US Bridges

Frontage RD (I-5) over Miller Creek

FairPosted for load

Marion County, Oregon · 00.0 at HWY 164 JCT · Structure no. 00365A001F24486

Built
1920
105 years old, rebuilt 1982
Condition
Fair
inspected December 2023
Type
Slab
Concrete
Length
20 ft
1 main span
Daily traffic
744
2022 count
Owner
State
State Highway Agency

About this bridge

Frontage RD (I-5) over Miller Creek is a concrete slab carrying Frontage RD (I-5) over Miller Creek in Marion County, Oregon. It was built in 1920 and reconstructed in 1982, so it is 105 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 load restriction.

It carries about 744 vehicles a day, roughly 15% of them trucks, projected to reach 700 by 2030. The structure is 20 ft (6.1 m) long and 35 ft wide.

Location

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CarriesFrontage RD (I-5)
CrossesMiller Creek
Location00.0 at HWY 164 JCT
RouteState Highway 5
CountyMarion County
StateOregon
Coordinates44.79596, -123.03437
Functional classRural 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating29.7 US tons
Inventory rating22.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length20 ft (6.1 m)
Longest span20 ft (6.1 m)
Deck width35 ft (10.6 m)
Roadway width33 ft (10.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic744 (2022)
Projected traffic700 by 2030
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

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 Frontage RD (I-5) over Miller Creek built?

It was built in 1920, making it 105 years old in 2025. It was reconstructed in 1982.

What condition is Frontage RD (I-5) over Miller 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 December 2023.

How much traffic does Frontage RD (I-5) over Miller Creek carry?

About 744 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is Frontage RD (I-5) over Miller Creek?

The structure is 20 ft (6.1 m) long with a longest span of 20 ft (6.1 m) and a deck 35 ft wide.

Who owns Frontage RD (I-5) over Miller Creek?

It is owned by the State Highway Agency.