US Bridges

State Street over Mill Creek

Fair

Marion County, Oregon · Between 19th and 21st · Structure no. 470238

Built
1929
96 years old
Condition
Fair
inspected August 2023
Type
Tee Beam
Concrete
Length
42 ft
1 main span
Daily traffic
40,878
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

State Street over Mill Creek is a concrete tee beam carrying State Street over Mill Creek in Marion County, Oregon. It was built in 1929, 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 42 ft (12.8 m) long and 60 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesState Street
CrossesMill Creek
LocationBetween 19th and 21st
RouteCity Street 0
StateOregon
Coordinates44.93455, -123.01761
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
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 rating26.8 US tons
Inventory rating20.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length42 ft (12.8 m)
Longest span39 ft (11.9 m)
Deck width60 ft (18.3 m)
Roadway width44 ft (13.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40,878 (2020)
Projected traffic58,809 by 2025
Trucks10%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed0.6 mi (1 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$205,000
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.

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 42 ft (12.8 m) long with a longest span of 39 ft (11.9 m) and a deck 60 ft wide.

Who owns State Street over Mill Creek?

It is owned by the City or Municipal Highway Agency.