US Bridges

US 20 (hwy 33) over Marys River

FairPosted for load

Benton County, Oregon · 017 MI W of Philomath · Structure no. 01075A033 04888

Built
1954
71 years old
Condition
Fair
inspected July 2023
Type
Tee Beam
Concrete Continuous
Length
170 ft
3 main spans
Daily traffic
12,164
2022 count
Owner
State
State Highway Agency

About this bridge

US 20 (hwy 33) over Marys River is a concrete continuous tee beam carrying US 20 (hwy 33) over Marys River in Benton County, Oregon. It was built in 1954, so it is 71 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. Its operating status is: posted for other load-capacity restriction.

It carries about 12,164 vehicles a day, roughly 6% of them trucks, projected to reach 12,300 by 2042. The structure is 170 ft (51.8 m) long and 35 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesUS 20 (hwy 33)
CrossesMarys River
Location017 MI W of Philomath
RouteU.S. Route 20
CountyBenton County
StateOregon
Coordinates44.54765, -123.39889
Functional classRural Principal Arterial - Other

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.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.9 US tons
Inventory rating30 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length170 ft (51.8 m)
Longest span66 ft (20.1 m)
Deck width35 ft (10.7 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,164 (2022)
Projected traffic12,300 by 2042
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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$871,000
NavigationNo navigation control on waterway

Frequently asked questions

When was US 20 (hwy 33) over Marys River built?

It was built in 1954, making it 71 years old in 2025.

What condition is US 20 (hwy 33) over Marys River 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 US 20 (hwy 33) over Marys River carry?

About 12,164 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is US 20 (hwy 33) over Marys River?

The structure is 170 ft (51.8 m) long with a longest span of 66 ft (20.1 m) and a deck 35 ft wide.

Who owns US 20 (hwy 33) over Marys River?

It is owned by the State Highway Agency.