US Bridges

I-84 (hwy 6) WB over Grande Ronde River

Good

Union County, Oregon · 12.2 MI SE Umatilla CO LN · Structure no. 19866 006 25618

Built
2005
20 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
436 ft
2 main spans
Daily traffic
6,269
2022 count
Owner
State
State Highway Agency

About this bridge

I-84 (hwy 6) WB over Grande Ronde River is a steel continuous stringer/multi-beam or girder carrying I-84 (hwy 6) WB over Grande Ronde River in Union County, Oregon. It was built in 2005, so it is 20 years old, younger 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.

It carries about 6,269 vehicles a day, roughly 38% of them trucks, projected to reach 6,850 by 2042. The structure is 436 ft (132.9 m) long and 51 ft wide. If it were closed, the detour would be 42.9 mi (69 km).

Location

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CarriesI-84 (hwy 6) WB
CrossesGrande Ronde River
Location12.2 MI SE Umatilla CO LN
RouteInterstate 84
CountyUnion County
StateOregon
Coordinates45.35228, -118.17215
Functional classRural Principal Arterial - Interstate

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
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 rating33.2 US tons
Inventory rating25.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length436 ft (132.9 m)
Longest span254 ft (77.3 m)
Deck width51 ft (15.5 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic6,269 (2022)
Projected traffic6,850 by 2042
Trucks38%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed42.9 mi (69 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-84 (hwy 6) WB over Grande Ronde River built?

It was built in 2005, making it 20 years old in 2025.

What condition is I-84 (hwy 6) WB over Grande Ronde River 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 May 2024.

How much traffic does I-84 (hwy 6) WB over Grande Ronde River carry?

About 6,269 vehicles per day (2022 count), of which roughly 38% are trucks.

How long is I-84 (hwy 6) WB over Grande Ronde River?

The structure is 436 ft (132.9 m) long with a longest span of 254 ft (77.3 m) and a deck 51 ft wide.

Who owns I-84 (hwy 6) WB over Grande Ronde River?

It is owned by the State Highway Agency.