US Bridges

Grande Ronde Road over Grande Ronde River

Fair

Union County, Oregon · Wallowa-Whitman Natl Fors · Structure no. 61C43 000000

Built
1964
61 years old
Condition
Fair
inspected September 2024
Type
Slab
Concrete Continuous
Length
111 ft
3 main spans
Daily traffic
168
2020 count
Owner
County
County Highway Agency

About this bridge

Grande Ronde Road over Grande Ronde River is a concrete continuous slab carrying Grande Ronde Road over Grande Ronde River in Union County, Oregon. It was built in 1964, so it is 61 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 168 vehicles a day, projected to reach 183 by 2025. The structure is 111 ft (33.8 m) long and 30 ft wide.

Location

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CarriesGrande Ronde Road
CrossesGrande Ronde River
LocationWallowa-Whitman Natl Fors
RouteCounty Highway 0
CountyUnion County
StateOregon
Coordinates45.26192, -118.37911
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating50 US tons
Inventory rating30 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckWood or timber
Main spans3
Design loadHS 20
Structure length111 ft (33.8 m)
Longest span45 ft (13.7 m)
Deck width30 ft (9.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic168 (2020)
Projected traffic183 by 2025
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Grande Ronde Road over Grande Ronde River built?

It was built in 1964, making it 61 years old in 2025.

What condition is Grande Ronde Road over Grande Ronde 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 September 2024.

How much traffic does Grande Ronde Road over Grande Ronde River carry?

About 168 vehicles per day (2020 count).

How long is Grande Ronde Road over Grande Ronde River?

The structure is 111 ft (33.8 m) long with a longest span of 45 ft (13.7 m) and a deck 30 ft wide.

Who owns Grande Ronde Road over Grande Ronde River?

It is owned by the County Highway Agency.