US Bridges

Public Road over Mckenzie River

Fair

Linn County, Oregon · 11.0MI S of JCT HWY20&126 · Structure no. 18750 00000 001

Built
1960
65 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
182 ft
3 main spans
Daily traffic
138
2020 count
Owner
Local
Other Local Agency

About this bridge

Public Road over Mckenzie River is a prestressed concrete continuous stringer/multi-beam or girder carrying Public Road over Mckenzie River in Linn County, Oregon. It was built in 1960, so it is 65 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 138 vehicles a day, roughly 2% of them trucks, projected to reach 154 by 2025. The structure is 182 ft (55.5 m) long and 20 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesPublic Road
CrossesMckenzie River
Location11.0MI S of JCT HWY20&126
CountyLinn County
StateOregon
Coordinates44.28586, -122.04024
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating20 US tons
Inventory rating15.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length182 ft (55.5 m)
Longest span90 ft (27.4 m)
Deck width20 ft (6.1 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic138 (2020)
Projected traffic154 by 2025
Trucks2%
Lanes on structure2
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther Local Agency
Maintained byOther Local Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$932,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Public Road over Mckenzie River built?

It was built in 1960, making it 65 years old in 2025.

What condition is Public 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 July 2024.

How much traffic does Public Road over Mckenzie River carry?

About 138 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Public Road over Mckenzie River?

The structure is 182 ft (55.5 m) long with a longest span of 90 ft (27.4 m) and a deck 20 ft wide.

Who owns Public Road over Mckenzie River?

It is owned by the Other Local Agency.