US Bridges

US 20 (hwy 33) over Oak Creek

Fair

Benton County, Oregon · 005 MI E of Corvallis Wcl · Structure no. 08628 033 05516

Built
1960
65 years old
Condition
Fair
inspected July 2024
Type
Culvert
Concrete Continuous
Length
24 ft
2 main spans
Daily traffic
22,169
2022 count
Owner
State
State Highway Agency

About this bridge

US 20 (hwy 33) over Oak Creek is a concrete continuous culvert carrying US 20 (hwy 33) over Oak Creek in Benton 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 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 22,169 vehicles a day, roughly 6% of them trucks, projected to reach 25,800 by 2042. The structure is 24 ft (7.3 m) long. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesUS 20 (hwy 33)
CrossesOak Creek
Location005 MI E of Corvallis Wcl
RouteU.S. Route 20
CountyBenton County
StateOregon
Coordinates44.55515, -123.27954
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.6 US tons
Inventory rating29.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length24 ft (7.3 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,169 (2022)
Projected traffic25,800 by 2042
Trucks6%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 20 (hwy 33) over Oak Creek built?

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

What condition is US 20 (hwy 33) over Oak 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 2024.

How much traffic does US 20 (hwy 33) over Oak Creek carry?

About 22,169 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is US 20 (hwy 33) over Oak Creek?

The structure is 24 ft (7.3 m) long with a longest span of 12 ft (3.7 m).

Who owns US 20 (hwy 33) over Oak Creek?

It is owned by the State Highway Agency.