US Bridges

Coburg Road over Willamette River

Fair

Lane County, Oregon · Willamette R at Coburg RD · Structure no. 06648 000 00043

Built
1950
75 years old, rebuilt 1999
Condition
Fair
inspected May 2023
Type
Truss - Thru
Steel Continuous
Length
796 ft
2 main spans
Daily traffic
74,362
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Coburg Road over Willamette River is a steel continuous truss - thru carrying Coburg Road over Willamette River in Lane County, Oregon. It was built in 1950 and reconstructed in 1999, so it is 75 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 74,362 vehicles a day, roughly 20% of them trucks, projected to reach 129,787 by 2025. The structure is 796 ft (242.6 m) long and 79 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesCoburg Road
CrossesWillamette River
LocationWillamette R at Coburg RD
RouteCity Street U1305
StateOregon
Coordinates44.05806, -123.08388
Functional classUrban Other Principal 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation2: Basically intolerable, requiring high priority of replacement
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 rating21.4 US tons
Inventory rating16.4 US tons

Structure

Structure typeTruss - Thru
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+7 approach)
Design loadH 15
Structure length796 ft (242.6 m)
Longest span221 ft (67.4 m)
Deck width79 ft (24 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deck15 ft (4.6 m)

Traffic and service

Average daily traffic74,362 (2020)
Projected traffic129,787 by 2025
Trucks20%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and waterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$4.5 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Coburg Road over Willamette River built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1999.

What condition is Coburg Road over Willamette 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 May 2023.

How much traffic does Coburg Road over Willamette River carry?

About 74,362 vehicles per day (2020 count), of which roughly 20% are trucks.

How long is Coburg Road over Willamette River?

The structure is 796 ft (242.6 m) long with a longest span of 221 ft (67.4 m) and a deck 79 ft wide.

Who owns Coburg Road over Willamette River?

It is owned by the City or Municipal Highway Agency.