US Bridges

I-5 (hwy 1) over Mill Creek Oflow

Fair

Marion County, Oregon · At Salem Scl · Structure no. 19127 001 25352

Built
2008
17 years old
Condition
Fair
inspected December 2023
Type
Slab
Prestressed Concrete
Length
100 ft
2 main spans
Daily traffic
101,907
2022 count
Owner
State
State Highway Agency

About this bridge

I-5 (hwy 1) over Mill Creek Oflow is a prestressed concrete slab carrying I-5 (hwy 1) over Mill Creek Oflow in Marion County, Oregon. It was built in 2008, so it is 17 years old, younger 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 101,907 vehicles a day, roughly 13% of them trucks, projected to reach 108,200 by 2042. The structure is 100 ft (30.5 m) long and 156 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-5 (hwy 1)
CrossesMill Creek Oflow
LocationAt Salem Scl
RouteInterstate 5
CountyMarion County
StateOregon
Coordinates44.91033, -122.98717
Functional classUrban Principal Arterial - Interstate

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.4 US tons
Inventory rating38.9 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length100 ft (30.5 m)
Longest span50 ft (15.2 m)
Deck width156 ft (47.7 m)
Roadway width152 ft (46.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic101,907 (2022)
Projected traffic108,200 by 2042
Trucks13%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-5 (hwy 1) over Mill Creek Oflow built?

It was built in 2008, making it 17 years old in 2025.

What condition is I-5 (hwy 1) over Mill Creek Oflow 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 I-5 (hwy 1) over Mill Creek Oflow carry?

About 101,907 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is I-5 (hwy 1) over Mill Creek Oflow?

The structure is 100 ft (30.5 m) long with a longest span of 50 ft (15.2 m) and a deck 156 ft wide.

Who owns I-5 (hwy 1) over Mill Creek Oflow?

It is owned by the State Highway Agency.