US Bridges

State Street over Mill Creek

Fair

Marion County, Oregon · E of Airport RD · Structure no. 470250000F00009

Built
1949
76 years old, rebuilt 1996
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
242 ft
2 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 prestressed concrete stringer/multi-beam or girder carrying State Street over Mill Creek in Marion County, Oregon. It was built in 1949 and reconstructed in 1996, so it is 76 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 5 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 242 ft (73.8 m) long and 88 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesState Street
CrossesMill Creek
LocationE of Airport RD
RouteCity Street 1620
StateOregon
Coordinates44.92862, -123.00227
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating23.9 US tons
Inventory rating18.2 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 15
Structure length242 ft (73.8 m)
Longest span97 ft (29.6 m)
Deck width88 ft (26.7 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 1949, making it 76 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 242 ft (73.8 m) long with a longest span of 97 ft (29.6 m) and a deck 88 ft wide.

Who owns State Street over Mill Creek?

It is owned by the City or Municipal Highway Agency.