US Bridges

18th ST NE over Mill Creek

Fair

Marion County, Oregon · 300 Block · Structure no. 470232000

Built
1941
84 years old
Condition
Fair
inspected August 2023
Type
Tee Beam
Concrete
Length
44 ft
1 main span
Daily traffic
2,192
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

18th ST NE over Mill Creek is a concrete tee beam carrying 18th ST NE over Mill Creek in Marion County, Oregon. It was built in 1941, so it is 84 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 2,192 vehicles a day, roughly 1% of them trucks, projected to reach 2,444 by 2025. The structure is 44 ft (13.4 m) long and 36 ft wide.

Location

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Carries18th ST NE
CrossesMill Creek
Location300 Block
RouteCity Street C0000
CountyMarion County
StateOregon
Coordinates44.93751, -123.01768
Functional classUrban Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.2 US tons
Inventory rating33.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length44 ft (13.4 m)
Longest span41 ft (12.5 m)
Deck width36 ft (11 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,192 (2020)
Projected traffic2,444 by 2025
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 18th ST NE over Mill Creek built?

It was built in 1941, making it 84 years old in 2025.

What condition is 18th ST NE 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 August 2023.

How much traffic does 18th ST NE over Mill Creek carry?

About 2,192 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is 18th ST NE over Mill Creek?

The structure is 44 ft (13.4 m) long with a longest span of 41 ft (12.5 m) and a deck 36 ft wide.

Who owns 18th ST NE over Mill Creek?

It is owned by the City or Municipal Highway Agency.