US Bridges

Or 18-HWY 483 over South Yamhill River

Good

Yamhill County, Oregon · 060 MI SW HWY 1W JCT · Structure no. 22688 483 04675

Built
2023
2 years old
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
970 ft
5 main spans
Daily traffic
14,355
2022 count
Owner
State
State Highway Agency

About this bridge

Or 18-HWY 483 over South Yamhill River is a steel continuous stringer/multi-beam or girder carrying Or 18-HWY 483 over South Yamhill River in Yamhill County, Oregon. It was built in 2023, so it is 2 years old, younger than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 14,355 vehicles a day, roughly 8% of them trucks, projected to reach 17,700 by 2042. The structure is 970 ft (295.7 m) long and 49 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesOr 18-HWY 483
CrossesSouth Yamhill River
Location060 MI SW HWY 1W JCT
RouteState Highway 18
CountyYamhill County
StateOregon
Coordinates45.20559, -123.18224
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being 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 rating34 US tons
Inventory rating26.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHL 93
Structure length970 ft (295.7 m)
Longest span250 ft (76.2 m)
Deck width49 ft (15 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,355 (2022)
Projected traffic17,700 by 2042
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Or 18-HWY 483 over South Yamhill River built?

It was built in 2023, making it 2 years old in 2025.

What condition is Or 18-HWY 483 over South Yamhill River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2023.

How much traffic does Or 18-HWY 483 over South Yamhill River carry?

About 14,355 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is Or 18-HWY 483 over South Yamhill River?

The structure is 970 ft (295.7 m) long with a longest span of 250 ft (76.2 m) and a deck 49 ft wide.

Who owns Or 18-HWY 483 over South Yamhill River?

It is owned by the State Highway Agency.