US Bridges

HWY 201 over N. Fork Alsea River

FairPosted for load

Benton County, Oregon · 010 MI S HWY 27 JCT · Structure no. 02305 201 00010

Built
1937
88 years old
Condition
Fair
inspected October 2023
Type
Truss - Thru
Steel
Length
218 ft
1 main span
Daily traffic
713
2022 count
Owner
State
State Highway Agency

About this bridge

HWY 201 over N. Fork Alsea River is a steel truss - thru carrying HWY 201 over N. Fork Alsea River in Benton County, Oregon. It was built in 1937, so it is 88 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 load restriction.

It carries about 713 vehicles a day, roughly 21% of them trucks, projected to reach 730 by 2042. The structure is 218 ft (66.5 m) long and 33 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesHWY 201
CrossesN. Fork Alsea River
Location010 MI S HWY 27 JCT
RouteState Highway 201
CountyBenton County
StateOregon
Coordinates44.38036, -123.59869
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be 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 rating25.4 US tons
Inventory rating19.6 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+4 approach)
Design loadH 15
Structure length218 ft (66.5 m)
Longest span100 ft (30.5 m)
Deck width33 ft (10.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic713 (2022)
Projected traffic730 by 2042
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.2 mi (10 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 HWY 201 over N. Fork Alsea River built?

It was built in 1937, making it 88 years old in 2025.

What condition is HWY 201 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 HWY 201 over N. Fork Alsea River carry?

About 713 vehicles per day (2022 count), of which roughly 21% are trucks.

How long is HWY 201 over N. Fork Alsea River?

The structure is 218 ft (66.5 m) long with a longest span of 100 ft (30.5 m) and a deck 33 ft wide.

Who owns HWY 201 over N. Fork Alsea River?

It is owned by the State Highway Agency.