US Bridges

Or 18 (hwy 39) over Mill Creek

Fair

Yamhill County, Oregon · 005 MI E Polk Yam CO LN · Structure no. 08060 039 03038

Built
1957
68 years old
Condition
Fair
inspected November 2024
Type
Tee Beam
Concrete Continuous
Length
180 ft
4 main spans
Daily traffic
8,519
2022 count
Owner
State
State Highway Agency

About this bridge

Or 18 (hwy 39) over Mill Creek is a concrete continuous tee beam carrying Or 18 (hwy 39) over Mill Creek in Yamhill County, Oregon. It was built in 1957, so it is 68 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 5 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 8,519 vehicles a day, roughly 9% of them trucks, projected to reach 8,600 by 2042. The structure is 180 ft (54.9 m) long and 35 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesOr 18 (hwy 39)
CrossesMill Creek
Location005 MI E Polk Yam CO LN
RouteState Highway 18
CountyYamhill County
StateOregon
Coordinates45.0785, -123.4382
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating27.9 US tons
Inventory rating21.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length180 ft (54.9 m)
Longest span50 ft (15.2 m)
Deck width35 ft (10.6 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,519 (2022)
Projected traffic8,600 by 2042
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$922,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Or 18 (hwy 39) over Mill Creek built?

It was built in 1957, making it 68 years old in 2025.

What condition is Or 18 (hwy 39) over Mill Creek 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 Mill Creek carry?

About 8,519 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is Or 18 (hwy 39) over Mill Creek?

The structure is 180 ft (54.9 m) long with a longest span of 50 ft (15.2 m) and a deck 35 ft wide.

Who owns Or 18 (hwy 39) over Mill Creek?

It is owned by the State Highway Agency.