US Bridges

Main ST over Silver Creek

Fair

Marion County, Oregon · West of Water / Main Int. · Structure no. 47C100A57700000

Built
1974
51 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
81 ft
1 main span
Daily traffic
12,536
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Main ST over Silver Creek is a prestressed concrete stringer/multi-beam or girder carrying Main ST over Silver Creek in Marion County, Oregon. It was built in 1974, so it is 51 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 12,536 vehicles a day, roughly 8% of them trucks, projected to reach 13,286 by 2025. The structure is 81 ft (24.7 m) long and 47 ft wide.

CarriesMain ST
CrossesSilver Creek
LocationWest of Water / Main Int.
RouteCity Street A0577
StateOregon
Coordinates45.00494, -122.78348
Functional classUrban Collector

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.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98 US tons
Inventory rating71 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length81 ft (24.7 m)
Longest span80 ft (24.4 m)
Deck width47 ft (14.4 m)
Roadway width36 ft (10.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,536 (2020)
Projected traffic13,286 by 2025
Trucks8%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$415,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Main ST over Silver Creek built?

It was built in 1974, making it 51 years old in 2025.

What condition is Main ST over Silver 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 2024.

How much traffic does Main ST over Silver Creek carry?

About 12,536 vehicles per day (2020 count), of which roughly 8% are trucks.

How long is Main ST over Silver Creek?

The structure is 81 ft (24.7 m) long with a longest span of 80 ft (24.4 m) and a deck 47 ft wide.

Who owns Main ST over Silver Creek?

It is owned by the City or Municipal Highway Agency.