US Bridges

Knox Butte RD over Truax Creek

Fair

Linn County, Oregon · 020MI E ST HWY I5 · Structure no. 12729 000700196

Built
1967
58 years old
Condition
Fair
inspected June 2023
Type
Slab
Prestressed Concrete
Length
46 ft
1 main span
Daily traffic
3,811
2021 count
Owner
County
County Highway Agency

About this bridge

Knox Butte RD over Truax Creek is a prestressed concrete slab carrying Knox Butte RD over Truax Creek in Linn County, Oregon. It was built in 1967, so it is 58 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 3,811 vehicles a day, roughly 12% of them trucks, projected to reach 5,356 by 2041. The structure is 46 ft (14 m) long and 40 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesKnox Butte RD
CrossesTruax Creek
Location020MI E ST HWY I5
RouteCounty Highway C0007
CountyLinn County
StateOregon
Coordinates44.64734, -123.02194
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
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85.3 US tons
Inventory rating65.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length46 ft (14 m)
Longest span45 ft (13.7 m)
Deck width40 ft (12.2 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,811 (2021)
Projected traffic5,356 by 2041
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.8 mi (11 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 Knox Butte RD over Truax Creek built?

It was built in 1967, making it 58 years old in 2025.

What condition is Knox Butte RD over Truax 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 Knox Butte RD over Truax Creek carry?

About 3,811 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is Knox Butte RD over Truax Creek?

The structure is 46 ft (14 m) long with a longest span of 45 ft (13.7 m) and a deck 40 ft wide.

Who owns Knox Butte RD over Truax Creek?

It is owned by the County Highway Agency.