US Bridges

State Street over Mill Creek

Fair

Marion County, Oregon · W of Arpt Rd/Dep Forestry · Structure no. 470249

Built
1929
96 years old, rebuilt 1996
Condition
Fair
inspected August 2023
Type
Tee Beam
Concrete Continuous
Length
107 ft
3 main spans
Daily traffic
40,878
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

State Street over Mill Creek is a concrete continuous tee beam carrying State Street over Mill Creek in Marion County, Oregon. It was built in 1929 and reconstructed in 1996, so it is 96 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 40,878 vehicles a day, roughly 10% of them trucks, projected to reach 58,809 by 2025. The structure is 107 ft (32.6 m) long and 86 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesState Street
CrossesMill Creek
LocationW of Arpt Rd/Dep Forestry
RouteCity Street 0
StateOregon
Coordinates44.93122, -123.00716
Functional classUrban Minor Arterial

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 protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating29.7 US tons
Inventory rating22.8 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length107 ft (32.6 m)
Longest span40 ft (12.2 m)
Deck width86 ft (26.2 m)
Roadway width72 ft (21.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40,878 (2020)
Projected traffic58,809 by 2025
Trucks10%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
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 State Street over Mill Creek built?

It was built in 1929, making it 96 years old in 2025. It was reconstructed in 1996.

What condition is State Street 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 State Street over Mill Creek carry?

About 40,878 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is State Street over Mill Creek?

The structure is 107 ft (32.6 m) long with a longest span of 40 ft (12.2 m) and a deck 86 ft wide.

Who owns State Street over Mill Creek?

It is owned by the City or Municipal Highway Agency.