US Bridges

YOUNG/6170 over Union Flat Creek

Fair

Whitman County, Washington · 0.26 MI S Union Flat Crk · Structure no. 083535000000000

Built
1966
59 years old
Condition
Fair
inspected October 2024
Type
Tee Beam
Prestressed Concrete
Length
65 ft
1 main span
Daily traffic
62
2020 count
Owner
County
County Highway Agency

About this bridge

YOUNG/6170 over Union Flat Creek is a prestressed concrete tee beam carrying YOUNG/6170 over Union Flat Creek in Whitman County, Washington. It was built in 1966, so it is 59 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 62 vehicles a day, roughly 25% of them trucks, projected to reach 63 by 2039. The structure is 65 ft (19.8 m) long and 24 ft wide. If it were closed, the detour would be 26.1 mi (42 km).

Location

Open in Google Maps
CarriesYOUNG/6170
CrossesUnion Flat Creek
Location0.26 MI S Union Flat Crk
RouteCounty Highway 61700
CountyWhitman County
StateWashington
Coordinates46.84452, -117.62388
Functional classRural Minor Collector

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40.3 US tons
Inventory rating31.1 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadH 20
Structure length65 ft (19.8 m)
Longest span64 ft (19.5 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic62 (2020)
Projected traffic63 by 2039
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.1 mi (42 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$2.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was YOUNG/6170 over Union Flat Creek built?

It was built in 1966, making it 59 years old in 2025.

What condition is YOUNG/6170 over Union Flat Creek 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 October 2024.

How much traffic does YOUNG/6170 over Union Flat Creek carry?

About 62 vehicles per day (2020 count), of which roughly 25% are trucks.

How long is YOUNG/6170 over Union Flat Creek?

The structure is 65 ft (19.8 m) long with a longest span of 64 ft (19.5 m) and a deck 24 ft wide.

Who owns YOUNG/6170 over Union Flat Creek?

It is owned by the County Highway Agency.