US Bridges

SR 129 over Grande Ronde River

Fair

Asotin County, Washington · 4.4 N Oregon · Structure no. 0002672A0000000

Built
1941
84 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
283 ft
3 main spans
Daily traffic
290
2023 count
Owner
State
State Highway Agency

About this bridge

SR 129 over Grande Ronde River is a steel continuous stringer/multi-beam or girder carrying SR 129 over Grande Ronde River in Asotin County, Washington. It was built in 1941, so it is 84 years old, older than the Washington average of 49.8 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 290 vehicles a day, roughly 22% of them trucks, projected to reach 310 by 2039. The structure is 283 ft (86.3 m) long and 29 ft wide. If it were closed, the detour would be 39.8 mi (64 km).

Location

Open in Google Maps
CarriesSR 129
CrossesGrande Ronde River
Location4.4 N Oregon
RouteState Highway 129
CountyAsotin County
StateWashington
Coordinates46.04147, -117.25303
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating53 US tons
Inventory rating32 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadH 15
Structure length283 ft (86.3 m)
Longest span115 ft (35.1 m)
Deck width29 ft (8.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic290 (2023)
Projected traffic310 by 2039
Trucks22%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed39.8 mi (64 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$3.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 129 over Grande Ronde River built?

It was built in 1941, making it 84 years old in 2025.

What condition is SR 129 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 2023.

How much traffic does SR 129 over Grande Ronde River carry?

About 290 vehicles per day (2023 count), of which roughly 22% are trucks.

How long is SR 129 over Grande Ronde River?

The structure is 283 ft (86.3 m) long with a longest span of 115 ft (35.1 m) and a deck 29 ft wide.

Who owns SR 129 over Grande Ronde River?

It is owned by the State Highway Agency.