US Bridges

Old Milton HWY over Walla Walla River

GoodPosted for load

Walla Walla County, Washington · 01.28N Stateline RD · Structure no. 081254000000000

Built
1975
50 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
139 ft
3 main spans
Daily traffic
1,795
2020 count
Owner
County
County Highway Agency

About this bridge

Old Milton HWY over Walla Walla River is a prestressed concrete continuous stringer/multi-beam or girder carrying Old Milton HWY over Walla Walla River in Walla Walla County, Washington. It was built in 1975, so it is 50 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. Its operating status is: posted for load restriction.

It carries about 1,795 vehicles a day, roughly 16% of them trucks, projected to reach 2,668 by 2040. The structure is 139 ft (42.5 m) long and 37 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesOld Milton HWY
CrossesWalla Walla River
Location01.28N Stateline RD
RouteCounty Highway 92570
Coordinates46.01678, -118.39939
Functional classRural Major Collector

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 inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation4: Meets minimum tolerable limits to be 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 alignment8: Equal to present desirable criteria
Operating rating39.2 US tons
Inventory rating19 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length139 ft (42.5 m)
Longest span119 ft (36.3 m)
Deck width37 ft (11.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,795 (2020)
Projected traffic2,668 by 2040
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$5.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Old Milton HWY over Walla Walla River built?

It was built in 1975, making it 50 years old in 2025.

What condition is Old Milton HWY over Walla Walla 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 September 2023.

How much traffic does Old Milton HWY over Walla Walla River carry?

About 1,795 vehicles per day (2020 count), of which roughly 16% are trucks.

How long is Old Milton HWY over Walla Walla River?

The structure is 139 ft (42.5 m) long with a longest span of 119 ft (36.3 m) and a deck 37 ft wide.

Who owns Old Milton HWY over Walla Walla River?

It is owned by the County Highway Agency.