US Bridges

Or 18 (hwy 39) over S. Yamhill R. & HWY 157

Fair

Polk County, Oregon · 026 MI W Polk Yam CO LN · Structure no. 08320 039 02717

Built
1958
67 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
416 ft
3 main spans
Daily traffic
8,172
2022 count
Owner
State
State Highway Agency

About this bridge

Or 18 (hwy 39) over S. Yamhill R. & HWY 157 is a steel continuous stringer/multi-beam or girder carrying Or 18 (hwy 39) over S. Yamhill R. & HWY 157 in Polk County, Oregon. It was built in 1958, so it is 67 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 8,172 vehicles a day, roughly 9% of them trucks, projected to reach 8,700 by 2042. The structure is 416 ft (126.7 m) long and 47 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesOr 18 (hwy 39)
CrossesS. Yamhill R. & HWY 157
Location026 MI W Polk Yam CO LN
RouteState Highway 18
CountyPolk County
StateOregon
Coordinates45.0548, -123.493
Functional classRural Principal Arterial - Other

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 protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 rating39 US tons
Inventory rating23 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+1 approach)
Design loadHS 20
Structure length416 ft (126.7 m)
Longest span140 ft (42.7 m)
Deck width47 ft (14.3 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,172 (2022)
Projected traffic8,700 by 2042
Trucks9%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed1.2 mi (2 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 39) over S. Yamhill R. & HWY 157 built?

It was built in 1958, making it 67 years old in 2025.

What condition is Or 18 (hwy 39) over S. Yamhill R. & HWY 157 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 November 2024.

How much traffic does Or 18 (hwy 39) over S. Yamhill R. & HWY 157 carry?

About 8,172 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is Or 18 (hwy 39) over S. Yamhill R. & HWY 157?

The structure is 416 ft (126.7 m) long with a longest span of 140 ft (42.7 m) and a deck 47 ft wide.

Who owns Or 18 (hwy 39) over S. Yamhill R. & HWY 157?

It is owned by the State Highway Agency.