US Bridges

Or 34 (hwy 27) over N. Fork Alsea River

FairPosted for load

Benton County, Oregon · 032 MI E Alsea · Structure no. 01204 027 04303

Built
1927
98 years old
Condition
Fair
inspected October 2023
Type
Truss - Thru
Steel
Length
171 ft
1 main span
Daily traffic
1,633
2022 count
Owner
State
State Highway Agency

About this bridge

Or 34 (hwy 27) over N. Fork Alsea River is a steel truss - thru carrying Or 34 (hwy 27) over N. Fork Alsea River in Benton County, Oregon. It was built in 1927, so it is 98 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 5 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 1,633 vehicles a day, roughly 16% of them trucks, projected to reach 1,700 by 2042. The structure is 171 ft (52 m) long and 23 ft wide. If it were closed, the detour would be 24.9 mi (40 km).

Location

Open in Google Maps
CarriesOr 34 (hwy 27)
CrossesN. Fork Alsea River
Location032 MI E Alsea
RouteState Highway 34
CountyBenton County
StateOregon
Coordinates44.41573, -123.56257
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
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; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating22.2 US tons
Inventory rating17.2 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadH 15
Structure length171 ft (52 m)
Longest span100 ft (30.6 m)
Deck width23 ft (7.1 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,633 (2022)
Projected traffic1,700 by 2042
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.9 mi (40 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$874,000
NavigationNo navigation control on waterway

Frequently asked questions

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

It was built in 1927, making it 98 years old in 2025.

What condition is Or 34 (hwy 27) over N. Fork 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 N. Fork Alsea River carry?

About 1,633 vehicles per day (2022 count), of which roughly 16% are trucks.

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

The structure is 171 ft (52 m) long with a longest span of 100 ft (30.6 m) and a deck 23 ft wide.

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

It is owned by the State Highway Agency.