US Bridges

Or 99W (hwy 91) over Miller Creek

Fair

Benton County, Oregon · 016 MI N Benton Lane CO L · Structure no. 20463 091 10272

Built
2008
17 years old
Condition
Fair
inspected April 2023
Type
Slab
Prestressed Concrete
Length
105 ft
2 main spans
Daily traffic
6,255
2022 count
Owner
State
State Highway Agency

About this bridge

Or 99W (hwy 91) over Miller Creek is a prestressed concrete slab carrying Or 99W (hwy 91) over Miller Creek in Benton County, Oregon. It was built in 2008, so it is 17 years old, younger 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 6,255 vehicles a day, roughly 17% of them trucks, projected to reach 6,400 by 2042. The structure is 105 ft (32 m) long and 52 ft wide. If it were closed, the detour would be 7.5 mi (12 km).

Location

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CarriesOr 99W (hwy 91)
CrossesMiller Creek
Location016 MI N Benton Lane CO L
RouteState Highway 99
CountyBenton County
StateOregon
Coordinates44.30059, -123.27138
Functional classRural Minor 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.3 US tons
Inventory rating45.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHL 93
Structure length105 ft (32 m)
Longest span52 ft (16 m)
Deck width52 ft (15.8 m)
Roadway width45 ft (13.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,255 (2022)
Projected traffic6,400 by 2042
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed7.5 mi (12 km)
TollOn a free road
National Highway SystemNo

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 Miller Creek built?

It was built in 2008, making it 17 years old in 2025.

What condition is Or 99W (hwy 91) over Miller Creek 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) over Miller Creek carry?

About 6,255 vehicles per day (2022 count), of which roughly 17% are trucks.

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

The structure is 105 ft (32 m) long with a longest span of 52 ft (16 m) and a deck 52 ft wide.

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

It is owned by the State Highway Agency.