US Bridges

Or 99W (hwy 91) SB over Marys River

Fair

Benton County, Oregon · In Corvallis · Structure no. 07019 01W 08421

Built
1949
76 years old, rebuilt 1992
Condition
Fair
inspected April 2023
Type
Tee Beam
Concrete Continuous
Length
406 ft
8 main spans
Daily traffic
23,359
2022 count
Owner
State
State Highway Agency

About this bridge

Or 99W (hwy 91) SB over Marys River is a concrete continuous tee beam carrying Or 99W (hwy 91) SB over Marys River in Benton County, Oregon. It was built in 1949 and reconstructed in 1992, so it is 76 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 5 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 23,359 vehicles a day, roughly 3% of them trucks, projected to reach 29,900 by 2042. The structure is 406 ft (123.7 m) long and 50 ft wide. If it were closed, the detour would be 4.3 mi (7 km).

Location

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CarriesOr 99W (hwy 91) SB
CrossesMarys River
LocationIn Corvallis
RouteState Highway 99
CountyBenton County
StateOregon
Coordinates44.55584, -123.26567
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating23.6 US tons
Inventory rating18.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans8
Design loadHS 15
Structure length406 ft (123.7 m)
Longest span70 ft (21.3 m)
Deck width50 ft (15.3 m)
Roadway width43 ft (13.1 m)
Vertical clearance over deck15 ft (4.7 m)

Traffic and service

Average daily traffic23,359 (2022)
Projected traffic29,900 by 2042
Trucks3%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesHighway and waterway
Detour if closed4.3 mi (7 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$2.1 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Or 99W (hwy 91) SB over Marys River built?

It was built in 1949, making it 76 years old in 2025. It was reconstructed in 1992.

What condition is Or 99W (hwy 91) SB 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 April 2023.

How much traffic does Or 99W (hwy 91) SB over Marys River carry?

About 23,359 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is Or 99W (hwy 91) SB over Marys River?

The structure is 406 ft (123.7 m) long with a longest span of 70 ft (21.3 m) and a deck 50 ft wide.

Who owns Or 99W (hwy 91) SB over Marys River?

It is owned by the State Highway Agency.