US Bridges

HWY 105 over Belt Line

FairPosted for load

Clatsop County, Oregon · In Astoria · Structure no. 02418 105 00710

Built
1921
104 years old
Condition
Fair
inspected October 2023
Type
Slab
Concrete Continuous
Length
38 ft
2 main spans
Daily traffic
7,781
2022 count
Owner
State
State Highway Agency

About this bridge

HWY 105 over Belt Line is a concrete continuous slab carrying HWY 105 over Belt Line in Clatsop County, Oregon. It was built in 1921, so it is 104 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 7,781 vehicles a day, roughly 14% of them trucks, projected to reach 9,900 by 2042. The structure is 38 ft (11.5 m) long and 39 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesHWY 105
CrossesBelt Line
LocationIn Astoria
RouteState Highway 101
CountyClatsop County
StateOregon
Coordinates46.17173, -123.83825
Functional classUrban 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.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42 US tons
Inventory rating25 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length38 ft (11.5 m)
Longest span19 ft (5.7 m)
Deck width39 ft (11.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,781 (2022)
Projected traffic9,900 by 2042
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$193,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was HWY 105 over Belt Line built?

It was built in 1921, making it 104 years old in 2025.

What condition is HWY 105 over Belt Line 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 Belt Line carry?

About 7,781 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is HWY 105 over Belt Line?

The structure is 38 ft (11.5 m) long with a longest span of 19 ft (5.7 m) and a deck 39 ft wide.

Who owns HWY 105 over Belt Line?

It is owned by the State Highway Agency.