US Bridges

Salmonberry RD over Alsea River

Fair

Benton County, Oregon · 0027 MI SE of HWY 34 · Structure no. 14536A000

Built
1959
66 years old
Condition
Fair
inspected July 2024
Type
Tee Beam
Concrete Continuous
Length
183 ft
3 main spans
Daily traffic
75
2020 count
Owner
County
County Highway Agency

About this bridge

Salmonberry RD over Alsea River is a concrete continuous tee beam carrying Salmonberry RD over Alsea River in Benton County, Oregon. It was built in 1959, so it is 66 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 75 vehicles a day, projected to reach 109 by 2040. The structure is 183 ft (55.8 m) long and 29 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesSalmonberry RD
CrossesAlsea River
Location0027 MI SE of HWY 34
RouteCounty Highway 0
CountyBenton County
StateOregon
Coordinates44.34293, -123.68676
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40.7 US tons
Inventory rating31.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length183 ft (55.8 m)
Longest span70 ft (21.3 m)
Deck width29 ft (8.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2020)
Projected traffic109 by 2040
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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 Salmonberry RD over Alsea River built?

It was built in 1959, making it 66 years old in 2025.

What condition is Salmonberry RD 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 July 2024.

How much traffic does Salmonberry RD over Alsea River carry?

About 75 vehicles per day (2020 count).

How long is Salmonberry RD over Alsea River?

The structure is 183 ft (55.8 m) long with a longest span of 70 ft (21.3 m) and a deck 29 ft wide.

Who owns Salmonberry RD over Alsea River?

It is owned by the County Highway Agency.