US Bridges

Twin Bridges Road over Yakima River

Good

Benton County, Washington · 475 NE of Harrington RD · Structure no. 086723000000000

Built
1997
28 years old
Condition
Good
inspected June 2023
Type
Tee Beam
Prestressed Concrete Continuous
Length
450 ft
4 main spans
Daily traffic
2,465
2016 count
Owner
County
County Highway Agency

About this bridge

Twin Bridges Road over Yakima River is a prestressed concrete continuous tee beam carrying Twin Bridges Road over Yakima River in Benton County, Washington. It was built in 1997, so it is 28 years old, younger 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 2,465 vehicles a day, roughly 30% of them trucks, projected to reach 2,800 by 2040. The structure is 450 ft (137.2 m) long and 38 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

CarriesTwin Bridges Road
CrossesYakima River
Location475 NE of Harrington RD
RouteCounty Highway 51800
Coordinates46.3238, -119.37309
Functional classUrban 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 inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating65.7 US tons
Inventory rating39.2 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 25 or greater
Structure length450 ft (137.2 m)
Longest span115 ft (35.1 m)
Deck width38 ft (11.6 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,465 (2016)
Projected traffic2,800 by 2040
Trucks30%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Twin Bridges Road over Yakima River built?

It was built in 1997, making it 28 years old in 2025.

What condition is Twin Bridges Road over Yakima 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 June 2023.

How much traffic does Twin Bridges Road over Yakima River carry?

About 2,465 vehicles per day (2016 count), of which roughly 30% are trucks.

How long is Twin Bridges Road over Yakima River?

The structure is 450 ft (137.2 m) long with a longest span of 115 ft (35.1 m) and a deck 38 ft wide.

Who owns Twin Bridges Road over Yakima River?

It is owned by the County Highway Agency.