US Bridges

HWY 105 over Skipanon River

Fair

Clatsop County, Oregon · 00.2 MI E Ft Stevens Sec · Structure no. 11226A105 00017

Built
1978
47 years old
Condition
Fair
inspected October 2023
Type
Slab
Prestressed Concrete
Length
671 ft
15 main spans
Daily traffic
8,785
2022 count
Owner
State
State Highway Agency

About this bridge

HWY 105 over Skipanon River is a prestressed concrete slab carrying HWY 105 over Skipanon River in Clatsop County, Oregon. It was built in 1978, so it is 47 years old, younger 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 8,785 vehicles a day, roughly 12% of them trucks, projected to reach 9,200 by 2042. The structure is 671 ft (204.5 m) long and 47 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

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CarriesHWY 105
CrossesSkipanon River
Location00.2 MI E Ft Stevens Sec
RouteState Highway 101
CountyClatsop County
StateOregon
Coordinates46.16505, -123.92097
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.
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 statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
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 rating45 US tons
Inventory rating34.6 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans15
Design loadHS 20
Structure length671 ft (204.5 m)
Longest span60 ft (18.3 m)
Deck width47 ft (14.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,785 (2022)
Projected traffic9,200 by 2042
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed2.5 mi (4 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 proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was HWY 105 over Skipanon River built?

It was built in 1978, making it 47 years old in 2025.

What condition is HWY 105 over Skipanon 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 105 over Skipanon River carry?

About 8,785 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is HWY 105 over Skipanon River?

The structure is 671 ft (204.5 m) long with a longest span of 60 ft (18.3 m) and a deck 47 ft wide.

Who owns HWY 105 over Skipanon River?

It is owned by the State Highway Agency.