US Bridges

I-5 (hwy 1) SB over Mill Creek

Fair

Marion County, Oregon · At Salem Scl · Structure no. 20035 001 25257

Built
2007
18 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
200 ft
3 main spans
Daily traffic
42,287
2022 count
Owner
State
State Highway Agency

About this bridge

I-5 (hwy 1) SB over Mill Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying I-5 (hwy 1) SB over Mill Creek in Marion County, Oregon. It was built in 2007, so it is 18 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 42,287 vehicles a day, roughly 13% of them trucks, projected to reach 46,450 by 2042. The structure is 200 ft (61.1 m) long and 73 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-5 (hwy 1) SB
CrossesMill Creek
LocationAt Salem Scl
RouteInterstate 5
CountyMarion County
StateOregon
Coordinates44.8969, -122.98603
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.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
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 rating47.2 US tons
Inventory rating36.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length200 ft (61.1 m)
Longest span82 ft (25.1 m)
Deck width73 ft (22.4 m)
Roadway width71 ft (21.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic42,287 (2022)
Projected traffic46,450 by 2042
Trucks13%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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) SB over Mill Creek built?

It was built in 2007, making it 18 years old in 2025.

What condition is I-5 (hwy 1) SB 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 December 2023.

How much traffic does I-5 (hwy 1) SB over Mill Creek carry?

About 42,287 vehicles per day (2022 count), of which roughly 13% are trucks.

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

The structure is 200 ft (61.1 m) long with a longest span of 82 ft (25.1 m) and a deck 73 ft wide.

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

It is owned by the State Highway Agency.