US Bridges

Or 99W (hwy 91) over Luckiamute River Oflow

Fair

Polk County, Oregon · 050 MI S Monmouth · Structure no. 06654A01W 06846

Built
1958
67 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Concrete Continuous
Length
308 ft
11 main spans
Daily traffic
9,582
2022 count
Owner
State
State Highway Agency

About this bridge

Or 99W (hwy 91) over Luckiamute River Oflow is a concrete continuous stringer/multi-beam or girder carrying Or 99W (hwy 91) over Luckiamute River Oflow in Polk County, Oregon. It was built in 1958, so it is 67 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 9,582 vehicles a day, roughly 6% of them trucks, projected to reach 10,000 by 2042. The structure is 308 ft (93.9 m) long and 35 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesOr 99W (hwy 91)
CrossesLuckiamute River Oflow
Location050 MI S Monmouth
RouteState Highway 99
CountyPolk County
StateOregon
Coordinates44.77588, -123.22906
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being 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 rating39.7 US tons
Inventory rating30.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans11
Design loadHS 20
Structure length308 ft (93.9 m)
Longest span28 ft (8.5 m)
Deck width35 ft (10.6 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,582 (2022)
Projected traffic10,000 by 2042
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 Luckiamute River Oflow built?

It was built in 1958, making it 67 years old in 2025.

What condition is Or 99W (hwy 91) over Luckiamute River Oflow 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 Luckiamute River Oflow carry?

About 9,582 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is Or 99W (hwy 91) over Luckiamute River Oflow?

The structure is 308 ft (93.9 m) long with a longest span of 28 ft (8.5 m) and a deck 35 ft wide.

Who owns Or 99W (hwy 91) over Luckiamute River Oflow?

It is owned by the State Highway Agency.