US Bridges

Stephenson Rd. over Agency Creek

Good

Yakima County, Washington · 0.21 S. of W. Stephenson · Structure no. 086507000000000

Built
1998
27 years old
Condition
Good
inspected December 2022
Type
Stringer/Multi-beam or Girder
Concrete
Length
34 ft
1 main span
Daily traffic
525
2020 count
Owner
County
County Highway Agency

About this bridge

Stephenson Rd. over Agency Creek is a concrete stringer/multi-beam or girder carrying Stephenson Rd. over Agency Creek in Yakima County, Washington. It was built in 1998, so it is 27 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 525 vehicles a day, roughly 5% of them trucks, projected to reach 600 by 2040. The structure is 34 ft (10.4 m) long and 34 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesStephenson Rd.
CrossesAgency Creek
Location0.21 S. of W. Stephenson
RouteCounty Highway 55900
Coordinates46.39022, -120.69131
Functional classRural Local

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 inspectionDecember 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.1 US tons
Inventory rating32.5 US tons

Structure

MaterialConcrete
DeckOther
Main spans1
Design loadH 20
Structure length34 ft (10.4 m)
Longest span32 ft (9.8 m)
Deck width34 ft (10.4 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic525 (2020)
Projected traffic600 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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$1.6 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Stephenson Rd. over Agency Creek built?

It was built in 1998, making it 27 years old in 2025.

What condition is Stephenson Rd. over Agency 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 December 2022.

How much traffic does Stephenson Rd. over Agency Creek carry?

About 525 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Stephenson Rd. over Agency Creek?

The structure is 34 ft (10.4 m) long with a longest span of 32 ft (9.8 m) and a deck 34 ft wide.

Who owns Stephenson Rd. over Agency Creek?

It is owned by the County Highway Agency.