US Bridges

Knox Butte RD over Burkhart Creek

Fair

Linn County, Oregon · 0.8 MI E I 5 · Structure no. 07079 000700079

Built
1975
50 years old
Condition
Fair
inspected July 2023
Type
Slab
Prestressed Concrete
Length
40 ft
1 main span
Daily traffic
5,150
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Knox Butte RD over Burkhart Creek is a prestressed concrete slab carrying Knox Butte RD over Burkhart Creek in Linn County, Oregon. It was built in 1975, so it is 50 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 5,150 vehicles a day, roughly 10% of them trucks, projected to reach 9,442 by 2041. The structure is 40 ft (12.2 m) long and 40 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesKnox Butte RD
CrossesBurkhart Creek
Location0.8 MI E I 5
RouteCity Street 0
CountyLinn County
StateOregon
Coordinates44.6437, -123.04352
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 inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to 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 alignment8: Equal to present desirable criteria
Operating rating42.1 US tons
Inventory rating32.5 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span39 ft (11.9 m)
Deck width40 ft (12.2 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,150 (2021)
Projected traffic9,442 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Burkhart Creek built?

It was built in 1975, making it 50 years old in 2025.

What condition is Knox Butte RD over Burkhart 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 July 2023.

How much traffic does Knox Butte RD over Burkhart Creek carry?

About 5,150 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is Knox Butte RD over Burkhart Creek?

The structure is 40 ft (12.2 m) long with a longest span of 39 ft (11.9 m) and a deck 40 ft wide.

Who owns Knox Butte RD over Burkhart Creek?

It is owned by the City or Municipal Highway Agency.