesOr 34 (hwy 27)
CrossesAlsea River
Location071 MI E HWY 9 JCT
RouteState Highway 34
StateOregon
Coordinates44.40503, -123.94267
Functional classRural Minor Arterial

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.1 US tons
Inventory rating20 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length375 ft (114.3 m)
Longest span160 ft (48.8 m)
Deck width39 ft (12 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,476 (2022)
Projected traffic1,600 by 2042
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed49.7 mi (80 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Or 34 (hwy 27) over Alsea River built?

It was built in 1940, making it 85 years old in 2025.

What condition is Or 34 (hwy 27) over Alsea 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 October 2023.

How much traffic does Or 34 (hwy 27) over Alsea River carry?

About 1,476 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is Or 34 (hwy 27) over Alsea River?

The structure is 375 ft (114.3 m) long with a longest span of 160 ft (48.8 m) and a deck 39 ft wide.

Who owns Or 34 (hwy 27) over Alsea River?

It is owned by the State Highway Agency.