US Bridges

Coburg Road over Mckenzie River

Fair

Lane County, Oregon · 050 MI N Eugene · Structure no. 001336150000487

Built
1984
41 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
524 ft
2 main spans
Daily traffic
10,265
2020 count
Owner
County
County Highway Agency

About this bridge

Coburg Road over Mckenzie River is a prestressed concrete continuous stringer/multi-beam or girder carrying Coburg Road over Mckenzie River in Lane County, Oregon. It was built in 1984, so it is 41 years old, younger 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 10,265 vehicles a day, roughly 15% of them trucks, projected to reach 15,613 by 2025. The structure is 524 ft (159.7 m) long and 43 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesCoburg Road
CrossesMckenzie River
Location050 MI N Eugene
RouteCounty Highway A0465
CountyLane County
StateOregon
Coordinates44.1125, -123.04723
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation7: Better than 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 alignment7: Better than present minimum criteria
Operating rating41.8 US tons
Inventory rating32.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20 + Mod
Structure length524 ft (159.7 m)
Longest span220 ft (67.1 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,265 (2020)
Projected traffic15,613 by 2025
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and waterway
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 Coburg Road over Mckenzie River built?

It was built in 1984, making it 41 years old in 2025.

What condition is Coburg Road over Mckenzie 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 Mckenzie River carry?

About 10,265 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is Coburg Road over Mckenzie River?

The structure is 524 ft (159.7 m) long with a longest span of 220 ft (67.1 m) and a deck 43 ft wide.

Who owns Coburg Road over Mckenzie River?

It is owned by the County Highway Agency.