US Bridges

S. Main Road over Oak Creek

Fair

Linn County, Oregon · 007 MI North CR 739 · Structure no. 77766 077700066

Built
1962
63 years old
Condition
Fair
inspected June 2023
Type
Slab
Prestressed Concrete
Length
40 ft
1 main span
Daily traffic
1,448
2021 count
Owner
County
County Highway Agency

About this bridge

S. Main Road over Oak Creek is a prestressed concrete slab carrying S. Main Road over Oak Creek in Linn County, Oregon. It was built in 1962, so it is 63 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 1,448 vehicles a day, roughly 15% of them trucks, projected to reach 1,963 by 2041. The structure is 40 ft (12.2 m) long and 33 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesS. Main Road
CrossesOak Creek
Location007 MI North CR 739
RouteCounty Highway A0492
CountyLinn County
StateOregon
Coordinates44.50252, -122.90841
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 inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating30 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span39 ft (11.9 m)
Deck width33 ft (10 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,448 (2021)
Projected traffic1,963 by 2041
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 S. Main Road over Oak Creek built?

It was built in 1962, making it 63 years old in 2025.

What condition is S. Main Road over Oak 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 June 2023.

How much traffic does S. Main Road over Oak Creek carry?

About 1,448 vehicles per day (2021 count), of which roughly 15% are trucks.

How long is S. Main Road over Oak Creek?

The structure is 40 ft (12.2 m) long with a longest span of 39 ft (11.9 m) and a deck 33 ft wide.

Who owns S. Main Road over Oak Creek?

It is owned by the County Highway Agency.