US Bridges

US 20 (hwy 33) EB over HWY 91 SB

Fair

Benton County, Oregon · At JCT of HWY 1W · Structure no. 08616 033 05586

Built
1960
65 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
471 ft
1 main span
Daily traffic
3,280
2022 count
Owner
State
State Highway Agency

About this bridge

US 20 (hwy 33) EB over HWY 91 SB is a steel stringer/multi-beam or girder carrying US 20 (hwy 33) EB over HWY 91 SB 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 3,280 vehicles a day, roughly 6% of them trucks, projected to reach 3,300 by 2030. The structure is 471 ft (143.6 m) long and 25 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesUS 20 (hwy 33) EB
CrossesHWY 91 SB
LocationAt JCT of HWY 1W
RouteU.S. Route 20
CountyBenton County
StateOregon
Coordinates44.55628, -123.26594
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.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating32.8 US tons
Inventory rating25.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+7 approach)
Design loadHS 20
Structure length471 ft (143.6 m)
Longest span66 ft (20.1 m)
Deck width25 ft (7.7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,280 (2022)
Projected traffic3,300 by 2030
Trucks6%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$2.4 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 20 (hwy 33) EB over HWY 91 SB built?

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

What condition is US 20 (hwy 33) EB over HWY 91 SB 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 May 2023.

How much traffic does US 20 (hwy 33) EB over HWY 91 SB carry?

About 3,280 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is US 20 (hwy 33) EB over HWY 91 SB?

The structure is 471 ft (143.6 m) long with a longest span of 66 ft (20.1 m) and a deck 25 ft wide.

Who owns US 20 (hwy 33) EB over HWY 91 SB?

It is owned by the State Highway Agency.