US Bridges

Or 99E (hwy 58) NB over Knox Butte Road

Fair

Linn County, Oregon · 003 MI S Albany · Structure no. 08221E058 00046

Built
1958
67 years old
Condition
Fair
inspected January 2023
Type
Tee Beam
Concrete Continuous
Length
130 ft
3 main spans
Daily traffic
13,762
2022 count
Owner
State
State Highway Agency

About this bridge

Or 99E (hwy 58) NB over Knox Butte Road is a concrete continuous tee beam carrying Or 99E (hwy 58) NB over Knox Butte Road in Linn County, Oregon. It was built in 1958, so it is 67 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 13,762 vehicles a day, roughly 2% of them trucks, projected to reach 16,150 by 2042. The structure is 130 ft (39.6 m) long and 41 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesOr 99E (hwy 58) NB
CrossesKnox Butte Road
Location003 MI S Albany
RouteState Highway 99
CountyLinn County
StateOregon
Coordinates44.64481, -123.06134
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.9 US tons
Inventory rating22.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length130 ft (39.6 m)
Longest span50 ft (15.2 m)
Deck width41 ft (12.4 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,762 (2022)
Projected traffic16,150 by 2042
Trucks2%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Or 99E (hwy 58) NB over Knox Butte Road built?

It was built in 1958, making it 67 years old in 2025.

What condition is Or 99E (hwy 58) NB over Knox Butte Road 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 January 2023.

How much traffic does Or 99E (hwy 58) NB over Knox Butte Road carry?

About 13,762 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is Or 99E (hwy 58) NB over Knox Butte Road?

The structure is 130 ft (39.6 m) long with a longest span of 50 ft (15.2 m) and a deck 41 ft wide.

Who owns Or 99E (hwy 58) NB over Knox Butte Road?

It is owned by the State Highway Agency.