US Bridges

Main ST over Calapooia River

FairPosted for load

Linn County, Oregon · In City of Brownsville · Structure no. 02373 042500028

Built
1940
85 years old, rebuilt 1966
Condition
Fair
inspected August 2023
Type
Truss - Thru
Steel
Length
508 ft
1 main span
Daily traffic
5,562
2021 count
Owner
County
County Highway Agency

About this bridge

Main ST over Calapooia River is a steel truss - thru carrying Main ST over Calapooia River in Linn County, Oregon. It was built in 1940 and reconstructed in 1966, so it is 85 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. Its operating status is: posted for load restriction.

It carries about 5,562 vehicles a day, roughly 10% of them trucks, projected to reach 7,828 by 2041. The structure is 508 ft (154.8 m) long and 37 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

Open in Google Maps
CarriesMain ST
CrossesCalapooia River
LocationIn City of Brownsville
RouteCounty Highway A0481
CountyLinn County
StateOregon
Coordinates44.3908, -122.9844
Functional classRural Major 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
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 rating21.8 US tons
Inventory rating16.8 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+9 approach)
Design loadH 15
Structure length508 ft (154.8 m)
Longest span130 ft (39.6 m)
Deck width37 ft (11.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deck14 ft (4.3 m)

Traffic and service

Average daily traffic5,562 (2021)
Projected traffic7,828 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed16.8 mi (27 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$2.6 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Main ST over Calapooia River built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1966.

What condition is Main ST over Calapooia River 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 Main ST over Calapooia River carry?

About 5,562 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is Main ST over Calapooia River?

The structure is 508 ft (154.8 m) long with a longest span of 130 ft (39.6 m) and a deck 37 ft wide.

Who owns Main ST over Calapooia River?

It is owned by the County Highway Agency.