Or 99W (hwy 91) NB over Marys River
FairBenton County, Oregon · In Corvallis · Structure no. 00706 01W 08414
- Built
- 1933
- 92 years old, rebuilt 1997
- Condition
- Fair
- inspected April 2023
- Type
- Truss - Thru
- Steel
- Length
- 308 ft
- 1 main span
- Daily traffic
- 11,781
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
Or 99W (hwy 91) NB over Marys River is a steel truss - thru carrying Or 99W (hwy 91) NB over Marys River in Benton County, Oregon. It was built in 1933 and reconstructed in 1997, so it is 92 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 11,781 vehicles a day, roughly 2% of them trucks, projected to reach 14,800 by 2042. The structure is 308 ft (93.8 m) long and 40 ft wide. If it were closed, the detour would be 4.3 mi (7 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Or 99W (hwy 91) NB over Marys River built?
It was built in 1933, making it 92 years old in 2025. It was reconstructed in 1997.
What condition is Or 99W (hwy 91) NB 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) NB over Marys River carry?
About 11,781 vehicles per day (2022 count), of which roughly 2% are trucks.
How long is Or 99W (hwy 91) NB over Marys River?
The structure is 308 ft (93.8 m) long with a longest span of 150 ft (45.7 m) and a deck 40 ft wide.
Who owns Or 99W (hwy 91) NB over Marys River?
It is owned by the State Highway Agency.