US Bridges

Or 99W (hwy 91) over Jackson Creek

GoodPosted for load

Benton County, Oregon · 004 MI N Corvallis · Structure no. 00420A01W 07997

Built
1919
106 years old, rebuilt 1942
Condition
Good
inspected April 2023
Type
Slab
Concrete Continuous
Length
28 ft
2 main spans
Daily traffic
15,894
2022 count
Owner
State
State Highway Agency

About this bridge

Or 99W (hwy 91) over Jackson Creek is a concrete continuous slab carrying Or 99W (hwy 91) over Jackson Creek in Benton County, Oregon. It was built in 1919 and reconstructed in 1942, so it is 106 years old, older than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. Its operating status is: posted for other load-capacity restriction.

It carries about 15,894 vehicles a day, roughly 3% of them trucks, projected to reach 19,700 by 2042. The structure is 28 ft (8.5 m) long and 40 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

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CarriesOr 99W (hwy 91)
CrossesJackson Creek
Location004 MI N Corvallis
RouteState Highway 99
CountyBenton County
StateOregon
Coordinates44.61406, -123.24466
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31.3 US tons
Inventory rating24.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length28 ft (8.5 m)
Longest span14 ft (4.3 m)
Deck width40 ft (12.2 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,894 (2022)
Projected traffic19,700 by 2042
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18 mi (29 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 Or 99W (hwy 91) over Jackson Creek built?

It was built in 1919, making it 106 years old in 2025. It was reconstructed in 1942.

What condition is Or 99W (hwy 91) over Jackson Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2023.

How much traffic does Or 99W (hwy 91) over Jackson Creek carry?

About 15,894 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is Or 99W (hwy 91) over Jackson Creek?

The structure is 28 ft (8.5 m) long with a longest span of 14 ft (4.3 m) and a deck 40 ft wide.

Who owns Or 99W (hwy 91) over Jackson Creek?

It is owned by the State Highway Agency.