US Bridges

SR 129 over Asotin Creek

Good

Asotin County, Washington · 36.7 N Oregon · Structure no. 0005323A0000000

Built
1956
69 years old
Condition
Good
inspected June 2024
Type
Slab
Concrete Continuous
Length
110 ft
3 main spans
Daily traffic
4,450
2023 count
Owner
State
State Highway Agency

About this bridge

SR 129 over Asotin Creek is a concrete continuous slab carrying SR 129 over Asotin Creek in Asotin County, Washington. It was built in 1956, so it is 69 years old, older than the Washington average of 49.8 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 4,450 vehicles a day, roughly 5% of them trucks, projected to reach 5,710 by 2039. The structure is 110 ft (33.5 m) long and 38 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSR 129
CrossesAsotin Creek
Location36.7 N Oregon
RouteState Highway 129
Coordinates46.3415, -117.05539
Functional classUrban Minor Arterial

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.8 US tons
Inventory rating20.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length110 ft (33.5 m)
Longest span44 ft (13.4 m)
Deck width38 ft (11.6 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,450 (2023)
Projected traffic5,710 by 2039
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 129 over Asotin Creek built?

It was built in 1956, making it 69 years old in 2025.

What condition is SR 129 over Asotin Creek 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 June 2024.

How much traffic does SR 129 over Asotin Creek carry?

About 4,450 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is SR 129 over Asotin Creek?

The structure is 110 ft (33.5 m) long with a longest span of 44 ft (13.4 m) and a deck 38 ft wide.

Who owns SR 129 over Asotin Creek?

It is owned by the State Highway Agency.